Airxcel Aqua-Hot GEN1 Series User manual

Use and Care Guide
GEN1Series
GEN-1 DIESEL

©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
Thank you for equipping your RV, coach, or caravan with an Aqua-Hot hydronic heating
system! We deeply value your business and we are grateful for the trust you have placed with
Aqua-Hot Heating Systems, LLC. Our customers are our top priority and we are committed to
providing best-in-class products, service, and support.
We understand how important comfort is to you as a recreational vehicle or manufactured
home owner; therefore, we have designed a heating system to signicantly improve all of your
comfort levels. Additionally, the Aqua-Hot hydronic heating system is a low-emissions, fuel
efcient system that adds thousands of dollars in value to your RV or home.
We know that you must be eager to get underway, but take time to read and understand this
Use and Care Guide to understand the basic functionality of the Aqua-Hot. This guide should
be maintained in legible condition and kept in a safe, accessible location for future reference.
Should you have any suggestions on how we can better serve you, please do not hesitate
to contact us.
Technical Support can be contacted at 574-AIR-XCEL (574-247-9235) . Hours of operation
are 7:00am to 4:00pm (MST) Monday through Friday.
The Aqua-Hot heating system is protected by the nest warranty in the industry (read about
it at the back of this manual).
Important Notes:
• A qualied installer or service technician must perform equipment installation or service.
Contact Aqua-Hot for Factory Authorized Service Centers or Certied technicians located
near you at www.aquahot.com/service-help, or call us at 574-AIR-XCEL (574-247-9235) .
• Warranty work must be performed by an Aqua-Hot Factory Authorized Service Center.
• Your on-product identity label contains the specications of your unit. Factory settings may
be adjusted by the vehicle manufacturer, conrm nal setting with your dealer.
• Follow this guide exactly. Failure to do so may result in a re or explosion resulting in
property damage and/or personal injury.
Journey in Comfort
p. 1

Introduction
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 2
Contents
Caution Notes.......................................................2
Safety Features ....................................................3
Component Call-outs ...........................................5
System Features ..................................................6
Operational Overview...........................................7
Operating the LCD................................................8
Aqua-Hot Layout ...................................................14
Maintenance & Storage.......................................15
Winterizing the Aqua-Hot .....................................16
General Troubleshooting......................................17
Owner’s Service Log ............................................18
Warranty ...............................................................20
THE AQUA-HOT’s EXHAUST IS HOT!
• Do NOT operate the burner inside an enclosed building.
• The heater must be switched OFF when refueling.
• The heater is not to be operated while the vehicle is being
refueled, if the towing vehicle is being refueled, if the vehicle
is in motion, or if the vehicle is in an enclosed space.
• The heater is not to be used while the any appliances are
being refueled or serviced.
• Aqua-Hot will not be liable for problems and/or damage
caused by the system installed by untrained technicians.
Caution Notes
As you read this information, take particular note of the NOTICE,
CAUTION, WARNING, and DANGER symbols when they appear.
This information is important for safe and efcient use of the
Aqua-Hot system.
NOTICE signals a situation where potential damage to the
Aqua-Hot could occur.
CAUTION signals a situation where potential harm or risk of
minor or moderate injury could occur if you do not follow
instructions.
WARNING signals a hazardous situation where potential harm,
risk of serious injury, or death could result if instructions are not
followed.
DANGER signals a situation where immediate risk of serious
injury or death will result if instructions are not followed.
NOTE: This manual will also use notes sections similar to
this one to draw attention to features and practices which
must be observed.
Water temperature over 125°F can cause
severe burns instantly, or death from scalds.
Children, disabled, and elderly are at highest
risk of being scalded. See instruction manual
before setting temperature at water heater.
Feel water before bathing or showering!
Temperature limiting valves are available.
WHAT TO DO IF YOU SMELL GAS
• Evacuate all persons from the vehicle.
• Shut off the gas supply at the gas container or source.
• Do not touch any electrical switch or use any phone or radio
in the vehicle.
• Do not start the vehicle’s engine or electric generator.
• Contact the nearest gas supplier or qualied service technician
for repairs.
• If you cannot reach a gas supplier or qualied service
technician, contact the nearest re department.
• Do NOT run the rst operation until it has been conrmed
there are no gas leaks.
• Do not turn on the gas supply until the gas leak(s) have been
repaired.

Safety Instructions
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 3
Read and understand all instructions before using the Aqua-
Hot system. Aqua-Hot Heating Systems is not liable for damage
resulting from failing to follow instructions contained in this,
and any other Aqua-Hot documentation relevant to this unit.
• Read this manual before using the Aqua-Hot System
to reduce the risk of injury to persons or damage to the
equipment.
• The product identity label contains specications of the
unit, to what standards it has been tested, and important
safety notices.
• Disconnect electric wiring to the Aqua-Hot System before
welding or plasma cutting the RV to avoid damage to the
electrical components.
• The GEN-1 tank
must have a cold water inlet pressure
regulator set to 45PSI or below to avoid damage to the tank.
• Use caution when working on or near any propane system.
• DO NOT connect the 12-volt DC power to the Aqua-Hot if the
vehicle requires welding.
• Use special caution when children are present. Children
must not be allowed to play with the heater or perform
cleaning and maintenance.
• At maximum operating temperature, the hot air outlet
could be very hot that may result in serious burns or injury.
Be aware of hot surfaces.
• The burner produces very hot temperatures that can ignite
surrounding ammable materials. The burner should be
turned off when loading or unloading ammable materials.
If the information in this manual is not followed
exactly, a re or explosion may result, causing
property damage, personal injury or death.
In order to avoid overheating, do NOT cover
the heater.
System Overview
The Aqua-Hot Gen-1 Heater is a Heating System that can
provide interior heat and hot water using a built-in electric
heating element and a diesel burner. The heater can be used
while driving.
There are three options for heating:
• Diesel Mode: the heater automatically adjusts power
according to temperatures.
• Electric Mode: manually select either the 900W or
1800W heating ode according to the power supply
capacity of the shore power.
• Hybrid Mode: the system will control the use of electric
and diesel heating based on the power demand on the
system.
Important Notes:
• A qualied installer or service technician must perform
equipment installation or service.
• Installation, repairs, and warranty work may only be carried
out by a qualied technician. The heating system must be
installed in accordance with local codes, or, in the absence
of local codes, follow ANSI/NFPA 1192.
• Aqua-Hot will not be liable for problems or damage caused
by the system being installed by unqualied technicians.
• This heating system has been certied for installation only
in recreational vehicles as a Class I Appliance, not certied
for use in boats.
• The Aqua-Hot heating system operates independently of
the vehicle engine and is connected directly to the electrical
system of the vehicle or towable.
• Please read this manual and follow instructions to avoid
injuries during installation and/or operation.

Safety Instructions
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 4
Safe Operation
The Aqua-Hot Heating system consists of an electric
heating element and a diesel burner. The heater with
supplementary indirect water heating is for use in RVs
only to heat the space and domestic water.
The room heater works by pulling air into the heater by
a fan, heated up, and dispensed into the RV’s interior
by ductwork.
The water heating is installed between the fresh water
supply line and the hot water system.
Locate the LCD screen (shown below) inside the RV
(contact the vehicle manufacturer if unable to nd),
press and hold the turn knob to wake, use the rotary
button to select the desired fuel mode. Click the
rotary button to conrm. It will take approximately 20
minutes for the heater to get to operating temperature.
After the GEN1 is to temperature, you can activate
interior heat in your coach via the thermostat/LCD or
run hot water.
Intended Use
This manual explains the operation and care of the Aqua-Hot
heating system.
• Service and repairs may only be carried out by a qualied
technician.
• The vehicle owner is responsible for correct operation of
the appliance.
• All vehicle installations must comply with the requirements
listed in the Recreational Vehicle Industry Association’s
(RVIA) ANSI/NFPA 1192 Handbook for Recreational
Vehicle Standards.
• Make sure to properly drain winterize the Aqua-Hot’s water
tank when not in use and/or any time the heater is stored
where freezing temperatures may be experienced. The
Aqua-Hot warranty will not cover claims for freeze damage.
Please refer to page 10 for proper winterization of the
Aqua-Hot.
Figure 1
Intended Use
This manual explains the operation and care of the Aqua-Hot
heating system.
• Service and repairs may only be carried out by a qualied
technician.
• The vehicle owner is responsible for correct operation of
the appliance.
• All vehicle installations must comply with the requirements
listed in the Recreational Vehicle Industry Association’s
(RVIA) ANSI/NFPA 1192 Handbook for Recreational
Vehicle Standards.
• Make sure to properly drain winterize the Aqua-Hot’s water
tank when not in use and/or any time the heater is stored
where freezing temperatures may be experienced. The
Aqua-Hot warranty will not cover claims for freeze damage.
Please refer to page 10 for proper winterization of the
Aqua-Hot.

Component Callouts
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 5
Figure 4
Figure 3
Aqua-Hot GEN-1 Heater
1. Heater
2. Air Intake Inlet
3. Exhaust Outlet
4. Controller Cover
5. Plastic Frame Feet
6. Aluminum Frame Feet
7. Circulated Air Intake
8. Cold Water Connection (Inlet)
9. Diesel Fuel Connection
10. Hot Water Connection (Outlet)
11. Fan for Intake Air
12. Water Tank
13. Warm Air Outlets (Upper)
14. Warm Air Outlets (Lower)
15. Recessed Grips
16. Electronic Control Unit
17. LCD Control Screen
17
Figure 2
132
10
6
8
7
4
5
11
6
9
12
16
7
32
14
14
15
4
16 5
12
6
13
13

Aqua-Hot System Features
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 6
System Features
The Aqua-Hot Gen-1 Heater is a Heating System that can
provide interior heat and hot water using a built-in electric
heating element and a diesel burner. The heater can be used
while driving.
There are three options for heating:
• Diesel Mode: the heater automatically adjusts power
according to temperatures.
• Electric Mode: manually select either the 900W or
1800W heating ode according to the power supply
capacity of the shore power.
• Hybrid Mode: the system will control the use of electric
and diesel heating based on the power demand on the
system.
• When plugged into shore power, or powered by a generator,
the electric element lets you use the power you are already
paying for to provide heat in mild conditions and meet your
light duty hot water needs.
• The diesel burner can be utilized with the electric element
to heat and supplementary produce hot water.
All vehicle installations must comply with the requirements
listed in the Recreational Vehicle Industry Association’s
(RVIA) ANSI/NFPA 1192 Handbook for Recreational Vehicle
Standards.
NOTE: This product label is attached to the side of the Aqua-
Hot, and provides a ready reference to specications, test
standards, and important safety notices.
For full details and installation requirements,
please see installation and owners manuals.
Minimum Service Clearances:
Front: 4 inches
Back: 1 inch
Sides: 0.5 inches
Top: 2 inches
Bottom: No Clearance Necessary
This appliance must be installed in accordance with local codes, or in
absence of local codes, the Standard for Recreational Vehicles, ANSI
A119.2/NFPA 1192 or CAN/CSA-Z240 RV.
Listing 20L01
Meets or Exceeds:
UL 307A, UL174
CAN/CSA B140.0-06
CAN/CSA C22.2 No.110-94
Model: Gen 1
Serial Number:

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 7
Operational Overview
The heating features are powered by the DC diesel burner and/
or the AC electric element. These maintain the temperature of
the Aqua-Hot’s tank to provide supplementary hot water and
interior heat.
Diesel Burner & Electric:
The diesel burner is the Aqua-Hot’s primary and most
powerful heat source.
The electric element is the Aqua-Hot’s secondary heat
source and can be used when plugged into shore power.
These heat modes can be activated by turning them on by
selecting the fuel source (GAS/EL/MIX) on the LCD screen
shown to the right.
There are 4 modes: OFF, ECO, HOT, and BOOST. In ECO
mode, the heat mode will get the tank temperature to
104°F. In HOT mode, the heat mode will get the tank
to 140°F. In BOOST mode, the heater prioritizes water
heating for 40 minutes or until the water temperature
reaches 60°C (140°F).
The system uses temperature readings from the RV
interior thermistor. In OFF mode, the burner is off and will
not provide any heat to the interior or water.
Controlling Heat Levels with Room Thermostat:
When the Aqua-Hot is on and up to operating temperature,
adjust the room thermostat to the desired temperature and it
will automatically activate the Aqua-Hot’s heating functions to
maintain the desired interior temperature.
Different manufacturers may use different types of thermostats.
Please contact the dealer or manufacturer for the exact type,
location, and thermostat operation.
Operational Overview
Figure 6
Figure 5
Working Mode Energy Mode
OFF Water heating is off - icon will not show
ECO Water Temperature target of 104°F
HOT Water Temperature target of 140°F
BOOST
Prioritizes water heating for 40 minutes
or until the water temperature reaches
60°C (140°F)

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 8
Operating the LCD
Operating the LCD
Display and Control Section:
• The information is displayed on the screen with a back-light
• In the menu bar (#3, 4), the function of the LCD can be
selected. The operating parameters are shown on the
status bar (2) and display bar (5, 6).
• After the 110V is supplied to the system, the 110V power
supply indication column (5) displays the power supply sign
• During heater operation, set the parameter bar (7) to
display start/end times, and room temperature.
• Press the return button (9) to return to previous interface.
Rotary button (8)
• Select, modify, and save icons for menu bars 3 & 4 by
rotating the knob.
• Tap the button to conrm saving and return to main menu.
• Press and hold the button (+3seconds) to turn on/off LCD.
1
2
7
5
6
4
98
3
Power ON:
Hold the rotary button for 3seconds to turn on LCD. After a few
seconds, the time is displayed as 00:00.
Click the rotary button to display the initial options in the display.
Clock setting (current time setting)
• Click the rotary button to display the icon in the menu bar
(3).
• Use the rotary button to select “Set Clock” icon in the menu
bar (4).
• Click the rotary button to enter the clock settings.
• Use the rotary button to set the time.
“A--” is displayed in the morning and “P--” is displayed in
the afternoon
• Click the rotary button again to determine the time, then
the minute display ashes.
• Set the minute with the rotary button.
• Click the rotary button to conrm the value and exit the
clock setting.
• Rotate button to start
• Press the rotary button for 3 seconds, the LCD will start.
1Display Area
2Status Display
3Menu Bar (top)
4Menu Bar (bottom)
5110/220V Electrical Display
6Timing Display
7Parameter Setup Display
8Rotary Button/Knob
9Return Button

Activating the Aqua-Hot
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Operating the LCD
Shutdown
Press the rotary button for more than 3s at the initial interface
to shut down. When the LCD switch is turned off, the heating
process and any connected equipment are also automatically
turned off. The parameters before shutdown are retained.
Post-Purge Process (Cool-Down Cycle)
Since the heater has a higher residual heat after heating and a
post-cleaning need, the fan typically runs for a few minutes for
cooling.
Heating Function Settings
The heating function setting should rst set the fuel, and then
select water heating or room heating or simultaneous heating,
and nally set the fan speed. The default heating function
settings is the fuel setting and the fan speed setting ECO.
Fuel Setting
• Rotate the button to select the fuel icon in the menu bar
(3).
• Click on the selected icon.
• Use the rotary button to select the desired fuel mode.
• Click the rotary button to conrm.
If the fuel type is not selected, once the heater starts to operate
(room temperature, hot water icon is activated), the status bar
shows the type of fuel selected during the previous heating
process or the fuel type set at the factory.
Working Mode Fuel Mode
GAS LPG/Diesel/Gasoline
MIX 1 Electric 900W + GAS
MIX 2 Electric 1800W + GAS
EL 1 Electric 900W
EL 2 Electric 1800W
Adjustment of Interior Temperature
• Click the rotary button to display the icon in the menu bar
(3). Select the room temperature heating system with the
rotary button according to the connected device.
• Conrm the selection by clicking the rotary button on the
selected room temperature icon.
• Use the rotary button to select the desired temperature.
• Click the rotary button to conrm its value.
This ame icon will be on when room temperature heating
start, this icon will ash until the predetermined room
temperature is reached.
Adjustment of Water Heating
• Click the rotary button to display the icon in the menu bar.
• Use the rotary button to select the desired water
temperature setting level.
• Click the rotary button to conrm
Working Mode Energy Mode
OFF Water heating is off - icon will not show
ECO Water Temperature target of 40°C
HOT Water Temperature target of 60°C
BOOST
Prioritizes water heating for 40 minutes
or until the water temperature reaches
60°C
Temperature Display °C / °F
Temperature Range 5-30°C / 41-86°F
Increments 1° C/F

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 10
Operating the LCD
.This icon will ash until the predetermined water
temperature is reached.
In the "heating and hot water mode", the water temperature
of 40°C can only be stored for a limited time (room heating
priority).
Adjustment of Fan Speed (when air heating is enabled)
• Click the rotary button to display the icon in the menu bar.
• Use the rotary button to select the desired fan speed
setting level.
• Click the rotary button to conrm.
•
Adjustment of Vent Fan Speed
NOTE: Vent Fan is for air circulation without heating.
• Only available when air heating is not enabled
• Select OFF or VENT
• If VENT is selected, set the fan speed between 1-10.
Working Mode Energy Mode
OFF Fan is off - icon will not show
VENT Circulation ventilation. Can choose 10
levels of fan speed.
ECO Low fan speed
LOW Mid-speed
HIGH High fan speed
BOOST Fastest fan speed
Heating Start
After the setting is nished, press the return key or wait for 10s
to enter the clock interface, and the heating starts. The clock
and set temperature are displayed alternately.
Heating End
Press and hold the rotary button for 3 seconds to shut down.
Timing Heating Settings
• Click the rotary button to display the icon in the menu bar
(3).
• Click the rotary button to enter the timing settings.
If the vehicle is parked in a closed room:
• Turn off the fuel supply to the heater.
• Turn off the timer switch of the LCD switch.
• Turn off the heater on the LCD switch. Press and hold
the rotary button for 3 seconds to turn off.
Enter the Start-up Time
• Use the rotary button to set the start time.
• Click the rotary button to conrm and proceed to the next
setting.
DANGER OF TOXIC EXHAUST FUMES
Even if the vehicle is stopped, unmanned, the activated time switch
will turn on the heater. Exhaust gases from heaters may be toxic in
conned spaces such as garages, workshops, and repair shops.

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 11
Operating the LCD
Enter the End Time
• Use the rotary button to set the end time.
• Click the rotary button to conrm and proceed to the next
setting.
Set Room Temperature
• Use the rotary button to set the desired temperature
• Click the rotary button to conrm and proceed to the next
setting.
Set Water Temperature
• Use the rotary button to set the desired temperature
• Click the rotary button to conrm and proceed to the next
setting.
Fuel Mode Selection
• Use the rotary button to set the desired fuel mode
• Click the rotary button to conrm and proceed to the next
setting.
Select Fan Speed Level
• Use the rotary button to set the desired fan speed
• Click the rotary button to conrm and proceed to the next
setting.
Enable Timer
• Use the rotary button to select Enable Timing (ON). If OFF is
selected, the timer is canceled, but the settings are saved.
• Click the rotary button to conrm and proceed to the next
setting.
The time switch is only enabled once until it is disabled (turned
off) or powered down. If the timer switch is programmed and
enabled, the time switch icon is displayed in the status line
(2). The timing icon ashes if the time switch is enabled and
activated.
Cancel Timer
• With the timing set, use the rotary button to select the
timing setting. Click the rotary button to enter the settings.
• Use the rotary button to select the cancel timing (OFF).
If you select ON, continue to use timing. Click the rotary
button to conrm that the cancellation timing is valid. But
the previous settings are still saved
Parameter Settings
The content after the parameter setting is maintained after the
power is turned off. Use the rotary button to select the “Settings”
icon in the menu bar (4). Click the button to enter the settings.

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
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Operating the LCD
Voltage Inquiry
• Click the rotation button to display the voltage: 12.0V.
Air Pressure and Temperature Inquiry
• Click the rotation button to select the at ATMOS icon.
• Click the rotary button to enter the selection
• Use the rotary button to switch between atmospheric
pressure and ambient temperature.
Atmospheric pressure: 99KPa Ambient temperature: 89°F
Offset Setting
The external temperature sensor of the heater can be adjusted
separately depending on the installation of the sensor. The
offset setting can be in the range of -5°C to 5°C. The deviation
is 1°C.
• Click the rotation button to select the OFFSET icon.
• Click the rotary button to enter the selection
Switching Temperature Units
Use the knob to switch between Celsius and Fahrenheit, then
click to conrm
LCD Backlight Adjustment
The LCD backlight has 10 levels of incremental adjustment.
Use the rotary button to select the BRIGHT icon and click the
rotate button to enter the settings.
The brightness of the LCD changes as the rotary button rotates.
After conrming by clicking the rotary button, return to the
previous operation. The backlight brightness is set to 6 by
default.
Time Settings
Use the rotary button to select the time format setting icon
and click the rotary button to enter the settings. Use the rotary
button to select the 12h or 24h icon and click the rotary button
to conrm. The default setting is 24h.

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
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Operating the LCD
Fast Pump Settings
Select pump oil icon GoOil with rotary button.
• Click on the rotary button to enter the fast pump oil. The
default fast pump time is 90 seconds. The remaining time
can be adjusted with a knob.
• Press the return key or stop the fast pump if the pump oil
time exceeds the set value.
Software Version Number
• Use the rotary button to select the INDEX icon and click the
rotary button to enter the query item.
• Use the rotary button to view the information of the LCD
switch or the information of the main controller.
• Click the rotary button or want to go back to return to the
previous operation.
C5.100 - LCD Version H11.10 - Master Controller Version
Factory Settings
• The reset function resets the LCD switch to factory settings.
All previous settings will be deleted. All devices used before
RESET is installed and powered.
• Use the rotary button to select the RESET icon and click the
rotary button to display the factory setting PR SET.
• After conrming, the initialization “INIT.....” is displayed.
Fault Display
• Use the rotary button to select the icon and click the
rotary button to display the current warning code (for
troubleshooting, please refer to the relevant heater
instruction manual).
• There are faults in the fault that are automatically recovered
and manually recovered after repair.
• An automatic recovery fault is a warning fault in which
an operating parameter has exceeded a dened normal
working range and reached an undened state. In this case,
the device will continue to run and the warning symbol (！)
will be displayed in the menu bar (4) without warning code.
After the fault is repaired, the warning symbol disappears
automatically (it can also be manually restored), and the
device continues to work according to the original settings.
For example: warning fault code W 120 H.
• A manually recovered fault means that the fault code is
displayed in the parameter setting 8 eld (7) when the
fault occurs. The cause of the fault can be determined and
remedied by the help of the troubleshooting guide. The
fault code disappears after a few seconds, and the warning
disappears, and the warning symbol is displayed in the
menu bar (4).
• Select Reheat after the fault is identied and resolved, rst
remove the fault code. Press the rotary button to display the
fault code, then press the rotary button, the displayed fault
code disappears and return to the initial time interface.
Re-enter the heating parameters to initiate heating. If the
fault is removed, the heating will be normal or the fault will
occur again. The LCD switch will jump to the “Fault” menu
again, the warning symbol will be displayed again, and the
affected device will still be in the warning state. Since the
fault has not been eliminated, if you want to return to the
set level, press the back button (9). For example: fault code
E 31 H. Shutdown and power off can also eliminate faults.
The fault code table and troubleshooting methods can be found
in the tenth fault code table at the end of the manual.

Activating the Aqua-Hot
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
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Aqua-Hot Layout
Figure 7
64
4
4
1
3
2
4
5
6
4
4
4
1
3
2
4
5
1. LCD Control Screen
2. Aqua-Hot Heater
3. Recirculating Air Inlet
(min 175.25in2)
Heater Installation Layout (Towable)
4. Heat Outlet
5. Exhaust Vent Cap
6. Vehicle Water Tank
1. LCD Control Screen
2. Aqua-Hot Heater
3. Recirculating Air Inlet
(min 175.25in2)
Heater Installation Layout (RV)
4. Heat Outlet
5. Exhaust Vent Cap
6. Vehicle Water Tank
NOTE: The illustrations below are just samples for the layout of the Aqua-Hot heating system. Actual placement may vary on the
individual design of the RV. For questions or assistance, contact us at 574-AIR-XCEL (574-247-9235).

Maintenance
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 15
DO NOT operate the diesel burner and/or electric
heating element in an enclosed space such as a
garage, shop, or while refueling.
Maintenance & Storage
It is recommended to have the following service done once a
year:
• Replace the fuel lter
• Check the air ducting, air intake and exhaust outlet for
blockages or damage
• Check for damage or breaks in the fuel lines and wiring.
If the system has not been used for long periods of time,
thoroughly ush all hot/cold water lines before use. It is
recommended to run the heater at least once a month for 10-
20 minutes to ensure optimum heater condition.
The water tanks must be cleaned regularly, minimum of twice
a year. When the RV is driving or in storage, the temperature
range should not fall below -40°F or rise above +185°F to
prevent damage to the electronic components.
THE AQUA-HOT’s EXHAUST IS HOT!
• Do NOT operate the burner inside an enclosed building.
• The heater must be switched OFF when refueling.
• The heater is not to be operated while the vehicle is being
refueled, if the towing vehicle is being refueled, if the vehicle
is in motion, or if the vehicle is in an enclosed space.
• The heater is not to be used while any appliances are being
refueled or serviced.
• Aqua-Hot will not be liable for problems and/or damage
caused by the system installed by untrained technicians.
If the vehicle is parked in a closed room:
• Turn off the fuel supply to the heater.
• Turn off the timer switch of the LCD switch.
• Turn off the heater on the LCD switch. Press and hold
the rotary button for 3 seconds to turn off (see below).
Rotary Button /
Turn Knob
Press and hold for 3
seconds to turn off
Figure 8
If the information in this manual is not followed
exactly, a re or explosion may result, causing
property damage, personal injury or death.
The heating system can produce dangerous CO gas
when the fuel system is operating if not properly
installed or operated. Read all safety instructions
before install or use.

Winterization
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 16
Not winterizing the Aqua-Hot when freezing
temperatures are present will result in serious damage
to the Aqua-Hot domestic water heating system. The
warranty does not cover freeze damage.
Winterization
To avoid freeze damage to the system, the heater must be
drained through the drain valve completely. If water is left in
the system in below freezing temperatures, it can cause severe
damage to the system that is not covered under warranty.
• Turn off power supply and open hot water faucets in the RV.
• Place a container under the drain valve to catch the water.
• Open the drain valve and allow the water to drain out
completely.
It is recommended to winterize if the RV will be stored for a long
time or the system will not be used, and it is below freezing.
Disinfecting the Domestic Water System
The Aqua-Hot Heating components are not compatible to
prolonged exposure to sodium hypochlorite (bleach or liquid
bleach). Using products containing bleach, including water
refreshers, may cause corrosion of the domestic water lines,
resulting in a catastrophic failure of the Aqua-Hot system by
creating leaks that cannot be repaired. This damage is not
covered by the Aqua-Hot warranty.
If disinfecting the hot water system, be sure to follow any current
national regulations or any other applicable local standards for
Water Systems.
Figure 9
Water temperature over 125°F can cause severe burns instantly,
or death from scalds. Water temperature coming from the
heater will be at 160°F. Feel water before bathing or showering!
Temperature limiting valves are available.
9
11
12
4
1
7
36
8
10
25
SINK
SHOWER
NOTE: This diagram is just a sample
for the layout of the hot water system.
Actual placement may vary on the
individual design of the RV.
1. Pressure Relief Valve
2. Cold Water Inlet
3. Hot Water Outlet
4. Drain Valve
5. Tempering Valve
6. Non-Return Check Valve
Domestic Hot Water Installation Layout
7. Domestic Water Lines
8. Pressure Regulator
9. City Water Hook-Up
10. Water Tank Connection
11. Water Pump
12. Fresh Water Tank

Use and Operation
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 17
General Troubleshooting
Troubleshooting
• Ensure that the system is supplied with electrical power and there are no blown fuses.
• Ensure that there is at least ¼ tank of fuel in the vehicle fuel supply and the fuel lter is not clogged.
• Make sure all the electrical and plumbing connections are connected and secure.
• Ensure there are no faults on the LCD. If there are, determine the fault and remedy. Refer to the table below for the fault code.
Fault Codes
Error
Code Fault Name Remedy
10 Over-voltage Check vehicle power supply
11 Low Voltage Check vehicle power supply
21
Warm air outlet
temperature sensor
disconnect
Check temperature sensor connections
22
Warm air outlet
temperature sensor
short circuit
Check temperature sensor wiring
23 Water temperature
sensor disconnect Check temperature sensor connections
24 Water Temperature
sensor short circuit Check temperature sensor wiring
25
External
temperature sensor
disconnect
Check temperature sensor connections
26
External
Temperature sensor
short circuit
Check temperature sensor wiring
27
Combustion support
temperature sensor
disconnect Check temperature sensor connections
28
Combustion support
temperature sensor
disconnect Check temperature sensor wiring
31 Combustion Failure
• Check gas supply system
• Check combustion inlet and outlet
are blocked
• Check ignition coil, electrode
• Flame sensor
32 Combustion failure
• Check gas supply system
• Check combustion inlet and outlet
are blocked
• Check Flame sensor
33 Flame sensor fault • Check ame sensor lead wire
• Check ame sensor
41 Warm air outlet
overheats Check air outlet for blockages
42 Warm air overheat
switch protection
• Check whether air outlet is blocked
• Check warm air overheat switch
Error
Code Fault Name Remedy
43 Water overheat
• Check water tank levels
• Check sensor wiring/connections
• Check air outlet for blockages
44 Warm air overheat
switch protection
• Check air outlet for blockages
• Check warm air overheat switch
45 Overheat fault
• Check air outlet for blockages
• Check water temperature sensor
• Check warm air sensor
51 Communication
fault Check interconnecting cable
61 Fuel Pump Break
• Check fuel pump lead for damage
• Check fuel pump wire connections
• Replace fuel pump
• Replace controller
62 Fuel pump short
circuit
• Check fuel pump lead for damage
• Check fuel pump wire connections
• Replace fuel pump
• Replace controller
63 Electric element
circuit broken
• Check power supply voltage
• Check resistance at room temp
(0.2/12V)
• Clean any carbon build-up
• Replace controller
65 No power to electric
element Replace controller
81 Combustion fan
disconnect Check combustion air blower
82 Combustion blower
boot failure
• Check blower motor lead wire
• Check combustion air blower
83 Combustion blower
speed too low Check combustion air blower motor
84 Warm air blower
motor disconnect Check warm air blower motor
85 Warm air blower
motor boot failure
• Check blower motor lead wire
• Check warm air blower motor
86 Warm air blower
speed too low Check warm air blower motor
110 Window alarm Check window switch cable
120 Low Voltage Fault Check power supply and connections
220 220V Disconnect Check AC 220V/110V power supply
Heater Lock-out Reset Procedure
To reset the heater from a lock-out, simply turn off the heater and disconnect power supply to the heater, wait for 20 seconds,
then reconnect power supply and restart the system.

Service Log
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 18
DATE SERVICE PERFORMED SERVICE CENTER

Service Log
©Aqua-Hot® GEN1 Diesel Use and Care Guide REV 230313
p. 19
DATE SERVICE PERFORMED SERVICE CENTER