Truma CP plus User manual

Operating instructions
To be kept in the vehicle.
This document is part of the product.
Truma CP plus

2
Table of contents
Consumer Safety Information
Safety symbols and signal words ............................................. 3
Safety Behavior and Practices .................................................. 3
Intended use .......................................................................... 3
Important notes ..................................................................... 3
Operating Instructions
Display and Operating Elements ........................................ 4
Description ............................................................................... 4
Rotary push button ................................................................... 4
Initial start-up ........................................................................... 4
Start-up ..................................................................................... 5
Functions .................................................................................. 5
Switch on / off .......................................................................... 5
Select the setting level ............................................................. 5
Change the room temperature ................................................. 5
Change hot water mode .......................................................... 6
Select energy mode ................................................................. 6
Select fan level ......................................................................... 7
Set time switch ......................................................................... 8
Set clock ................................................................................... 9
Service menu ............................................................................ 9
Warning / Error .................................................................... 11
Warning .................................................................................. 11
Special displays ................................................................... 12
External control panel (CI-BUS) .............................................. 12
Display power supply 120VAC ............................................. 12
IR remote control ................................................................ 12
Maintenance ........................................................................ 12
Technical data ...................................................................... 12
Troubleshooting charts ..................................................... 13
Truma Combi .......................................................................... 13
Truma Aventa eco / comfort ................................................... 15
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death or
property damage.
Do not store or use gasoline or other flamma-
ble vapors and liquids in the vicinity of this or
any other appliance.
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 certified
service technician for repairs.
• If you cannot reach a gas supplier or certi-
fied service technician, contact the nearest
fire department.
• Do not turn on the gas supply until gas
leaks have been repaired.
Installation and service must be performed by
a certified service technician, service agency,
or the gas supplier.
California Proposition 65 lists chemical sub-
stances known to the state to cause cancer,
birth defects, death, serious illness or other
reproductive harm. This product may contain
such substances.
4010007
Trademark information
Truma CP plus control panel referred to as
CPplus below.
Truma Combi referred to as Combi below.
Truma Combi D referred to as Combi D below.
Aventa eco and Aventa comfort referred to as
Aventa below.
Combi and Combi D are furnaces. For technical
reasons they are referred to as “HEATING” in
the display text.

3
Safety symbols and signal words
This is the safety alert symbol. This symbol
alerts you to potential hazards that can kill or
hurt you and others.
indicates a hazardous situation
which, if not avoided, will result in death or
serious injury.
indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
Other important information or tips.
Safety Behavior and Practices
• Use the CPplus only when it is in a techni-
cally sound condition.
• Have a specialist immediately remedy any
malfunctions. Remedy the malfunction
yourself only if a remedy is specified in the
troubleshooting chart in these operating
instructions.
• Have a defective CPplus repaired only by
the manufacturer or its service department.
• Any alteration to the appliance or its con-
trols can be dangerous and will void the
warranty.
• Switch OFF the Combi or Combi D when
refueling, pumping gas or when the recre-
ational vehicle (RV) is in a parking garage,
on a ferry, or in enclosed spaces (such as
a garage, repair shop). Make absolutely
sure that the Combi or Combi D cannot be
switched on via the time switch. To do this,
you have to switch the CP plus off or inter-
rupt the power supply to the control panel.
Intended use
The CPplus is suitable only for installation in
RVs used for recreation, travel, or camping.
The CPplus controls and monitors the following
appliances:
• Combi
• Combi D
• Aventa eco / comfort
Important notes
• If the power supply to the system has been
interrupted, the time / time switch must be
reset.
• If a new or replacement appliance (furnace
or air conditioning system) is connected to
the bus system, the procedure described in
“Initial start-up” must be repeated.
Consumer Safety Information

4
Rotary push button
The rotary push button(8) is used to select and
change setpoints and parameters; it is then
tapped to save the values. Selected menu items
flash.
+
–
Turn clockwise
• The menu is scrolled
through from left to right
• Increase values (+)
Turn counterclockwise
• The menu is scrolled
through from right to left
• Reduce values (-)
Ta p
• Save a selected value
• Select a menu item, go
to the setting level
Press and hold
• Main switching function
– control panel on/off.
Back button
Press the back button(9) to go back to a previ-
ous menu and cancel settings. This means that
the previous values remain unchanged.
Initial start-up
Perform the following steps for initial start-up:
• Switch on the power supply.
– 12 V DC for the CPplus and furnace or air
conditioning system.
• Start searching for the appliances in the
menu item “Service menu” –> “RESET” –>
“PR SET”.
When you have confirmed the selection, the
CPplus is initialized. “INIT ..” appears on the
display while this is in progress. This stores the
devices that have been found in the control
panel.
hot
eco 2
1
3
8
4
5
6
7
9
Operating Instructions
Display and Operating Elements
Fig. 1
1 Display
2 Status line
3 Menu line (top)
4 Menu line (bottom)
5 Power supply display
120VAC (mains supply)
6 Time switch display
7 Settings/Values (displayed text)
8 Rotary push button
9 Back button
Description
• A rotary push button (8) is used to select
menu items in the menu lines (3 + 4) and to
adjust settings.
• Information is shown on a backlit display(1).
• The back button(9) is used to go back to a
previous menu.

5
Start-up
Start / Stand-by screen
When the CP plus is connected to the power
supply, a start screen is displayed after a few
seconds.
Fig. 2
• The display alternates between the cur-
rent time and the room temperature
that you set.
• Special displays on command via
CI-BUS (refer to “Special displays” on
page12).
• After repairs or upgrades, “initial start-
up” has to be repeated.
Functions
The functions of menu lines (Fig.1–3,4) of the
CPplus can be selected in any sequence. The
operating parameters are shown in the status
line (Fig.1–2) or in the display (Fig.1–6).
Switch on / off
Switch on
• Tap the rotary push button.
Previously set values and operating pa-
rameters are active again when the panel
is switched on.
Switch off
• Press the rotary push button for more than
4seconds.
The switching off process of the
CPplus may take a few minutes due to in-
ternal time lags of the furnace or air condi-
tioning system.
Select the setting level
• Tap the rotary push button.
The display shows the setting level. The first
icon flashes.
Fig. 3
Change the room
temperature
• Use the rotary push button(Fig. 1 - 8) to se-
lect the icon in the menu line (Fig. 4 - 3).
• Tap the button to go to the setting level.
• Use the rotary push button to select the fur-
nace (“HEATER”) or air conditioning system
(“AC”).
• Use the rotary push button to select between
“OFF”, “VENT”, “COOL”, “AUTO”.
• Push rotary push button to confirm the
selection.
• Select the desired temperature with the
rotary push button.
• Tap the rotary push button(8) to confirm the
value.
2
3
c da b e
Fig. 4
Furnace (“HEATER”)
Adjustable temperature range 40 – 86 °F
(1°Fincrements) or 5 – 30 °C (1°C increments)
a = Combi (D) on – icon is lit;
the icon flashes until the room
temperature is reached.

6
Air conditioning system (“AC”)
Adjustable temperature range 60 - 88 °F (1 °F
increments) or 16 – 31 °C (1 °C increments)
Air conditioning system can also be oper-
ated with IR remote, see page 12.
Icon Displayed
text
Description
b COOL Air conditioning system
is switched on
c AUTO 1Air conditioning system
is set to automatic
e NIGHT Air conditioning system
is set to silent mode
eVENT Air conditioning system is
in air circulation mode
1Symbol flashes until the desired room temperature is reached.
Quick temperature change possible using
rotary push button (in stand-by screen).
Automatic climate control (“AUTO”)
Adjustable temperature range 64 - 77 °F (1 °F
increments) or 18 - 25 °C (1 °C increments)
Automatic changeover between furnace and air
conditioning system for an approximately con-
stant temperature inside the vehicle.
e = AUTO – Automatic climate control is
activated
Requirements for operation with automatic cli-
mate control:
• The furnace and air conditioning system
must be connected.
• Automatic climate control (ACC) must be
activated in the service menu (see „Service
menu“ on page 9).
Change hot water mode
• Use the rotary push button to select the icon
in the menu line (Fig.5–3).
• Tap the rotary push button to go to the set-
ting level.
• Select the desired hot water mode with the
rotary push button.
• Tap the rotary push button to confirm the
selection.
• Tap the rotary push button to confirm the
value.
2
3
f g h
Fig. 5
Icon Displayed
text
Description
- OFF Hot water generator is
switched off
f ECO * Water temperature
104°F (40°C)
gHOT Water temperature
140°F (60°C)
hBOOST Water container content
is heated quickly (water
container priority) for up
to 40minutes. The wa-
ter temperature is then
kept at the higher level
(about 144°F (62°C)) for
two subsequent heating
cycles. When the water
temperature is reached,
the room is heated again.
This icon flashes until the desired water tem-
perature is reached.
* The water temperature 104°F (40°C) can be
kept in “Heating and hot water mode” for a
limited time only (heating priority).
Select energy mode
The “Select energy mode” menu is dis-
played only if a furnace with electric heat-
ing elements is connected (Truma Combi
eco plus or Truma Combi (D) comfort plus).
• Select icon in menu bar (Fig.6 – 3) with ro-
tary push button.
• Change to the setting level by tapping on the
rotary push button.
• Select desired energy source with rotary
push button.
• Tap the rotary push button to confirm the value.

7
2
3
i j k lm
Fig. 6
Icon Displayed
text
Energy mode
i GAS LP gas
j MIX 1 1Electricity 850 W +
LP gas
k MIX 2 1Electricity 1700 W +
LP gas
l EL 1 1Electricity 850 W
m EL 2 1Electricity 1700 W
1) Mixed mode and electricity mode
Possible only with Truma Combi eco plus and Truma Combi D
comfort plus furnaces with electric heating elements.
When the Combi is switched on (room temperature, hot water
level active), the energy mode selected in the previous heating
process is shown in the status line. The factory setting is gas.
Special features in mixed mode
• Interruption in the 120VAC power supply:
The Combi automatically switches to gas
mode. When the 120VAC power supply is
restored, the Combi automatically switches
back to mixed mode.
• Fault in combustion process (e.g. fuel shortage):
The Combi automatically switches to electric
mode. If the Combi is to run in mixed mode
again, the cause of the malfunction must be
remedied and the Combi has to be started
again by going to the menu item “Malfunc-
tion” and pressing the rotary push button.
See “Malfunction” on page 7.
Special features in electricity mode
• When the 120VAC power supply is inter-
rupted and the 12 VDC supply is on, an er-
ror code is displayed on the control panel.
• When the 120 VAC power supply is recon-
nected, the Combi will restart automatically
with the previous settings without any user
interaction. The error code on the control
panel will disappear.
Select fan level
• Select icon in menu bar (3) with rotary push
button.
• Change to the setting level by tapping on the
rotary push button.
• Select desired fan level with rotary push
button.
• Tap the rotary push button to confirm the
value.
2
3
n o p q r s
Fig. 7
Furnace (“HEATER”)
Icon Displayed
text
Description
– OFF Fan is switched off.
(only selectable if no ap-
pliance is in operation).
o ECO Low fan level
p HIGH High fan level
q BOOST Rapid room heating
Available if the difference
between the selected
and actual room temper-
ature is > 50 °F (10°C)
(depends on connected
heating appliance)
When the furnace is switched on (room
temperature, hot water level selected) the
status bar (2) displays the fan level that
was selected during the previous heating
procedure. The factory setting is “ECO”.

8
Air conditioning system (AC)
Air conditioning system can also be oper-
ated with IR remote, see page 12.
Icon Displayed
text
Description
– OFF Fan is switched off
(can be selected only if no
appliance is in operation).
oLOW Low fan level
p MID Medium fan level
q HIGH Highest fan level
r NIGHT Ultra-quiet fan operation
for both the indoor and
outdoor fans
(only available in cooling
mode)
Set time switch
Risk of carbon monoxide poisoning.
The enabled time switch switches the Combi
(D) on, even when the recreational vehicle
(RV) is parked. The exhaust gas from the Com-
bi (D) can cause poisoning in enclosed spaces
(e.g. garages, repair shops).
If you park the RV in an enclosed space:
• Block the fuel supply (gas) to the Combi
(D).
• Disable the time switch of the CPplus
(“OFF”).
• Switch off the Combi (D) on the CPplus.
If the time switch is ON, the “Disable time
switch (OFF)” menu is displayed.

• Use the rotary push button to select the icon
in the menu line (Fig.1–4).
• Tap the rotary push button to go to the set-
ting level.
Enter start time
• Use the rotary push button to set the hours
and then the minutes.
24h mode 12h mode
Fig. 8
= a. m.
= p. m.
Fig. 9
Enter end time
• Use the rotary push button to set the hours
and then the minutes.
24h mode 12h mode
Fig. 10
= a. m.
= p. m.
Fig. 11
If the start/end time is earlier than the time
when you entered the settings, the operat-
ing parameters are not active until the next
start/end time is reached. Until then, the
operating parameters set outside the time
switch remain valid.
Set the room temperature
For more information „Change the room
temperature“ on page 5.
• Select the desired room temperature with
the rotary push button.
• Tap the rotary push button to confirm the
value.
Selecting the hot water temperature
For more information „Change hot water
mode“ auf Page 6.
• Select the desired hot water mode with the
rotary push button.
• Tap the rotary push button to confirm the
selection.
Select energy mode
For more information „Select energy
mode“ on page 6.

9
• Select the desired energy mode with the ro-
tary push button(8).
• Tap the rotary push button(8) to confirm the
value.
Select fan level
For more information „Select fan level“ auf
Page 7.
• Select the desired fan level with the rotary
push button.
• Tap the rotary push button to confirm the
value.
Enable time switch (“ON”)
• Enable the time switch (ON) with the rotary
push button
• Tap the rotary push button to confirm the
value.
The time switch remains enabled, even for
several days, until it is disabled (OFF).
If the time switch is programmed and
enabled, the time switch icon flashes
(Fig.12–1).
•
1
Fig. 12
Disable time switch (“OFF”)
• Tap the rotary push button to go to the set-
ting level.
• Disable the time switch (OFF) with the rotary
push button
• Tap the rotary push button to confirm the
value.
Fig. 13
Set clock
Display 24h mode Display 12h mode
4
Fig. 14
= a. m.
= p. m.
4
Fig. 15
• Use the rotary push button(Fig.1–8) to
select the “Set clock” icon in the menu
line(Fig.14 & 15–4).
The hour display flashes.
• Use the rotary push button(Fig.1–8) to set
the hours.
• Tap the rotary push button again and the
minute display flashes.
• Use the rotary push button to set the
minutes.
• Tap the rotary push button to confirm the
value.
Service menu
1. Calibrating the room temperature sensor
of the Combi (D) (“OFFSET”)
The room temperature sensor of the connected
Combi (D) can be adjusted individually to suit
the location of the sensor. Settings can be made
in the range from 0°F to -10°F (0°C to -5 °C) in
1°F (0.5 °C) increments.
Example:
Set room temperature 75 °F;
OFFSET = -1 °F;
Setpoint for Combi (D) = 74 °F
Fig. 16
Default setting: 0°F (0°C).
2. AC SET
(Only available if ACC is set to “ON”)
The sensed room temperature can – during
operation of the automatic climate control – be
perceived differently during cooling than during
heating. “AC SET” is used to set an offset be-
tween cooling and heating. The setting can be
made in increments of 1°F (0.5 °C) within the
range of 0 °F to 10 °F (0°Cto5°C).

10
Fig. 24
Example:
Set room temperature 74 °F;
AC SET = 2 °F
Setpoint value for air condi-
tioning system = 76 °F
Presetting: +2°F (+1°C).
3. ACC
(Only available if the air conditioning system
and furnace are connected)
The automatic climate control function AUTO is
activated or blocked with “ACC”.
ON – The automatic climate control function AUTO is ac-
tivated. Automatic climate control function AUTO
can be selected in the Room temperature menu.
– “AC SET” appears in the Service menu.
OFF – The automatic climate control function AUTO is
blocked.
Fig. 25
Presetting: OFF
The function of the Truma automatic climate
control depends on proper installation.
4. °C / °F temperature display
• Select temperature display °C (Celsius) or
°F(Fahrenheit).
Fig. 17
Default setting: °C (Celsius).
5. Change backlighting
Change the backlighting of the CP plus in
10increments.
hot
Fig. 18
6. 12h / 24h Mode
Display in 12h (a. m., p. m.) / 24h mode.
Fig. 19
Default setting: 24h mode
7. Change language
• Select the desired language (German, Eng-
lish, French, Italian).
hot
Fig. 20
Default setting: English
8. Show the version number
Display the version number of the Combi (D)
and CPplus .
Example:
H 1.20.01 –> H = appliance;
1.20.01 = Version number
Appliance
C = CPplus
F = CP plus CI-BUS
H = Combi (D)
Fig. 21
9. RESET
The reset function resets the CPplus to the
factory settings. All your settings are deleted.
Newly connected devices are recognized and
recorded in the control panel.
Reset
• Select “RESET” with the rotary push
button(Fig.1–8).
• Tap the rotary push button.
• “PR SET” is shown in the display.
• Tap the rotary push button to confirm.

11
Fig. 22
When you have confirmed the selection, the CP
plus is initialized.
“INIT ..” appears on the display while this is in
progress.
Warning / Error
Warning
If an operating parameter is outside the target
range, the CP plus immediately jumps to the
“Warning / Error” menu level and displays the
respective error code. The cause of the warning
can be determined and remedied with the aid
of the troubleshooting guide (from page Page
12 and ff).
Return to setting level
• Tap the rotary push button or press the back
button. If the display is in stand-by mode,
tap to activate the background lighting and
tap again to acknowledge the warning.
If possible, the appliance concerned contin-
ues to operate. When the operating param-
eter is within the target range again, this
icon extinguishes again automatically.
Display warning code
1. Select the icon (Fig. 23 – a) with the rotary
push button.
2. Tap the rotary push button.
– The code of the current warning is dis-
played. The troubleshooting chart (refer to
“Troubleshooting” on pagePage 13 and ff)
can be used to determine the cause of the
warning and remedy the error.
a
Fig. 23
Fig. 24
W = Warning
28 = Error code
H = Combi (D)
Malfunction
In the event of an error, the CP plus immediately
jumps to the “Warning / Error” menu level and
displays the respective error code. The cause of
the error can be determined and remedied with
the aid of the troubleshooting guide (from page
Page13 and ff).
Fig. 25
E = Error
2 = Error code
H = Combi (D)
Cause remedied / return to setting level
• Tap the rotary push button.
– The respective appliance is restarted.
This may take a few minutes due to internal
time lags of connected appliances.
If the cause was not remedied, the mal-
function will occur again and the control
panel will again go to the “Warning / Error”
menu level.
Cause not remedied / return to setting level
• Press the back button.
In this case, the error is not acknowledged
in the CP plus and the warning icon (Fig.
23 – a) remains. The appliance remains in
error status. Other connected appliances
can be operated.
Reading out the error code
When the error has been acknowledged, the er-
ror code can be opened again:
1. Select the warning symbol (Fig. 23 – a) with
the rotary push button.
2. Tap the rotary push button. The current error
code is displayed.

12
Maintenance
The CP plus is maintenance-free.
To clean the front, you can use a non-abrasive
cloth moistened with water (and a neutral soap
solution).
Technical data
Display
LCD, monochrome, with backlighting
Diagonal 3.3in. (84mm)
Dimensions (L x W x H)
3.62 x 4.06 x 1.58in. (92 x 103 x 40mm)
Operating temperature range
13°F to 140°F (-25°C to +60°C)
Storage temperature range
13°F to 158°F (-25°C to +70°C)
Interface
TIN bus
CI-BUS (only CI-BUS model)
Power supply
8 – 16.5VDC
Power consumption
max. 65mA (100% backlighting)
10mA (stand-by)
Quiescent current
3 mA (Off)
Weight
approx. 0.22lb (approx. 100 g)
Protection class
Class III
Protection type
IP00
Subject to change without notice.
Special displays
External control panel (CI-BUS)
If a command is sent from an external control
panel with CI-BUS, “CI” is displayed.
The CP plus CI-BUS is a separate variant
that is fitted only in the factory.
Display power supply 120VAC
The icon shows that the 120VAC power supply
(mains supply) is available.
F
hot
Fig. 26
The icon is displayed only in combination
with a Truma Combi eco plus or
Truma Combi (D) comfort plus.
IR remote control
Air conditioning systems – shared use of
IRremote control and CPplus
• Even after connecting the CP plus, the IR
remote control is still available to control the
air conditioning system. The CP plus recog-
nises all settings (except dehumidification
mode) that are made on the air condition-
ing system using the IR remote control. The
IRremote control only transmits the settings
that are shown in its display (no bidirectional
communication).
• Only the time switch of the CP plus may be
used to clearly define the start and end time
of a required period.

13
Troubleshooting charts
Truma Combi
Error code Cause Remedy
W 17 H Hot water mode with empty wa-
ter container.
Switch off Combi and allow to cool. Fill water
container with water.
W 18 H Warm-air outlet blocked. Check the individual outlet openings.
Circulated air intake blocked. Remove blockage from circulated air intake.
E 21 H Room temperature sensor/cable
defective.
Contact Truma Service.
W 24 H Imminent undervoltage, battery
voltage too low < 10.4 V.
Charge battery.
E 41 H Electronics blocked. Contact Truma Service.
E 43 H Excess voltage >16.4 V. Check battery voltage and power sources,
such as battery charger.
E 44 H Undervoltage, battery voltage too
low <10.0 V.
Charge battery. If necessary, replace old
battery.
W 45 H Only Truma Combi eco plus or Truma Combi comfort plus models.
No 120VAC supply voltage. Restore 120VAC supply voltage.
Overheating protection has
responded.
Contact Truma Service.
E 112 H,
E 202 H,
E 121 H,
E 211 H
Gas cylinder closed. Check gas supply.
Gas shut-off valve is closed –
switch position = off.
Open gas shut-off valve –
switch position = on.
Overheating protection has
responded.
Switch off Combi and allow to cool; if neces-
sary, fill the water container with cold water.
Check warm air outlets and circulated air in-
take and remove blockages.
Switch Combi on again.
E 122 H,
E 212 H
Combustion air infeed or exhaust
gas outlet closed.
Check for obstructions such as slush, ice or
leaves and remove from the openings.
Gas shut-off valve is closed –
switch position = off.
Open gas shut-off valve –
switch position = on.
Gas pressure regulation system
defective.
Contact Truma Service.
Overheating protection has
responded.
Switch off Combi and allow to cool; if neces-
sary, fill the water container with cold water.
Check warm air outlets and circulated air in-
take and remove blockages.
Switch Combi on again.
Electronics defective. Contact Truma Service.
W 255 H Combi has no 12 VDC power
supply.
Ensure 12VDC power supply.
No connection between the Com-
bi and the control panel.
Ensure connection between Combi and control
panel.
Control panel cable defective. Contact Truma Service.

14
Error code Cause Remedy
If none of the measures in the troubleshooting chart proves successful or error codes are displayed
that cannot be found in the troubleshooting chart, please contact the Truma Service Center at
1-855-558-7862 or one of our authorized service partners.
Truma Combi D comfort plus
Error code Cause Remedy
E 121 H Interruption in metering pump -
Temperature switch triggered
Remove blockage on the circulated air intake
and ensure adequate ventilation in the installa-
tion space (see operating instructions / circu-
lated air intake)
E 123 H Flame is recognised even though
no flame is burning
Contact Truma service
E 122 H Lack of fuel due to low tank level,
tank is empty and / or vehicle is
on a slope
Fill tank with fuel. Then fill the fuel line as de-
scribed in “Initial start-up” (see Combi Diesel
operating instructions).
E 131 H No connection between furnace
and control panel
Check control panel cable and make sure there
is connection between the furnace and the con-
trol panel
E 150 H Warm air temperature exceeded
Not all warm air ducts are
connected
Check whether the 4 warm air ducts are
connected
Warm air outlets blocked Check the individual outlet openings
Circulated air intake blocked Remove the circulated air intake blockage
E 151 H Water temperature exceeded in
heating and hot water mode
Water temperature sensor exces-
sive temperature
Switch off appliance and allow it to cool down.
Fill water container with water
Warm air outlets blocked Check the individual outlet openings
Circulated air intake blocked Remove the circulated air intake blockage
E 152 H Water temperature exceeded in
summer mode
Water temperature sensor exces-
sive temperature
Switch off appliance and allow it to cool down.
Fill water container with water
Warm air outlets blocked Check the individual outlet openings
Circulated air intake blocked Remove the circulated air intake blockage
W 160 H Undervoltage < 10.2 V Check battery voltage, charge if necessary
Short-term immediate measure. Switch off
major consumers or start up the vehicle en-
gine until the furnace starts to operate (approx.
4minutes).
Battery capacity inadequate, if necessary ex-
change old battery
W 161 H Overvoltage > 16.4 V Check battery voltage / voltage sources such as
the charger
W 163 H One of the temperature switches
has opened
Allow furnace to cool. If this occurs frequently,
contact Truma Service

15
Error code Cause Remedy
W 164 H No 120 V AC operating voltage Restore 120 V AC operating voltage
120 V AC fuse defective Replace 120 V AC fuse (see Combi operating
instructions)
Overheating protection has been
triggered
Reset overheating protection (see Combi oper-
ating instructions)
E 170 H Risk of low voltage < 11.5 V Use the electrical power from the battery spar-
ingly, e.g. restrict lighting
Charge battery
W 255 H Furnace has no 12 V power
supply Ensure that the 12 V power supply is available
No connection between furnace
and control panel
Make connection between furnace and control
panel
If none of the measures in the troubleshooting chart proves successful or error codes are displayed
that cannot be found in the troubleshooting chart, please contact the Truma Service Center at
1-855-558-7862 or one of our authorized service partners.
Truma Aventa eco / comfort
Error code Cause Remedy
34,
47
Unstable 120 V power supply in
connection with generator or in-
verter operation
Ensure shore power supply 120 V AC at the
unit input
If none of the measures in the troubleshooting chart proves successful or error codes are displayed
that cannot be found in the troubleshooting chart, please contact the Truma Service Center at
1-855-558-7862 or one of our authorized service partners.

Manufacturing
Truma Gerätetechnik
GmbH & Co. KG
Wernher-von-Braun-Straße 12
85640 Putzbrunn
Germany
www.truma.com
Sales
Truma Corp
2800 Harman Drive
Elkhart, IN 46514
USA
Toll Free 1-855-558-7862
Fax [phone]
[email protected]
www.truma.net
34020-00786 · 01 · 11/2021 · ©
In case you encounter any problems,
please contact the Truma Service
Center at 855-558-7862 or one of our
authorized service partners. For details see
www.truma.net.
Please have the model number and serial
number (on type plate of appliance) handy
when you call.