Paloma PH2-20R OFN User manual

R
Tankless Gas Water Heaters
High Efficiency Condensing Models
PHH-25ROFN & PHH-32ROFN (Outdoor Natural Gas Models)
PHH-25ROFP & PHH-32ROFP (Outdoor L.P. Gas Models)
PHH-25RDVN & PHH-32RDVN (Indoor Direct Vent Natural Gas Models)
PHH-25RDVP & PHH-32RDVP (Indoor Direct Vent L.P. Gas Models)
Engineering Handbook
D
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C
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T
I
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CERTIFIED
R
Mid Efficiency Models
PH2-20R OFN, PH2-25R OFN & PH2-28R OFN (Outdoor Natural Gas Models)
PH2-20R OFP, PH2-25R OFP & PH2-28R OFP (Outdoor L.P. Gas Models)
PH2-20R DVSN, PH2-25R DVSN & PH2-28R DVSN
(Indoor Direct Vent Natural Gas Models)
PH2-20R DVSP, PH2-25R DVSP & PH2-28R DVSP
(Indoor Direct Vent L.P. Gas Models)
Outdoor Water Heater
PH2-20, 25 & 28ROF Indoor Direct Vent Water Heate
r
PH2-20, 25 & 28RDVS
Outdoor Water Heater
PHH-25ROF & PHH-32ROF Indoor Direct Vent Water Heater
PHH-25RDV & PHH-32RDV

2 | Page SVC 820 Tankless Gas Trouble Shooting Manual
2
TABLE OF CONTENTS
General Information
Specifications 4
Sequence of Operations 5
1. Ignition Sequence 6
2. Monitoring Sequence 7
3. Shutdown Sequence 8
Error Code Table 9
Components “Callouts” 15
Maintenance Mode “How To” 16
Control Board “Callouts” 18
Reset Procedure 21
Clearing Fault History 21
Error Code Diagnostics
No Error Code & No Hot Water 22
P1 Warning Code 23
1L Warning Code 24
03 Error Code 25
05 Warning Code 26
10 Warning Code 29
11 Error Code 33
Gas Supply & Venting 33
Igniter Rod (Spark is NOT visible) 34
Flame Rod (Flame IS visible) 36
Gas Control Valve(Spark IS visible; Flame is NOT visible) 38
Control Board 40
12 Error Code 43
Gas Supply & Venting 43
Flame Rod(s) 44
13 Error Code 47
Venting 47
Ground 47
Flame Rod(s) 48
14 Error Code 50
15 Error Code 53
16 Error Code 54
24 Error Code 56
29 Error Code 59
31 Error Code 60
32 Error Code 62

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3
TABLE OF CONTENTS
33 Error Code 64
34 Error Code 66
35 Error Code 68
51 Error Code 70
52 Error Code 72
61 Error Code 74
65 Error Code 76
66 Error Code 78
71 Error Code 80
72 Error Code 82
76 Error Code 84
79 Error Code 86
80 Error Code 88
82 Error Code 90
90 Error Code 91
92 Warning Code 92
93 Error Code 92
99 Error Code 93

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4
Specifications common to all models
Model See specification sheets for current models and specs
Purpose Domestic Hot Water (DHW) supply for showers, cleaning, and laundry
Rated Gas Input Btu/Hr.) See specification sheets for current models and specs
Dimensions See specification sheets for current models and specs
Installation
Indoor Wall Mounting : Can be vented horizontally or vertically
Outdoor Wall Mounting :Venting not required
Mid Efficiency :ONLY uses Stainless steel (Category III; 316L Certified)
concentric venting for indoor installation
High Efficiency: Uses PVC; CPVC; ABS; or Stainless Steel (Category III; 316L
Certified) venting for indoor installation
Working Water Pressure 14 PSI minimum; 150 PSI maximum
Minimum Water Flow 0.4 GPM to activate burner; can be reduced to .26 GPM once burner is activated
Maximum Water Flow Based on 35 degree rise; See specification sheets for current models and specs
Gas Connection 3/4” NPT Male
Water Connection 3/4" NPT Male
Vent Size Mid Efficiency: 3”/5” Concentric Vent
High Efficiency: 2” or 3” Two Pipe Venting (optional concentric vent termination)
Max Vent Length See Use & Care Manual for each product type
Inlet Gas Pressure Natural Gas: Minimum 4.0” w.c. Maximum 10.5” w.c.
L.P. Gas : Minimum 8.0” w.c. Maximum 14.0” w.c.
Hot Water Supply
Temperatures
Factory Setting: 85F – 140F (Up to 140 with Override Adjustment)
Commercial Setting: Up to 185F via program chip
Electrical
Rating: 120 VAC/60Hz, 3 Amps
Wire : Indoor Models - 3 Prong (Edison) Power Supply Cord
Outdoor Models – require field wiring
Fuse : 3A Fuse x 2 (line voltage)
Safety Devices
Flame Rods
Overheat Film Wrap for Heat Exchanger
Heat Exchanger Thermistor (Boiling Point Safety)
Electronic Burner and Combustion Monitoring and Control
Freeze Protection Minus 30F (Without Wind-Chill Factor) with power applied
Remote Control
Standard: Main Remote Control UMC-117 (included)
Optional: Bath Remote Control USC1-117 – 120 F Max Limit
Optional: Second Bath Remote USC2-117 – 120 F Max Limit
Only one of each type remote above can be installed on a single unit
Only one of each type remote above can be installed on multiple manifold units

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5
Sequence of Operations
ACTION EXPLANATION
Hot water faucet is open creating a demand Hot water draw initiates water flow thru the water
heater
Water flows thru the Water Flow Sensor Minimum flow rate of .4 GPM to activate @ 35
o
T
Control Board senses the flow rate has reached a
minimum demand of .4 GPM@ 35o T
Control Board is the ‘brains’ of the machine and controls
all input and actions during sequence of operations
Blower Motor conducts a pre-purge Pre purge is designed to verify we have a clear and clean
vent and supply oxygen to burner for proper ignition
The Proportional Gas Flow Regulator allows the
gas to flow to the main burner
Proportional Gas Flow Regulator initially opens to 75% of
BTU input
Simultaneously, the Igniter Rod sparks and ignites
the main burner
The Igniter Rod ignites the fuel in the main burner area.
All burners will fire initially
After ignition, the Flame Rods sense and monitor
the flame and ensure proper combustion
The purpose of the flame rods is to verify flame and
proper combustion. In the event of flame failure or
improper combustion, the unit will go into an error code
The “In Use Indicator” on the remote control turns
“ON” (Red) and the “Priority Indicator” is Green
(multiple remote controls)
Main burner is now lit. The PCB goes thru a series of
calculations (input sensing) to balance out the cold-water
temperature, the thermostat setting, the hot outlet
temperature, and the BTU required to heat the water.
The Proportional Gas Flow Regulator continuously
adjusts the gas volume in order to maintain the
outlet temperature. The water flow sensor also
adjusts the proper amount of cold water mix flow
to supply a stable hot water temperature at all
times. A signal is also sent to the Blower Motor in
order to constantly maintain the correct
proportion between gas and air volumes
The PCB is constantly monitoring all of these inputs and
actions to ensure the outlet water temperature is within
1-5 degrees of thermostat setting. It also monitors the
BTU required to heat the cold water to the thermostat
setting and adjusts the gas valve accordingly
(Indoor Models Only) When the air intake is
blocked, or oxygen is not sufficient, the output of
the Flame Sensor changes
The PCB senses this change and controls the Fan and Gas
Valve in order to prevent imperfect combustion. If the
PCB cannot correct such condition, the unit will go into
an error code
When the hot water tap is closed, the flow rate
signal from the water flow sensor stops
Gas valve is closed. Main burner shuts off
The Fan continues to run for a few minutes Purpose is to cool the heat exchanger, exhaust all
combustions gases, and to maintain the burner chamber
charged with air for immediate ignition if there is
another hot water demand

6 | Page SVC 820 Tankless Gas Trouble Shooting Manual
6
YES
NO
Health
Check
82 – Program Chip
79 – Blower Motor
71 – Gas Control Valve
76 – Remote Control
14 – OHL
Open Hot Water Tap
Up &
Down
Buttons
24: Activated > 20 Seconds
Thermistors
Check
Blower
Speed
Flue
Blockage
Detect
Flame
False
Flame
1-2
Ignition
Attempt
31 – Inlet Thermistor
33 – Outlet Thermistor
32 – HE Thermistor
34 – Ambient Thermistor
61
90: > 12 seconds
72: > 5 seconds
11: > 2 Ignition Attempts
Igniter Rod Off
Gas Control Valve & Igniter Rod On
Blower On
Next Page
1 – Ignition Sequence
SEQUENCE OF OPERATIONS:
1. Ignition Sequence
2. Monitoring Sequence
3. Shutdown Sequence
Plug In

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7
Flow Chart
No
Flame Failure
Ignition Failure
10 Warning Code Flashing
05 Warning Code Flashing
YesYes
No No
Decrease of
Fan Motor
Ventilation
Imperfect
Combustion
Alarm
Attempt to Re-Ignite
11
12
Yes
1-2 Ignition
Attempts
Condensation Not Draining 29: Condensing Only
OHL Activated 14
Outlet water temperature
too high
16
Hot Water > 207 Degrees F
for more than 15 seconds 15
Heat Exchanger > 207
Degrees F for more than 15
seconds
15
Heat Exchanger
Outlet Temp Too
Low
Ambient
Thermistor
Outlet Thermistor Heat Exchanger
Thermistor
Inlet Thermistor
29 34 33 32 31
Trouble with
Thermistor(s)
PGFR – Gas Control
Valve
Blower Motor Water Control Body Bypass Assembly
35
52
61
65
66
Gas Control Valve Communication
Trouble – Remote
Control
Blower Motor
Current Not
Detected
Flame Rod
71
76
79
13
Next Page
2 – Monitoring Sequence: while unit is in
operation

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8
Close Hot Water Tap
Checking
Blower
Motor
Detect
Flame?
Gas Control Valve Off
Unit in Stand-By mode
80: Gas Control Valve
51: Gas Control Valve
Yes (8 Seconds Later)
99
3 – Shutdown Sequence

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9
Error Code
Code
Fault Remedy
No
Code
Flow Rate/Maintenance:
Nothing Happens When
Water Is Flowing Through
Unit.(Control Board
Displays Water Temp)
1. Increase water flow rate or set higher temperature
2. New Installations: Ensure hot and cold water lines are not crossed
3. Check for plumbing crossover in the home
4. Clean water inlet filter
5. Check water flow sensor (may be jammed)
P1
Maintenance Warning:
Water Flow Too Low
(Unit Will Still Be
Operable; Minimum Flow
0.40 GPM To Activate @
35o )T
1. Check hot water tap flow (clean aerator if necessary)
2. Clean water inlet filter
3. Increase flow rate or set higher temperature
If maintenance requirements are met:
1. Check water flow sensor
1L
Maintenance:
Water Heater Has
Buildup Of Lime/Scale
Deposits
1. Flush Heat Exchanger
2. High Altitude Installations: ensure proper altitude settings have been made
03 MIC 185, MIC 6, & EZ Link
1. Check communications cable connection
2. Check # 4 dip switch setting is in the ‘ON’ position (Dip Set # 1 (Top), Dip
switch # 4 on the water heaters only)
05
Maintenance Warning:
Air Intake Or Vent
Exhaust May Be Blocked
(Unit Will Still Be
Operable)
1. Remove any vent blockage
2. Make sure venting meets all installation requirements
If maintenance requirements are met:
1. Check fan motor
Installation Warning:
The vent Pipes On The
Vent Termination May
Not Be Connected (Unit
Will Still Be Operable)
Make sure all venting is properly sealed and meets all venting requirements (diameter;
vent lengths; venting material; venting obstructions; and all other installation
requirements as described in installation manual)
If installation requirements are met:
1. Check Blower Motor

10 | Page SVC 820 Tankless Gas Trouble Shooting Manual
10
10
Maintenance:
Decrease Of Ventilation
Amount (Blower Motor)
Clean any blockage in venting, Blower Motor, air intake
If maintenance requirements are met:
1. Check Blower Motor
11
Installation/Gas supply:
Ignition Failure
1. Ensure you have gas to the appliance and valves are turned ‘ON’
2. Ensure gas type, gas pressure, and gas volume are correct
3. Bleed all air from gas lines
4. Ensure gas line, meter, and regulator are sized properly
5. Ensure appliance is properly grounded
If installation/gas supply requirements are met:
1. Check Gas Control valve for open or short circuits
2. Ensure Igniter Rod is operational
3. Check igniter/Flame Rod(s) and Igniter/Flame Rod(s) wiring harness for
damage
4. Check Control Board
5. Check Flame Rod Status
12
Gas supply/Installation/
Maintenance:
Flame Failure (Had Main
Burner, Then Lost It)
1. Ensure gas type and pressure is correct
2. Bleed all air from gas lines
3. Ensure Flame Rod wire(s) is connected
4. Check Flame Rod(s) for carbon build-up
5. Ensure gas line, meter, and regulator are sized properly
6. Ensure appliance is properly grounded
7. Check power supply for proper voltage and voltage drops
8. Disconnect and re-connect all wiring harnesses on Gas Control Valve and
Control Board
If gas supply/installation/maintenance requirements are met:
1. Check gas valves for open or short circuits
2. Check flame rod(s) and flame rod(s) wiring harness for damage
3. Check PCB
4. Check flame rod(s) status

SVC 820-Tankless Gas Trouble Shooting Manual Page | 11
11
13
Indoor ONLY
Venting:
Flame Rod FL-2: Reads
Poor Or Improper
Combustion
Ensure intake and exhaust venting meet all installation requirements (diameter; vent
lengths; venting material; venting obstructions; and all other requirements as
described in the Use & Care manual {Make sure exhaust is not recirculating into fresh
air intake})
If venting requirements are met:
1. Remove any blockage from venting or from in front of vent termination
2. Verify altitude settings
3. Check Flame Rod FL-2
4. Check Blower Motor
14
Condensing only:
Maintenance:
Flue Temperature Too
High
Condensing Only:
1. Clean blockage in heat exchanger
2. Remove any blockage from Blower Motor and exhaust vent
Mid Efficiency &
Condensing:
Over Heat Limiter (OHL)
Fault
Mid Efficiency & Condensing:
If ‘Condensing’ maintenance requirements are met:
1. Verify “U” connector is connected to Control Board
2. Verify wiring harness is connected to OHL
3. Check heat exchanger for cracks and/or separations
4. Inspect Overheat Wrap (Overheat wrap failure: Replace unit)
5. Check thermal overload sensor (condensing models only)
15
Maintenance:
Boiling Safety Device
(Heat Exchanger
temperature reached
207 F degrees for more
than 15 seconds)
1. Flush Heat Exchanger (lime/scale buildup)
2. Check for closed water heater inlet valve or restrictions in cold water inlet
pipe (must be fully open)
3. On commercial water heater, lower set point temperature below 1800F at
high altitudes
If maintenance requirements are met:
1. Check Heat Exchanger Thermistor
16
Maintenance:
Outlet Water
Temperature Is Above
Remote Thermostat
Setting
1. Check for clogged Heat Exchanger
2. Check for restrictions in airflow around unit and vent terminal
If maintenance requirements are met:
1. Check Outlet Thermistor
2. Check Heat Exchanger Thermistor
3. Check gas valve

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12
24 Malfunction Of
Operational Switch
1. Turn off water. Disconnect Remote Control and retry
2. Verify unit is electrically grounded
3. Press MIN and MAX button on Control Board to reset
29
Condensing Only:
Maintenance:
Neutralizer Is clogged
Condensing Only:
1. Ensure shipping cap for drain line is removed and drain line is not blocked
2. Clear all neutralizer drainage ports inside of unit
3. Clear neutralizer drainage line outside of unit
4. Clean air inlet screen
5. Clean heat exchanger fins
If maintenance requirements are met:
1. Check neutralizer water level electrode
Mid Efficiency &
Condensing:
Maintenance:
Heat Exchanger
Temperature Is Too Low
Mid Efficiency & Condensing:
1. Clean air inlet screen
2. Clean heat exchanger fins
31 Inlet Thermistor
1. Check Thermistor wiring for damage
2. Check and clean scale from Thermistor
3. Ohm Thermistor
32 Heat Exchanger
Thermistor
1. Check Thermistor wiring for damage
2. Check and clean scale from Thermistor
3. Ohm Thermistor
33
Outgoing Water
Temperature Sensor
1. Check Thermistor wiring for damage
2. Check and clean scale from Thermistor
3. Ohm Thermistor

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13
34 Ambient Thermistor
1. Check Thermistor wiring for damage
2. Check and clean Ambient Thermistor
3. Ohm Thermistor
If wiring and component readings are normal:
1. Check for restrictions in airflow around unit and vent terminal
2. Ensure fan blade is tight on motor shaft and spins freely
35 Improper Thermistor
Connection
1. Check that all Thermistors are secured to proper connections on Control
Board
2. Check that all quick connectors between Control Board and Thermistors
51 Gas Control Valve 1.
Check Gas Control Valve wiring harness for loose or damaged terminals
2. Ohm Gas Control Valve
52 PGFR Valve
(Modulating Valve)
1. Check PGFR Valve wiring harness for loose or damaged connections
2. Ohm PGFR Valve
61
Installation/Maintenance:
Blower Motor
1. Ensure Blower Motor will turn freely. Motor will operate with a small amount
of restriction
2. Check wiring harness to Motor for damaged and/or loose connections
3. Check venting length not to exceed max lengths and bends
65 Water Control Valve 1. Check Water Control Valve wiring harness for loose or damaged terminals
2. Check for proper voltage to Water Control Valve
66 Water Bypass Valve 1.
Check Water Bypass Valve wiring harness for loose or damaged terminals
2. Check for proper voltage to water by-pass solenoid
71 Gas Control Valve 1. Check Gas Control Valve wiring harness for loose or damaged terminals
2. Ohm Gas Control Valve
72 Flame Rod
(Detected False Flame)
1. Ensure Flame Rod(s) is touching flame when unit fires
2. Check inside burner chamber for any foreign material blocking flame at Flame
Rod(s)
3. Check all wiring to Flame Rod for damage
4. Check Flame Rod for proper voltage
5. Remove Flame Rod and check, clean with steel wool (Do not use sandpaper)

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14
76 Communication Fault
With Remote Control
1. Check Remote Control wiring for loose or damaged connections
2. Bypass Remote Control: connect Remote Control directly to remote
connection at bottom of the heater. Replace cable if found to be faulty
3. Remove water heater power cord from 3 prong outlet. Disconnect the
Remote Control. Plug heater back into supply and test heater without Remote
Control connected
79 Blower Motor
Current Fault
1. Ensure Blower Motor will turn freely. Motor will operate with a small amount
of restriction
2. Check Fan Motor for proper voltage and for water (condensation) damage
80
&
81
Gas Control Valve 1. Ohm Gas Control Valve
2. Check voltage of all Flame Rods
82
Installation:
Control Board Is Not
Programmed.
Verify Program Chip is installed
90
Maintenance/Installation:
Blocked Flue/Air Intake
Clean any blockage in Heat Exchanger, Blower Motor, inlet flue and exhaust flue
92
Condensing Only:
Maintenance Warning:
Neutralizer Needs To Be
Replaced (Unit Will Still
Be Operable)
Replace Neutralizer
93
Condensing Only:
Maintenance:
Neutralizer Must Be
Replaced (Unit Will NOT
Operate)
Replace Neutralizer
99
Maintenance/Installation:
Blower Motor Cannot
Vent
1. Clear vent blockages
2. Check for blocked Heat Exchanger

SVC 820-Tankless Gas Trouble Shooting Manual Page | 15
15
COMPONENTS
B
3
2
4 5
9
10 7
6
11
8
1
D
A
1. Condensing ONLY: Secondary
Stainless Steel Heat Exchanger
2. Condensing ONLY: Neutralizer
3. Primary Heat Exchanger
4. Flame Rod(s)
5. Sight Glass
6. Igniter Rod
7. Igniter Coil
8. Gas Control Valve
9. Water Control Valve
10. Water Bypass Valve
11. Control Board
12. Blower Motor (Behind Control Board)
A. Heat Exchanger Thermistor
B. Outlet Thermistor
C. Inlet Thermistor
D. Ambient Thermistor
C

16 | Page SVC 820 Tankless Gas Trouble Shooting Manual
16
Maintenance Mode Panel Display
The Rheem Tankless has a Maintenance Mode chart on the Remote Control.
To access the Maintenance Mode, turn the unit OFF at Remote Control. Then
hold down the UP and DOWN arrow keys at the same time for 5 seconds.
You will hear an audible beep and see the display go to 1E. By pressing the
UP and DOWN arrow keys on the remote thermostat, you can access a
variety of information about the water heater. To activate the unit while
displaying the maintenance panel: push the power button once, open a hot
water fixture, and the green LED will illuminate. This will allow you to access
a variety of real time information while the unit is in operation.
Shortcut: Lift dip switch #1 to the up position to go immediately into maintenance mode. This can be
done while the water heater is in operation.
While in Maintenance Mode you want to push the up arrow key to select the table you wish to view.
The table is designated by a letter and is always displayed as the second digit. Then push the down
arrow key to display the number item in the table you selected. You can select as many as 8 readings
for each table.
To perform diagnostics in this service manual, press the up arrow until you get to table1Y.
Now using your down arrow you can change the number in front of Y. As you move through the
diagnostic readings, the selected table will flash first and then the diagnostic reading. You will see the
following as you navigate the Y table:
0Y = Flame Rod Status
1Y = Water Flow in gallons per minute
2Y = Ambient air temperature
3Y = Water inlet temperature
4Y = Heat exchanger temperature
5Y = Hot water outlet temperature
6Y = Fan speed (x 100 rpm)
7Y = Power for modulating gas valve
8Y = Null (no reading)
9Y = Null (no reading)
*FULL MAINTENANCE DISPLAY CHART AVAILABLE ON NEXT PAGE*

SVC 820-Tankless Gas Trouble Shooting Manual Page | 17
17
MAINTENANCE INFORMATION TABLE
First Digit – Use DOWN arrow key on Remote Control
Second Digit – Use UP arrow key on Remote Control
0* 1* 2* 3* 4* 5* 6* 7* 8* 9*
*E Null
Fault Codes of the most recent 8 faults
Null
*F Null Sequence Number of the most recent 8 faults Null
*C Total combustion times until recent error fault (** x 10000times) Null
*D Total combustion times until recent error fault (** x 100 times) Null
*H Total combustion period until recent error fault (** x 1000 hours) Null
*J Total combustion period until recent error fault (** x 10 hours) Null
*Y
Flame Rod
Status
GPM Flow Rate
(*.* GPM)
Ambient Air Temperature Cold Water Inlet Temperature
Heat Exchanger Temperature
Hot Water
Outlet
Temperature
Fan Speed x 100
RPM
Power for
P.G.F.R. valve
Null Null
*A
Null Control Line Fan Detective Value Fan Motor Current Null Null Null Null Null Sequence Number

18 | Page SVC 820 Tankless Gas Trouble Shooting Manual
18
CONTROL BOARD – Color Picture
•Each letter indicates the connector identifier
es
ood. Proceed to your error code to resolve the
sue. The error codes are listed in the table of
ontents.
M T
MIN
MAX
ADJ

SVC 820-Tankless Gas Trouble Shooting Manual Page | 19
19
CONTROL BOARD
DIP #1 – Adjust max temperature; EZ Link cable
DIP #2 – Adjust for altitude differential
MIN & MAX (SW1 & SW2) – Adjust water
temperature setting; gas pressure; etc.
ADJ (SW3) – Adjust gas pressure etc.
M – Flame Rod for all models (detects flame)
T – Flame Rod for indoor models only (monitors
combustion efficiency)
F – Communication port (manifold installations)
A – Fuel type and temperature Program Chip
U – Over Heat Limiter (OHL)
R – Thermistors (Ambient, Inlet, Outlet, Heat
Exchanger) & Modulating Gas Valve (PFGR)
S – Water Flow Sensor
C – Water Control Valve
B – Water Bypass Valve
V – Remote Control (Main Bath)
G – Blower Motor
K – Gas Control Valve
H – Igniter Rod

20 | Page SVC 820 Tankless Gas Trouble Shooting Manual
20
NOTES:
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