Rheem H-84DV, H-84X, H-95DV, H-95X Troubleshooting Manual

TANKLESS GAS

TR UBLESHOOTING

POCKET MANUAL

SVC 820P

For Mid & High Efficiency Platforms

Rheem.com

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This manual is specific to the following model numbers:

MID EFFICIENCY

64DV, 64X / 68DV / 68X

84DV, 84X / 95DV, 95X

150DV, 150X / 180DV, 180X / 200DV, 200X

2-20RDV, 2-20ROF / 2-25RDV, 2-25ROF

2-28RDV, 2-28ROF

-

HIGH EFFICIENCY

(Condensing)

H-84DV, H-84X / H-95DV, H-95X

H-160DV, H-160X / H-200DV, H-200X

H-25RDV, H-25ROF / H-32RDV, H-32ROF

DASH 2 REVISION

1

1

1

1

1

-

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TABLE OF CONTENTS

General Information

Installation Guidelines……………………………………………….. 8
Mid & High-Efficiency Flow Rates…………………………….. 12
Control Board Connectors………………………………………… 14

Diagnostic Points (Voltage & Resistance Readings)……16
Maintenance Mode Instructions………………………………. 21

Altitude Settings on Control Board…………………………… 25
Reset Procedures……………………………………………………..26
Clearing Fault History……………………………………………….27

Error Code Diagnostics

No Error Code & No Hot Water 28

P1 Warning Code 31
1L Warning Code 32
03 Error Code 34
05 Warning Code 35
10 Warning Code 37
11 Error Code 40
12 Error Code 46
13 Error Code 48
14 Error Code 50
15 Error Code 52
16 Error Code 53
24 Error Code 54
29 Error Code

High-Efficiency ONLY (A)…………………………….. 55
Mid & High-Efficiency (B)…………………………… 56

31 Error Code 58
32 Error Code 60
33 Error Code 62
34 Error Code 64
35 Error Code 66
51 Error Code 67
52 Error Code 70

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61 Error Code 73
65 Error Code 76
66 Error Code 78
71 Error Code 79
72 Error Code 81
76 Error Code 84
79 Error Code 85
80 Error Code 89
82 Error Code 92
90 Error Code 94
92 Warning Code 95
93 Error Code 95
99 Error Code 94

HOW TO REMOVE COMPONENTS
Section 1: Control Board Bracket…98
Section 2: Blower Motor…100
Section 3: Flame Rod; Igniter Rod; Igniter Coil…102
Section 4: Orifice Assembly…104
Section 5: Burner Assembly…106
Section 6: Gas Control Valve…107
Section 7: Water Control Valves…111
Section 8: Heat Exchanger Thermistor…114
Section 9: Outlet Thermistor…116
Section 10: Inlet Thermistor…118
Section 11: Ambient Thermistor…120
Section 12: Control Board…122

How to Program Control Board…123

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Important Safety Information

READ the Safety Information

Before inspecting, diagnosing, repairing or operating
any water heater, be sure to examine all of the safety
and warning labels on the water heater. Follow the
instruction on these warning labels. Read and
understand the Use and Care Manual that was
shipped with the water heater. Failure to do so can
result in unsafe operation of the water heater resulting
in property damage, bodily injury, or death. Should
you have any problems reading or following the
instructions in the Use and Care Manual, seek the
help of a licensed and qualified professional.

ELECTRICAL SHOCK

Troubleshooting and repairing this water heater can
expose you to electrical shock. Some of the
diagnostic procedures require the presence of AC and
DC volt electricity. Use extreme caution when
performing these procedures. When replacing an
unserviceable component, turn off all power to the
water heater and check for the presence of power
with a multi-meter or test lamp. The ignition cable
carries more than 10,000 volts of electrical energy.
Use extreme caution when diagnosing the Tankless
Gas Water Heater.

FLAMMABLE LIQUIDS AND VAPORS

Gasoline, as well as other flammable material and

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liquids (adhesives, solvents, etc.), and vapors they
produce are extremely dangerous.
DO NOT handle, use or store gasoline or other
flammable or combustible materials anywhere near or
in the vicinity of a water heater. The spark ignition and
burner assembly in the water heater controls can
ignite these vapors. Failure to do so can result in
property damage, bodily injury or death.

WATER TEMPERATURE ADJUSTMENT

Safety and energy conservation are factors to be
considered when selecting the water temperature
setting on the thermostat. Water temperatures above
125° F can cause severe burns or death from
scalding. The chart shown here may be used as a
guide in determining the proper water temperature for
your application.

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Multi-Meter

Used to

measure

Resistance &

Voltage

Multi-Meter

Needle Set

Used on meter

test leads to

access

connectors

while measuring

Resistance &

Voltage

Manometer

Used to

measure gas

pressure

during standby

and operation

WARNING: WHILE MEASURING VOLTAGE, DO NOT touch any
grounding areas on unit (unless specified in

SAFETY FIRST

Your safety and safety of others is very important.

This manual is only intended for qualified service
technicians. ALWAYS USE CAUTION while testing

voltages and/or gas supply.

Troubleshooting Tools

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WARNING: WHILE MEASURING VOLTAGE, DO NOT cross/touch

multi-meter leads together. This will cause damage to electrical
components.

WHEN INSERTING LEADS INTO WIRING CONNECTOR, insert on the
wiring side to prevent damage to connector.

BEFORE MEASURING RESISTANCE, TURN OFF all electrical power
and make sure to REMOVE CONNECTOR from the circuit
(control board). Check resistance on connector that was
removed.

WHEN MEASURING VOLTAGE, DO NOT REMOVE CONNECTOR;
insert multi-meter leads prior to operating unit.

WHEN MEASURING DC VOLTAGE, if the meter displays the dash (--­) symbol, swap the position of your black and red leads on the
connector.

Multi-Meter Needle Leads

Wiring

Connector

Do NOT touch any

grounding areas
while measuring

voltage

MEASURING VOLTAGE & RESISTANCE

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Installation Guidelines for

HIGH-Efficiency ONLY:

GAS TYPE: Liquid Propane (LP) or Natural (NG)
NG MAX INLET GAS PRESSURE: 10.5 (In. of w.c.)
NG MIN INLET GAS PRESSURE: 4.0 (In. of w.c)
LP MAX INLET GAS PRESSURE: 13.0 (In. of w.c.)
LP MIN INLET GAS PRESSURE: 8.0 (In. of w.c.)
MAX INPUT RATE: 199,900 (Btu/hr)
MIN INPUT RATE: 11,000 (Btu/hr)
GAS CONNECTION: 3/4” NPT
ELECTRICAL CONSUMPTION:
Normal: 100 W
Standby: 3-5 W
Antifreeze Protection: 200 W
MINIMUM ACTIVATION FLOW RATE (gpm): 0.4
EXTINCTION FLOW RATE (gpm): 0.25
VENT SIZE (Indoor ONLY): 2” or 3”

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The vent exhaust and air intake must be vented outside as
described in the use and care manual. DO NOT vent this water
heater through a chimney. It must be vented seperately from all
other appliances.

NOTICE: The unit can be vented using only the following
recommended pipe material.
Use only 2 – or 3-inch diameter pipe. Refer to local codes for
restrictions on the use of PVC, CPVC, or ABS pipe and fittings. All
exhaust venting materials for product installed in Canada must
meet ULC-S636.
Acceptable materials or equivalent:

PVC (Schedule 40, ASTM D-1785
CPVC (Schedule 40, ASTM F-441)
ABS (Schedule 40, ASTM D-2661) (Not permitted in Canada)

The fittings other than the VENT TERMINAL should be equivalent
to the following:
PVC (Schedule 40, DMW, ASTM D-2665
CPVC (Schedule 40, DMW, ASTM F-438)
ABS (Schedule 40, DMW, ASTM D-2661) (Not permitted in
Canada)
Category III Stainless Steel
DO NOT USE Schedule 20, Cell Core, Drain Pipe, Galvanized,
Aluminum, or B-Vent.

Installation Guidelines for

HIGH-Efficiency ONLY:

Number of
90 Degree

Elbows

Maximum

Length of 2”

Straight Pipe

Maximum

Length of 3”

Straight Pipe

0 or 1

5 ft.

38’ 2 3.5 ft.

36’ 6”

3

2.0 ft.

35’

4

Not available

33’ 6”

5

Not available

32’

Number of
90 Degree

Elbows

Maximum

Length of 2”

Straight Pipe

Maximum

Length of 3”

Straight Pipe

0 or 1

60’

150’ 2 58’ 6”

148’6” 3 57’

147’ 4 55’ 6”

145’ 6” 5 54’

144’

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Installation Guidelines for

MID-Efficiency ONLY:

GAS TYPE: Liquid Propane (LP) or Natural (NG)
NG MAX INLET GAS PRESSURE: 10.5 (In. of w.c.)
NG MIN INLET GAS PRESSURE: 4.0 (In. of w.c)
LP MAX INLET GAS PRESSURE: 13.0 (In. of w.c.)
LP MIN INLET GAS PRESSURE: 8.0 (In. of w.c.)
MAX INPUT RATE: 199,900 (Btu/hr)
MIN INPUT RATE: 11,000 (Btu/hr)
GAS CONNECTION: 3/4” NPT
ELECTRICAL CONSUMPTION:
Normal: 100 W
Standby: 3-5 W
Antifreeze Protection: 200 W
MINIMUM ACTIVATION FLOW RATE (gpm): 0.4
EXTINCTION FLOW RATE (gpm): 0.25
VENT SIZE (Indoor ONLY): 3”/5” concentric

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WARNING:

 Use 3-in. /5-in. UL-approved Category III

Stainless Steel vent materials or water heater
manufacturer-approved vent material. No
other vent material is permitted for use with
this appliance.

Venting Requirements

The installation of the venting must comply with
national codes, local codes and the vent
manufacturer’s instructions.

The water heater must be vented to the outdoors.
DO NOT vent this water heater through a chimney. It
must be vented separately from all other appliances.

All coaxial vent components (adapters, pipe, elbows,
terminals, etc.) should be water heater manufacturer­approved Stainless Steel Venting Material (e.g.,
AL29-4C).

Number of 90 Degree

Elbows (bends)

Maximum Length of

Straight Pipe

1

39’

2

37’ 6”

3

36’

4

34’ 6”

5

33’

6

31’ 6”

Installation Guidelines for

MID-Efficiency ONLY:

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Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

6.4

5.6

5.1

4.2

3.6

3.3

3.2

2.8

2.5
Max Water Flow - GPM (gallons per minute)

Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

6.6

5.1

4.6

3.8

3.4

3.3

2.9

2.6

2.3
Max Water Flow - GPM (gallons per minute)

Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

8.4

6.7

6.1

5.1

4.3

3.9

3.8

3.4

3.0
Max Water Flow - GPM (gallons per minute)

Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

9.5

7.4

6.6

5.5

4.7

4.3

4.1

3.7

3.3
Max Water Flow - GPM (gallons per minute)

MID-EFFICIENCY FLOW RATES

64DV & 64X

95DV & 95X

84DV & 84X

68DV & 68X

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Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

8.4

6.6

6.0

5.0

4.3

3.9

3.7

3.3

3.0

Max Water Flow - GPM (gallons per minute)

Temperature Rise ( ° F)

35

45

50

60

70

77

80

90

100

9.5

8.4

7.6

6.3

5.4

4.9

4.7

4.2

3.8

Max Water Flow - GPM (gallons per minute)

H95DV & H95X

H84DV & H84X

HIGH-EFFICIENCY FLOW RATES

(Condensing)

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G

C

S

U

R

H

K

B

T

M

P

***FUEL TYPE CHIP*** – When replacing Control Board, you
must use the original chip on the new Control Board. New
Control Board must be programmed (refer to page 122).

P – Red, Red (High Efficiency ONLY)
M – White Molex: Grey
T – Blue Molex: Blue (Indoor Models ONLY)
K – Red, Black, Green, Yellow, White, Grey, Blue
H – White, White, Grey, Grey
U – White, White
S – Brown, Black, Red
C – Brown, White, Orange, Blue, Yellow, Green, Red, Black
B - Brown, White, Orange, Blue, Yellow, Green, Red, Black
G – Indoor Units: Blue, Yellow, White, Black, Red
G – Outdoor Units: Yellow, Orange, Red, Blue, White
R – Mid Efficiency: Red, Black, Black, Red, Yellow, White, Blue
R – High Efficiency: Red, Black, Black, Red, Green, White, Blue

Control Board

Connectors

Connector Wire

Colors

Fuel Type Chip

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CONTROL BOARD CONNECTORS

M

T

P

F

A

R

U

C

B

S

V

FUSES

(3A)

POWER

LED

DIP1

DIP2

MIN

MAX

ADJ

H

K

G

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Diagnostic Points on Control Board

Connection

Wire

Color

Normal Value

What are

you

checking?

I – J

W1-BK2

AC108-132V

Do you have
power to the

control

board?

U

W1-W2

50KΩ-500KΩ

Is the

overheat film

wrap OK?

S

BR1-BK2

DC 2-5V

(Pulse)

More than 1,310

pulses/minute

Does the

water flow

sensor send

a pulse?

(Only when

water is

flowing thru

the unit)

S

R3-BK2

DC 11-17V

Does the

water flow

sensor have

voltage?

(Power ON;

no water

flow)

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Connection

Wire Color

Normal Value

What are

you

checking?

G

BK4-R6

DC 144-192V

Does the

fan motor

have the

proper

voltage?

W3-BK4

DC 12-18V

Is the

overheat

film wrap

OK?

BR1-BK2

DC 4-10V

(Pulse)

Is the fan

motor

producing

regular

pulse?

R

W6-BK3

68°F=10.3KΩ

104°F=4.9KΩ

Is the water

inlet

thermistor

working?

R

Mid-

Efficiency:

Y5-BK3

High-

Efficiency

(condensing):

G5-BK3

68°F=10.3KΩ

104°F=4.9KΩ

Is the heat
exchanger

thermistor

working?

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Connection

Wire Color

Normal Value

What are

you

checking?

R

R4-BK3

68°F=10.3KΩ

104°F=4.9KΩ

Is the water

outlet

thermistor

working?

R

BL7-BK4

Mid-Efficiency

INDOOR

Units:

68°F=10.3KΩ

104°F=4.9KΩ

Is the

ambient air

thermistor

working?

ALL

OUTDOOR &

ALL

CONDENSING

units:

68°F=10.3KΩ

104°F=4.9KΩ

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Connection

Wire

Color

Normal Value

What are

you

checking?

R

R1-BK2

DC1.5-14V

40Ω-80Ω

Is the

P.G.F.R.

valve

operating?

(Proportional

Gas Flow

Regulator –

full

modulating

valve)

M

W1-GND

AC 1-100 V

Flame rod

detecting

flame?

T

BL1-GND

AC 1-100 V

Flame rod
detecting
flame?

H

GY3-GY4

AC 108-132 V

Is the igniter

working

properly?

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Connection

Wire

Color

Normal Value

What are

you

checking?

K

Y1-BK6

DC 90-120 V

0.8KΩ-2.4KΩ

Gas inlet

solenoid

valve OK?

K

W2-BK6

DC 90-120 V

0.8KΩ-2.4KΩ

Solenoid

valve 1 OK?

K

GY3-BK6

DC 90-120 V

0.8KΩ-2.4KΩ

Solenoid

valve 2 OK?

K

R5-BK6

DC 90-120 V

0.8KΩ-2.4KΩ

Solenoid

valve 3 OK?

K

BL4-BK6

DC 90-120 V

0.8KΩ-2.4KΩ

Solenoid

valve 4 OK?

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Maintenance Mode Panel Display

INSTRUCTIONS

The Rheem/Ruud Tankless has a maintenance mode
chart on the remote control. To access the
maintenance mode, turn the unit OFF at remote
control and make sure water flow is OFF. 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 (NOTE: Unit will default to
120° F). By pressing the UP and DOWN arrow keys
on the remote control, 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: (See Diagram on Page 22) DIP1 - 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.
(NOTE: Unit will maintain the set temperature)

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.
The number is always displayed as the first digit. 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.

(Maintenance Mode Table on Page 23)

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You will see the following as you navigate the Y
table in maintenance mode:

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)

control board

DIP1

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NOTES:
_________________________

_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________
_________________________

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Altitude Settings on Control Board

Locate the two DIP switches at top right of Control Board.
Switch labeled DIP2 is the bottom switch. Altitude
adjustments must be performed on DIP2 ONLY.

Sea Level (0ft – 2000ft)

All switches should be in the
OFF position (DOWN)

2000ft – 5400ft

3RD switch should be in the
ON position (UP)

5400ft –8500ft

4TH switch should be in the
ON position (UP)

DIP1

DIP2

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ONLY for ‘Hard Lockouts’ - Error Codes: 10, 13 & 99

1. Turn remote control OFF; leave unit plugged in. Remove
front cover. Locate the DIP Switches (Upper Right on the
control board).

2. Make sure all the DIP Switches are OFF (down position).

3. Locate DIP1 – Switch #2 and turn it ON (up position)
then immediately turn it OFF.

4. Within 5 seconds, press and hold the MIN and MAX
buttons for at least 2 seconds.

5. The remote control will flash “UL” then it will go solid.
This indicates the heater has been reset.

6. Release the buttons.

7. Turn remote control ON. You may operate unit.

control board

RESET PROCEDURE

DIP1

MIN

MAX

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1. Turn remote control OFF; leave unit plugged in. Remove
front cover. Locate the DIP Switches (Upper Right on the
control board).

2. Make sure all the DIP Switches are OFF (down position).

3. Locate DIP1 – Switch #1 and turn it ON (up position)
then immediately turn it OFF.

4. Within 5 seconds, press and hold the MIN or MAX button
for at least 2 seconds.

5. The remote control will flash “CL” then it will go solid.
This indicates the fault history has been cleared.

6. Release the buttons.

7. You can verify clearing history by entering maintenance
mode and check the code at location 1E. Should read
NULL (- - two dashes).

8. Turn remote control ON. You may operate unit.

control board

CLEARING FAULT HISTORY

DIP1

MIN

MAX

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No Error Code & No Hot Water

Explanation: No hot water is delivered when water is

flowing through unit and remote control displays the

hot water temperature setting. [For ‘NO POWER’

complaint (remote control will not turn on) – check
wall outlet for 120 volts. If voltage is present, check
the two 3-amp fuses at the control board]

Possible Causes:

 Water flow (0.4 GPM to activate)
 DIP1 setting on main control board
 Water flow sensor

Water Flow:

1. Use cold water shutoff valve to turn OFF
water supply to unit. Turn remote control
OFF; unplug power cord at wall outlet. Wait
10 seconds; plug power cord back into outlet;
wait 20 seconds; turn the remote control ON.
Turn water supply ON; check the nearest hot
water fixture for hot water.

2. Open multiple hot water fixtures. If unit fires
then there is not enough water flow to
engage the unit at a particular fixture. Check
your fixture aerator screen(s) for debris.
Clean if necessary.

3. Your water flow may be restricted by debris in
water filter. Remove the water filter and
inspect. Clean if necessary.

4. Your water lines might be crossed. Make
sure your hot and cold water supply lines are
connected to the appropriate hot and cold
water assembly connections on the unit.

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FINAL CHECK: Water flow sensor in water volume
control valve.

Check connector ‘S’ between the Red and Black
wires. With the unit ON and no water flow, you
should read 11-17 DC volts. If not, replace the control

board. IF you have voltage, then.......

With the water flowing, measure 2-5 DC volts
between the Brown and Black wire. (This is
measuring water flow thru the control). IF you have a
reading and no main burner, replace the control
board. If you do not have a reading, remove any
debris from water volume control valve.

Single Unit Installations ONLY:

All DIP1 switches must be in the ‘OFF’ position
(DOWN).

DIP 1

Manifold (Multiple) Unit Installations
ONLY:

Go to 03 - Error Code to verify proper DIP1 setting.

Water Flow Sensor:

Connector Location

On Page 14