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and the gas valve had to be
removed, make sure that each
gas valve wire is plugged into the
proper place. (For each connector,
the number stamped on the metal
must match the number that is
printed on the wire's label.
3. Verify that the supply gas pressure
is within the specified limits. Too
high of an inlet gas pressure may
cause the main gas valve to jam or
could be damaged.
4. With the power off, check the
resistance of each valve. Normal
resistance reading for SV1 is 1.35-
1.65 kΩ. Normal resistance reading
for SV2 and SV3 is 2.07-2.53 kΩ.
If the resistance is out of range,
replace the gas valve.
5. Check the voltage across these
solenoid gas valve wires during
operation. (The dark blue wire is
common.)
•
SV1: Green (#9) & Blue
•
SV2: Orange (#53) & Blue
•
SV3: Red (#73) & Blue
In each case, the voltage reading
should be 93-120 VDC. If the
voltage is not within normal range,
replace the computer board.
Code 611: Abnormal Fan Motor
This code indicates a fan motor fault.
1. Disconnect power to the water
heater by unplugging it from the
wall outlet or turning it off at the
circuit breaker.
2. Check venting for blockages or for
the presence of contaminants in
the water heater area (e.g., lint,
dust). Make sure that there are
no contaminants inside the water
heater cabinet. Correct any issues
20
•
On-Demand Water Heater Service Handbook for X3P Models
that are found.
3. Visually check for breakages in the
fan motor wiring or burn marks on
the computer board (PCB). Repair/
replace as needed.
4. Check for leaks at the heat
exchanger.
5. Check the fan housing for water.
6. Turn on power to the water heater,
then test the heater.
7. Complete this step only if the previous
steps did not solve the issue.
During operation, check the voltage
between the fan motor wires listed
below. The blue wire is common. (See
"FM" in the wiring diagram, page
28.)
•
Red & Blue
Normal: 132 to 192 VDC
(during operation)
•
Yellow & Blue
Normal: 13 to 17 VDC
(during operation)
•
Orange & Blue
Normal: 2 to 6.5 VDC
(during operation)
If the voltage readings fall within the
normal range, replace the fan motor.
If the voltage readings are not within
normal range, replace the computer
board.
Code 631: Pump Fault
1. Verify the check valve is operating
properly. This code appears when
water moves backwards through the
pump.
2. Check the filter on the return
connection and clean as necessary.
3. Inspect the pump for buildup or debris
in the connections that can reduce the
speed of the pump impeller. Clean out
the debris. Once re-installed make sure
the pump is not air locked.
4. Inspect the wires to the pump for any
cuts or breakage. Replace the wires if
they are compromised.
5. Complete this step only if the previous
steps did not solve the issue.
During operation, check the voltage
between the pump wires listed below.
The blue wire is common. (See
"PUMP" in the wiring diagram, page
28.)
•
Red & Blue
Normal: 132 to 192 VDC
(during operation)
•
Yellow & Blue
Normal: 13 to 17 VDC
(during operation)
•
Orange & Blue
Normal: 1.0 to 6.5 VDC
(during operation)
If the voltage readings fall within the
normal range, replace the pump. If the
voltage readings are not within normal
range, replace the computer board.
Code 651: Flow Adjustment Valve
Fault
This code indicates a flow adjustment
valve fault.
1. Inspect the flow adjustment valve
(item number 402, p. 73) for the
following:
•
Broken or disconnected wires
•
Debris or scale buildup inside the
valve assembly that would prevent
the valve from opening or closing
•
Water leakage at the flow
adjustment valve (Replace the
seals/component.)
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