lp-672 Rev. 000 Rel. 002 Date 10.3.18
49
Error Code
Error Code Description
Possible Remedies
Er:35
Exhaust (Eh) Sensor Open or
Short
This Error Code will go away when exhaust temperature decreases.
If Error happens again:
1. Check exhaust temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. Check exhaust vent for blockage.
4. If the problem persists, replace the main control.
Er:37
Abnormal Supply Frequency
Supply frequency is too high to operate. This Error Code will go away when supply frequency returns to
normal operating range.
If Error happens again:
1. Ensure appliance is properly wired to a power source meeting the requirements on the rating plate.
2. If problem persists, replace the main control.
Er:38
Error Appears When Control
Stores Data, but Data is not
Saved
Press the Power button to clear the Error Code.
Replace the main control.
Er:41
Fan Speed too high with
flame on
The Error Code will go away unless it occurs five (5) times in ten (10) minutes. Press the Power button to
clear the Error Code.
If Error happens again:
1. Check the vent connections for blockages.
2. Check the burner assembly.
3. Check fan operation. If fan appears to be operating normally but RPMs are too low or too high, replace
the fan.
4. If the problem persists, replace the main control.
Er:42
Jumped Wire Disconnected
Press the Power button to clear the Error Code.
If Error happens again:
1. Ensure the jumped wire is properly connected.
2. If the problem persists, replace the main control.
Er:43
Burner overheat switch open
Press the Power button to clear the Error Code.
If Error happens again:
1. Check burner overheat switch connections. Ensure connections are secure.
2. Check switch resistance. If resistance is not zero, replace the switch.
3. If the problem persists, replace the main control.
Er:44
Air Pressure Sensor Fault
(Wiring Issue)
On Er:45 ONLY: The Error Code will go away unless it occurs five (5) times in ten (10) minutes.
Press the Power button to clear the Error Code.
1. Check APS and main controller connections. Ensure all are secure.
2. Check APS hose. Ensure it is connected and in good condition.
3. Check intake and exhaust vent for blockages.
4. Check condensate line and termination for blockages.
5. If the problem persists, replace the main control.
Er:45
Air Pressure Sensor
(Intake / Exhaust Blockage)
Er:46
Water Leak Detection Probe
Shorted
Error Code will go away when the water leak detection probe opens.
1. Ensure there is no water inside the bottom of the appliance cabinet. If there is water, find the leak source
and address the issue. After the issue has been addressed, clean the bottom of the cabinet and ensure the
probes are dry.
2. Check the wiring connection from the probe to the control board.
3. If the problem persists, replace the probe. If problem continues to persist, replace the control.
NOTE:
When this error occurs, the flow control valve will close the inlet water port until the code is reset.
Er:61
Fan Speed Feedback Signal
Abnormal
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check the connections to the fan. Ensure all are secure.
2. If the fan does not rotate during the ignition sequence, check for 8Vac 26.5Vac power at the fan con-
nection. If 8Vac 26.5Vac power is present at the control, replace the fan. If the blower does not have 8Vac
26.5Vac power, check power at the control. If 8Vac 26.5Vac power is not present at the control, replace the
control.
3. If the problem persists, replace the main control.
Er:64
Flow Control Valve Operation
Fault
Press the Power button to clear the Error Code.
If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water heater.
2. Check wiring connections to supply water valve. Ensure all are secure.
3. Replace supply water valve.
4. If the problem persists, replace the main control.
Er:65
Flow Control Valve Error
Er:66
Mixing Valve Error
Press the Power button to clear the Error Code.
If Error happens again:
1. Turn power OFF and ON at the main power switch internal to the water heater.
2. Check wiring connections to mixing valve. Ensure all are secure.
3. Replace mixing valve.
4. If the problem persists, replace the main control.
Er:68
Mixing Valve Zero Position
Fault