American Standard TCWH-199-AS Installation Start-Up Maintenance Parts page 57

Error Code Description
Error Code
Er:31 Water Inlet Sensor Open or Short
Er:32 Water Outlet Sensor Open or Short
Er:33 H/X Temperature Sensor Open or Short
Exhaust Sensor Open or Short
Er:35
ER-38 Error Appears When Control Stores Data,
but Data is not Saved
Er:39 Flame Detected after Exiting a Flame On
Condition
Er:40 Gas Leakage is Detected in 10 Minutes, or
three times within One Hour (Greater than
5 Seconds Each Time)
Possible Remedies
This Error Code will go away when inlet water temperature decreases.
If Error happens again:
1. Check inlet water temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
This Error Code will go away when outlet water temperature decreases. If
Error happens again:
1. Check DHW outlet temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
This Error Code will go away when outlet water temperature decreases.
If Error happens again:
1. Check operating temperature sensor. Ensure connections are secure.
2. Check sensor resistance. If resistance is zero, replace the sensor.
3. If the problem persists, replace the main control.
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.
Press the Power button to clear the Error Code. Replace the main control.
This Error Code will go away when the false flame condition is remedied.
If Error happens again:
1. Check the water heater cover. Ensure it is secure. Flame detection sen-
sor can detect an external light source.
2. Check flame detection sensor. Ensure connections are secure. Normal
operating settings are more than 2.5DC before ignition, less than 2.5DC
after ignition.
3. If the problem persists, replace the main control.
IMPORTANT: If you smell gas, STOP! Follow the instructions on page 2, this
manual, and call a qualified service technician or the fuel gas utility. Press
the Power button to clear the Error Code. If Error happens again:
1. Check the water heater cover. Ensure it is secure.
2. Check gas connections for leakage with a soapy solution. Fix any leaks.
3. Check condition of the burner assembly.
4. If the problem persists, replace the main control.
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