A.O. Smith THR-160 Installation Instructions And Use & Care Manual page 61

Error
Error Type
Code
E403 Fan - Low Speed
Heat Exchanger - Water
E411
Overhea ng.
E412 PCB - Hardware
E413 Flame Sensor
E414 PCB-Flame Sensor Circuit
E415 Gas Valve Fault
E416 AD Value Fault
1. Check the fan motor wiring. Correct any loose connec ons and replace any dam-
aged wire/connector.
2. With the water heater power disconnected, check the exhaust vent and air
intake piping for any blockages. Remove any blockages.
3. If the error s ll occurs, contact a qualifi ed service technician.
1. Remove the heat exchanger thermistor (do not lose the o-ring) and check for any
dirt or debris. Clean with an emery cloth. If the thermistor is damaged, replace it.
2. Check the Thermistor sensor wire for a short or disconnec on. Correct any loose
connec ons and replace any damaged wire/connector. If the error s ll occurs,
contact a qualifi ed service technician.
1. Contact a qualifi ed service technician to replace the PCB.
1. Check the fl ame sensor wire for a short or disconnec on. Correct any loose con-
nec ons and replace any damaged wire/connector.
2. With the water heater power disconnected, check the exhaust vent and air
intake piping for any blockages. Remove any blockages.
3. Verify the water heater has suffi cient combus on air, reference the Combus on
and Ven ng Installa on sec on in the manual.
4. Check the installa on area for corrosive elements, reference the see Installa on
Environment sec on in the manual.
5. If the error s ll occurs, contact a qualifi ed service technician.
1. Check the fl ame sensor wire for a short or disconnec on. Correct any loose con-
nec ons and replace any damaged wire/connector.
2. If the error s ll occurs, contact a qualifi ed service technician to replace the PCB.
1. Check the gas valve wiring for a short or disconnec on. Correct any loose con-
nec ons and replace any damaged wire/connector.
2. If the error s ll occurs, contact a qualifi ed service technician.
1. Check the outlet thermistor sensor wire for a short or disconnec on. Correct
any loose connec ons and replace any damaged wire/connector. If the error s ll
occurs, contact a qualifi ed service technician.
2. Remove the outlet thermistor (do not lose the o-ring) and check for any dirt or
debris. Clean with an Emery cloth. If the thermistor is damaged, replace it.
3. If the error s ll occurs, contact a qualifi ed service technician to replace the PCB.
TROUBLESHOOTING
Procedure
Residen al Gas Water Heater Use and Care Guide • 61