Instructions / Assembly

AP18733 REV. 3.2.17
69
Error Code Error Code Description Possible Remedies
Er:16
Operating Temperature Sen-
sor or DHW Sensor detects
Water Temperature Greater
than 199°F (93°C)
This Error Code will go away when the DHW temperature decreases.
If Error happens again:
1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal
operation.
2. Check if DHW pipe is blocked. Ensure there is enough water owing to the water heater.
3. Check DHW sensor at DHW outlet. If resistance is zero, replace the sensor.
4. Check Operating Temperature sensor at the heat exchanger. If resistance is zero, replace
the sensor.
5. If the problem persists, replace the main control.
Er:20
High Limit Overheat Switch
– Closed is Normal, Open is
Fault
Press the Power button to clear the Error Code.
1. Inspect the High Limit Overheat switch. Ensure proper connections.
2. Check High Limit Overheat switch resistance. If resistance is zero, replace the switch.
3. If the problem persists, replace the main control.
Er:29
APS/Condensate – Closed
is Normal, Open is Fault
(Condensate Drain Trap)
Press the Power button to clear the Error Code.
1. Check APS/Condensate and main controller connections. Ensure all are secure.
2. Check APS/Condensate resistance. If resistance is zero, replace the switch.
3. Check APS/Condensate hose. Ensure it is connected and in good condition.
4. Check condensate line and termination for blockages.
5. Check exhaust vent for blockages.
6. If the problem persists, replace the main control.
Er:31
Water Inlet Sensor Open or
Short
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.
Er:32
Water Outlet Sensor Open or
Short
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.
Er:33
H/X Temperature Sensor
Open or Short
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.
Er:35
Exhaust 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:39
Flame Detected after Exiting
a Flame On Condition
This Error Code will go away when the false ame condition is remedied.
If Error happens again:
1. Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external
light source.
2. Check ame 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.
Er:40
Gas Leakage continuously
detected for 10 Minutes, or
three times within One Hour
(Greater than 5 Seconds
Each Time)
IMPORTANT: If you smell gas, STOP! Follow the instructions on page 2, this manual, and call a quali-
ed 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.
Error Code Error Code Description Possible Remedies
Er:41
Fan Speed too High with
Flame On
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: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 zero, replace the switch.
3. If the problem persists, replace the main control.
Er:44 Recirculation Abnormality
Press the Power button to clear the Error Code.
If Error happens again:
1. Ensure water heater inlet and outlets are open and water is supplied to the water heater.
2. Check the pump operation.
3. If it doesn’t work, ensure wiring connections to pump.
4. If even supply power to pump and doesn’t run it replace the pump.
If Error happens again:
1. Verify recirculation loop length is within specication. Air purge is not enough.
2. Too much restriction on recirculation loop.
3. Return loops are clogged.
4. Check the recirculation loop condition
Er:45 Water Leak
1. Turn power off to the water heater.
2. Valve off the water heater to isolate it from the system.
3. Call a qualied service technician to diagnose and repair the source of the leak.
Er:60
Hot Water Temperature
Abnormality
Press the Power button to clear the Error Code.
If Error happens again:
1. Ensure water heater inlet and outlets are open and water is supplied to the water heater.
If Error happens again:
1. Ensure water heater inlet and outlets are open and water is supplied to the water heater.
2. Check the pump operation.
3. If it doesn’t work, ensure wiring connections to pump.
4. If even supply power to pump and doesn’t run it, replace the pump.
If Error happens again:
1. Verify recirculation loop length is within specication. Air purge is not enough.
2. Too much restriction on recirculation loop.
3. Return loops are clogged.
4. Check the recirculation loop condition.
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 DC15~30V power at the fan
connection. If DC15~30V power is present at the control, replace the fan. If the blower does not
have DC15~30V power, check power at the control. If DC15~30V power is not present at the control,
replace the control.
3. If the problem persists, replace the main control.
Er:65 Supply Water 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 supply water valve. Ensure all are secure.
3. Replace supply water valve.
4. If the problem persists, replace the main control.
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.