Rheem RTGH-RH11DV Use And Care Manual page 68

Error Code Error Code Description
Operating Temperature Sen-
sor or DHW Sensor detects
Er:16
Water Temperature Greater
than 199°F (93°C)
High Limit Overheat Switch
Er:20 – Closed is Normal, Open is
APS/Condensate – Closed
Er:29 is Normal, Open is Fault
(Condensate Drain Trap)
Water Inlet Sensor Open or
Er:31
Water Outlet Sensor Open or
Er:32
H/X Temperature Sensor
Er:33
Open or Short
Exhaust Sensor Open or
Er:35
Flame Detected after Exiting
Er:39
a Flame On Condition
Gas Leakage continuously
detected for 10 Minutes, or
Er:40 three times within One Hour
(Greater than 5 Seconds
Each Time)
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 flowing 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.
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.
Fault
3. If the problem persists, replace the main control.
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.
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.
Short
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.
Short
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.
Short 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.
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 sensor 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 quali-
fied 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.
Possible Remedies
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AP18733 REV. 3.2.17