Rheem RTGH-RH10DV Service Manual page 78

78
Error code
It occurs when exhaust gas emission is faulty due to exhaust flue blockage.
When excessive amount of gas inflows due to higher set of dip switch than its hot water heater capacity,
exhaust gas temperature will increase more than excess temperature. Exhaust gas temperature may be
high due to heat exchanger's malfunction.
① Turn off the water heater for at least 30 minutes, and then restart it.
Meaning
Exhaust temperature exceeds
selected cutoff temperature.
(Manual restore)
Failure event
Check point
② Check Exhaust Thermistor's wiring connected at exhaust
duct is disconnected. And check circuit boards socket.
(CN7 : White ⑤, Blue ⑫)
③ Check for any obstructions in the vent pipe.
Chapter 4 Troubleshooting
Condition
Overheating Exhaust Thermistor
(The water heater shuts down
when the exhaust temperature
exceeds 149°F (65°C).)