Rheem TRITON GHE80SS Service Training Manual page 43

TROUBLESHOOTING ERROR CODES
Error A109 External CO Sensor Alarm
CO sensor detects carbon monoxide above the threshold limit. The unit does not come with a CO sensor. If the unit does not have one
wired directly to it then the configuration setup could be causing a false alarm.
• If there is an auxiliary CO Sensor connected to the unit,
follow the sensor manufacturer's instructions for checking
proper operation of the sensor.
• Confirm there are no exhaust leaks from loose vent con-
nections,
Error A110 & A111 Shut-off Valve Monthly Test Close/Open Error
These codes indicate that the monthly test of the automatic shut off valve (premium models only) was not completed properly. The valve
did not close in the allotted time. Every 30 days, the unit shuts the valve and opens it. If it doesn't see shut indication, these error codes will
occur.
• Drain the tank and remove the automatic shutoff valve.
Clean any debris from inside valve body and manually
rotate the ball valve to ensure the motor is not seized up.
• Reinstall the valve, fill the tank with water, and clear the
alarm. If issue persists replace the automatic shutoff valve.
Error A112 Shutoff Valve Not Open
• Confirm the Molex connectors from valve to water heater
wiring is securely connected.
• Confirm no wires are loose/damaged in Molex connectors
from valve to water heater.
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• From the front display tap the "Settings" button. Then tap
"configs". From the "config. settings" screen make sure the
auxiliary input select is set to "Flow Sensor". If this setting
is "CO Sensor" with no sensor connect, it can produce a
phantom A109 code.
• You can manually open and close the valve if the drive
motor has failed.
• Manually open the shutoff valve, clear the alarm. If the
alarm persists, replace the automatic shutoff valve.
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