Error Code 76; Error Code 79; Error Code 80/81; Error Code 82 - Rheem RTG2-42 Troubleshooting Manual

Error Code 76

Explanation: Communication Fault with Remote Control. At a minimum check the following:
1. Check remote control wiring for loose or damaged connections.
2. Bypass remote control cable by connecting remote control directly to remote control
terminals on PCB. Replace cable if found to be faulty.
Remove remote control wires from wiring terminal on the PCB. Plug unit in and open a hot water source.
Did the unit go
to main burner?
Yes

Error Code 79

Explanation: Fan Motor Current fault. Fan motor does not work properly. At a minimum check
the following:
1. Ensure fan motor will turn freely. Motor will operate with a small amount of restriction.
2. Check fan motor for presence of moisture of condensation.
3. Check wiring harness to motor for damaged and/or loose connections.
See and follow the same procedure as used in Error Code 61.

Error Code 80/81

Explanation: Gas Cut-off Failure / Extinction Failure
See and follow the same procedure as used in Error Code 51.

Error Code 82

Explanation: Gas Type Control Data Failure; Printed Circuit Board data failure. The PCB has not
been programmed, lost its programming or has failed.
At a minimum check the following:
3. Check for the presence of the program chip installed on the PCB.
4. If the unit has operated for a period of time after installation, then the PCB was
programmed.
No
Replace the Printed Circuit Board
Either the wiring or the remote control is at fault.
To rule out the wiring, disconnect the remote control and use a short, good
jumper wire and connect directly to the remote terminal on the PCB.
If the unit works using the remote, then the wiring is at fault. If the unit does not
work, then the remote is at fault.
61
SVC 810 Tankless Troubleshooting Manual