Rinnai ByPass Servo - Code 70 Troubleshooting Procedure; PC Board Fault

32 11112014GW
Code 70 Troubleshooting Procedure
PC Board Fault
WARNING: Turn off the electrical, gas and water supply to the water heater before proceeding.
1. Check all wiring harnesses at the connection to the PC board to ensure they are not loose,
broken or damaged.
2. Check all dip switches to ensure they are set to the proper position.
3. Replace PC board.