Maintenance - Rinnai RUC80i Training Program

Maintenance:

A fault code will flash on the temperature controller when a fault is detected. The unit may stop
operating (code dependent). Not all codes are applicable to all models. See the owners manual
or tech sheet for codes specific to your particular model water heater.
ERROR
02 No burner operation during freeze protection mode
03 Power interruption during Bath Fill
05
Air supply or Exhaust Blockage
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PROPRIETARY and CONFIDENTIAL
Fault Codes.
FAULT
Bypass Servo failure
No Ignition
Enhancing Lives By Changing The Way Water Is Heated
- Service Call
- Turn off all hot water tap. Disable bath fill, turn unit OFF then back ON.
- Replace bypass servo.
- Ensure Rinnai approved venting materials are being used.
- Check that nothing is blocking the flue inlet or exhaust.
- Check all vent components for proper connections.
- Ensure vent length is well within limits.
- Check Burner Sensor / TC sensor or air temperature thermistor (indoor non-
condensing models.
- Verify DIP switches are set properly .
- Check fan or burners for blockage .
- Check that the gas is turned on at the water heater, gas meter, or cylinder.
- If the system is Propane, ensure the tank has adequate quantity.
- Ensure the appliance and circuit board is grounded properly.
- Ensure gas type and gas pressure is correct.
- Ensure gas line, gas meter and /or regulator is sized properly.
- Bleed all air from the gas lines.
- Verify dip switches are set correctly.
- Ensure the igniter electrode is operational.
- Check gas solenoid valves for open or short circuits.
- Remove burner cover to ensure burners are properly seated.
- Remove burner plate and inspect burner surface for condensation / debris.
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REMEDY
(Continued on next page)
5/4/2018