Rinnai RH180, Installation Fundamentals

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Maintenance Codes
55
Code Definition Remedy
16 Over temperature
warning (safety
shutdown because
unit is too hot). Check for restrictions in air flow around the unit and vent termination.
Licensed
professional
only
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
Check that the gas type being used is correct for the unit.
30 FV sensor
(flammable vapor)
Licensed
professional
only
Check sensor wiring for damage.
Measure resistance of sensor.
Replace sensor.
31 Burner Sensor.
32 Heat exchanger
outgoing temp.
thermistor.
Licensed
professional
only
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale buildup.
Replace sensor.
35 Tank temperature
thermistor.
Licensed
professional
only
Check sensor wiring for damage.
Measure resistance of sensor.
Verify that sensor is properly mounted on the tank surface.
Replace sensor.