Rinnai RH180 Operation And Installation Manual page 36

Code Defini on
14 Thermal Fuse
16 Over Temperature
Warning (safety
shutdown because unit
is too hot)
30 FV Sensor
31 Burner Sensor
32 Heat Exchanger
Outgoing Temperature
Sensor
35 Tank Temperature
Sensor
38 CO or FV Sensor
52 Modula ng Solenoid
Valve Signal
61 Combus on Fan
63 Circula on flow rate
has dropped below 1.3
gpm
71 SV0, SV1, SV2, SV3
Solenoid Valve Circuit
Fault
72 Flame Sensing Device
73 Burner Sensor Circuit
No No hot water, no light
code or error code on the
display
36
Remedy
Check for restric ons in air flow around unit and vent terminal.
licensed Check gas type of unit and ensure it matches gas type being used.
professional only Ensure dip switches are set to the proper posi on.
Check for foreign materials in combus on chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separa ons.
Check heat exchanger surface for hot spots which indicate blockage due to scale
build-up. Refer to instruc ons in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
Check for restric ons in air flow around unit and vent terminal.
licensed Check for foreign materials in combus on chamber and/or exhaust piping.
Check for clogged heat exchanger.
professional only
Check that the gas type being used it correct for your unit.
Check sensor wiring for damage.
Measure resistance of sensor.
Replace sensor
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Verify that sensor is properly posi oned on the tank surface.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Replace sensor.
Check modula ng gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connec ons.
Measure resistance of motor winding.
Check water filter for blockage
Check pump opera on and wiring
Clean Heat Exchanger
Check wiring harness to all solenoids for damage and/or loose connec ons.
Measure resistance of each solenoid valve coil.
Verify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
Check sensor wiring and PCB for damage.
Replace sensor.
Confirm the water heater is plugged in and 120 volts is available
RH180 Manual