Fault Condition: No burner operation during freeze protection mode
Item to check : Service Call
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Fault Condition: Power interruption during Bath fill (Water will not flow when power returns)
Item to check : Turn off all hot water taps. Press ON/OFF twice.
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Fault Condition: Air Supply or Exhaust Blockage
• 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 within limits.
• Ensure condensation collar was installed correctly.
• Verify dip switches are set properly.
• Check fan for blockage.
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Fault Condition: No Ignition
• Check that the gas is turned on at the water heater, gas meter, or cylinder. • Ensure gas type and pressure is correct.
• Ensure gas line, meter, and/or regulator is sized properly.
• Bleed all air from gas lines.
• Verify dip switches are set properly.
• Ensure appliance is properly grounded.
• Disconnect EZConnect or MSA controls to isolate the problem.
• Ensure igniter is operational.
• Check igniter wiring harness for damage.
• Check gas solenoid valves for open or short circuits.
• Remove burner cover and ensure all burners are properly seated.
• Remove burner plate and inspect burner surface for condensation or debris.
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Fault Condition: Flame failure
• Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue outlet.
• Ensure gas line, meter, and/or regulator is sized properly.
• Ensure gas type and pressure is correct.
• Bleed all air from gas lines.
• Ensure proper Rinnai venting material was installed.
• Ensure condensation collar was installed properly.
• Ensure vent length is within limits.
• Verify dip switches are set properly.
• Ensure appliance is properly grounded.
• Disconnect keypad.
• Disconnect EZConnect or MSA controls to isolate the problem.
• Check power supply for loose connections.
• Check power supply for proper voltage and voltage drops.
• Ensure flame rod wire is connected.
• Check flame rod for carbon build-up.
• Disconnect and re-connect all wiring harnesses on unit and PC board. • Check all components for electrical short.
• Check gas solenoid valves for open or short circuits.
• Remove burner plate and inspect burner surface for condensation or debris. • Check the ground wire for the PC Board.
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Fault Condition: Thermal Fuse
• Check gas type of unit and ensure it matches gas type being used.
• Check for restrictions in air flow around unit and vent terminal.
• Check for low water flow in a circulating system causing shortcycling.
• Ensure dip switches are set to the proper position.
• Check for foreign materials in combustion chamber and/or exhaust piping. • Check heat exchanger for cracks and/or separations.
• Check heat exchanger surface for hot spots which indicate blockage due to scale build up. Refer to instructions 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
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Fault Condition: Over Temperature Warning
• Check for restrictions in air flow around unit and vent terminal.
• Check for low water flow in a circulating system causing shortcycling.
• Check for foreign materials in combustion chamber and/or exhaust piping. • Check for clogged heat exchanger.
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Fault Condition: OBurner Sensor Error
• Measure resistance of sensor.
• Replace sensor
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Fault Condition: Outgoing Water Temperature Sensor Fault
• Check sensor wiring for damage.
• Measure resistance of sensor.
• Clean sensor of scale build up.
• Replace sensor.
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Fault Condition: (Nothing happens when water flow is activated.)
• Clean inlet water supply filter.
• On new installations ensure hot and cold water lines are not reversed.
• Check for bleed over. Isolate unit from building by turning off hot water line to building. Isolate the circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your plumbing.
• Ensure you have at least the minimum flow rate required to fire unit.
• Ensure turbine spins freely.
• Measure the resistance of the water flow control sensor.
• Remote control does not light up but you have 12 VDC at the terminals for controls.
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Fault Condition: Heat Exchanger Outgoing Temperature Sensor Fault
• Check sensor wiring for damage.
• Measure resistance of sensor.
• Clean sensor of scale build up.
• Replace sensor.
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Fault Condition: Combustion Air Temperature Sensor Fault
• Check for restrictions in air flow around unit and vent terminal.
• Check sensor wiring for damage.
• Measure resistance of sensor.
• Clean sensor of scale build up.
• Ensure fan blade is tight on motor shaft and is in good condition.
• Replace sensor.
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Fault Condition: Modulating Solenoid Valve Signal Abnormal
• Check modulating gas solenoid valve wiring harness for loose or damage terminals. • Measure resistance of valve coil.
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Fault Condition: Combustion Fan Failure
• Ensure fan will turn freely.
• Check wiring harness to motor for damaged and/or loose connections.
• Measure resistance of motor winding.
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Fault Condition: Water Flow Servo Faulty (does not stop flow properly)
Item to check : If blank screen is present on remote control then the flow control has shorted out. Unplug flow control. If remote lights up and unit starts operating then replace flow control assembly.
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Fault Condition: SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault
Item to check : Replace the PC Board.
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Fault Condition: Flame Sensing Device Fault
• Ensure flame rod is touching flame when unit fires.
• Check all wiring to flame rod for damage.
• 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.
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Fault Condition: Burner Sensor Circuit Error
• Check sensor wiring and PCB for damage.
• Replace sensor
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Fault Condition: Scale Build-up in Heat Exchanger (when checking maintenance code history “00” is substituted for “LC”)
• Flush heat exchanger. Refer to instructions in manual.
• Replace heat exchanger.
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