71
Noritz Gas Valve Drive Circuit Fault

Error code 71 displayed; unit may not operate.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted gas valve coil, PCB gas valve driver failure, Wiring short between PCB and gas valve, Incorrect gas valve wiring

How to Fix / Troubleshooting

Safety first: Turn OFF gas and power. Gas system work must be done by a licensed professional.

Steps to check and correct (for technicians):

  • Inspect wiring: Check the gas valve harness for shorts to ground, damaged insulation, or loose connectors.
  • Test gas valve coil: Measure resistance and compare to Noritz specs. Replace the gas valve assembly if shorted or open.
  • Check PCB output: If the valve tests good, the PCB gas valve driver may be damaged and require board replacement.

Homeowner note: Do not attempt to test or replace gas valve components yourself; contact a Noritz-authorized technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Gas Valve Assembly
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