31 🟡 Repair Required
Noritz Error Code 31: Inlet Thermistor Failure
⚠️ Your Noritz water heater is experiencing a safety issue and needs professional repair.
How to Fix Noritz Code 31
- Step 1: Turn off the power to your water heater at the circuit breaker.
- Step 2: Contact a licensed HVAC technician for repair. Do not attempt to fix this issue yourself.
- Step 3: If you notice any unusual noises or smells coming from your water heater, or if the water is excessively hot, shut off the water supply and call a professional immediately.
What Does Noritz Error Code 31 Mean?
The Noritz 31 error code indicates a failure in the inlet thermistor, a crucial temperature sensor in your water heater. This component helps maintain the correct water temperature. Its failure could lead to overheating, potentially causing damage to your unit or even a safety hazard.
Common Causes of Noritz Code 31
- Faulty inlet thermistor
- Wiring issue between the thermistor and the control board
- Control board malfunction
Applicable Noritz Models
Need a Pro to Fix Noritz Code 31?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Noritz Tankless Water Heater Code 31
Inlet Thermistor OEM: NOR-0012345
Control Board OEM: NOR-6789012