71 🟡 Repair Required
Noritz Error Code 71: Gas Valve Drive Circuit Abnormality
⚠️ Your Noritz water heater is experiencing a gas valve drive circuit issue and has locked out to prevent safety hazards. Call a professional for repair.
How to Fix Noritz Code 71
- Step 1: Turn off the power to your water heater at the circuit breaker.
- Step 2: Call a licensed HVAC technician to diagnose and repair the issue.
- Step 3: Do not attempt to open the water heater or tamper with any internal components.
What Does Noritz Error Code 71 Mean?
Error code 71 on your Noritz water heater indicates a problem with the gas valve drive circuit. This circuit controls the gas valve that supplies fuel to the burner. When an abnormality is detected, the unit locks out to ensure safety. Common causes include electrical issues, such as a short circuit or open wire, or problems with the gas valve itself. Don't attempt to fix this issue yourself; always call a licensed technician.
Common Causes of Noritz Code 71
- Electrical short circuit or open wire in the gas valve drive circuit
- Faulty gas valve
- Wiring issues between the control board and gas valve
Applicable Noritz Models
Need a Pro to Fix Noritz Code 71?
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 71
Gas Valve Assembly OEM: GVA-120 (for NCB-120 series)
Control Board OEM: CB-120 (for NCB-120 series)