66 🟡 Repair Required
Noritz Error Code 66: Bypass Flow Control Valve Failure
⚠️ Your Noritz water heater is locked out due to a potential safety issue. Do not attempt to fix it yourself.
How to Fix Noritz Code 66
- Step 1: Turn off the power to your water heater at the circuit breaker.
- Step 2: Contact 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 66 Mean?
Error code 66 on your Noritz water heater indicates a failure in the bypass flow control valve. This valve is responsible for regulating water flow through the heat exchanger. If it fails, it can cause the water heater to overheat, posing a safety risk. The water heater will shut down to prevent any potential hazards.
Common Causes of Noritz Code 66
- Wear and tear on the bypass flow control valve
- Mineral buildup or debris blocking the valve
- Incorrect water pressure
- Faulty valve due to manufacturing defect
Applicable Noritz Models
Need a Pro to Fix Noritz Code 66?
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 66
Bypass Flow Control Valve OEM: NOR-123456