Noritz Error Code 59: Overheating Abnormality

How to Fix Noritz Code 59

1. Check if any faucets are left partially open, which can restrict water flow and cause overheating.
2. If you recently installed or replaced a water filter, ensure it's not restricting water flow.
3. Contact a licensed HVAC technician for a thorough inspection and repair.

How to Reset Noritz Code 59

1. Turn off the unit using the power button on the front panel.
2. Turn off the gas supply valve.
3. Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
4. Restore power at the breaker, then open the gas valve.
5. Turn the unit back on. If the error returns, the underlying issue needs repair.

Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.

What Does Noritz Error Code 59 Mean?

Error code 59 on your Noritz water heater indicates an overheating condition. This could be due to a faulty temperature sensor or a problem with the heating element. While the unit is still functional, it's important to address this issue to prevent further damage or safety risks. Keep using your water heater, but monitor it closely.

Common Causes

• Faulty temperature sensor
• Problem with the heating element
• Air in the water lines causing overheating
• Incorrect water flow rate

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Noritz model families as 59.