Noritz Error Code 52: Exhaust Blockage

How to Fix Noritz Code 52

1. Step 1: Turn off the power to the water heater at the circuit breaker
2. Step 2: Contact a licensed HVAC technician to diagnose and fix the issue
3. Step 3: Do not attempt to operate the unit until a professional has resolved the issue

How to Reset Noritz Code 52

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 52 Mean?

Error code 52 on your Noritz water heater indicates that the exhaust system is blocked, preventing proper venting. This could be due to a buildup of lint, dust, or other debris. The unit has automatically shut down to ensure safety. Do not attempt to operate the unit until the issue is resolved by a professional.

Common Causes

• Blockage in the exhaust vent due to lint, dust, or other debris
• Faulty draft inducer fan
• Incorrect venting configuration
• Blockage in the combustion chamber

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Noritz model families as 52.