Noritz Error Code 52: Exhaust Blockage
Warning: Your Noritz water heater has detected an exhaust blockage, which could lead to carbon monoxide buildup. Turn off the unit immediately and call a professional.
How to Fix Noritz Code 52
- Step 1: Turn off the power to the water heater at the circuit breaker
- Step 2: Contact a licensed HVAC technician to diagnose and fix the issue
- Step 3: Do not attempt to operate the unit until a professional has resolved the issue
How to Reset Noritz Code 52
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
What does 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.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Exhaust Vent Kit | NOR-EXVKIT | — |
| Draft Inducer Fan | NOR-DIFAN | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 10 | Flame Failure | Warning |
| 11 | Ignition Failure | Warning |
| 12 | Flame Loss | Warning |
| 14 | Thermal Fuse Failure | Warning |
| 16 | Over-Temperature | Warning |
| 29 | Condensate Drain Issue | Warning |
| 31 | Inlet Thermistor Failure | Warning |
| 32 | Outlet Thermistor Failure | Warning |
| 33 | Heat Exchanger Thermistor Failure | Warning |
| 43 | Water Level/Neutralizer Issue | Warning |