51 🟡 Repair Required
Noritz Error Code 51: Fan Motor Failure
⚠️ Your Noritz water heater's fan motor has failed, causing the system to shut down. This is not an immediate safety risk, but it does require professional repair.
How to Fix Noritz Code 51
- Check if the power switch is turned on and the circuit breaker is in the ON position
- Listen for any unusual noises coming from the unit, which could indicate a different issue
- Contact a licensed HVAC technician for a professional diagnosis and repair
What Does Noritz Error Code 51 Mean?
The Noritz 51 error code indicates that the fan motor in your condensing tankless water heater has stopped working. This motor is responsible for drawing combustion air into the unit and exhausting the byproducts of combustion out. When it fails, the system automatically shuts down to prevent any potential safety hazards. This error is not typically caused by a simple power issue; it's usually due to a faulty motor or a problem with the motor's control circuit.
Common Causes of Noritz Code 51
- Fan motor failure due to wear and tear over time
- Electronic control circuit failure, causing the motor to stop receiving power
- Blockage in the venting system, causing the motor to overheat and fail
- Incorrect installation or improper venting, leading to excessive motor strain
Applicable Noritz Models
Need a Pro to Fix Noritz Code 51?
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 51
Fan Motor Assembly OEM: NOR-100000026
Control Circuit Board OEM: NOR-100000035