Noritz Error Code 45: Water Leak Detected

How to Fix Noritz Code 45

1. Check all visible water supply pipes and connections for any signs of leaks or cracks.
2. Inspect the water inlet and outlet valves for any signs of wear or damage.
3. If you find a leak, turn off the water supply to that area and contact a professional immediately.

How to Reset Noritz Code 45

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 45 Mean?

When you see error code 45 on your Noritz tankless water heater, it means the unit has detected a water leak somewhere in the system. This could be due to a loose connection, a cracked pipe, or a faulty component. The heater has safely shut down to prevent further water damage. While it's still safe to use, it's important to have a professional inspect and repair the issue as soon as possible.

Common Causes

• A loose or cracked water supply pipe
• A faulty water inlet or outlet valve
• A leak in the heat exchanger or other internal component

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Noritz model families as 45.