73 🟡 Repair Required
Noritz Error Code 73: Circuit Board Setting Error
⚠️ Your Noritz water heater is experiencing a circuit board setting error, which has caused it to shut down. It's safe to troubleshoot, but don't attempt any repairs yourself.
How to Fix Noritz Code 73
- Step 1: Turn off the power to your Noritz water heater at the circuit breaker.
- Step 2: Wait for 30 seconds, then turn the power back on. The unit should reset and try to boot up.
- Step 3: If the error persists, or you hear unusual noises, call a professional HVAC technician.
What Does Noritz Error Code 73 Mean?
The Noritz 73 error code indicates a problem with the circuit board's settings. This could be due to a software glitch, a power surge, or a faulty component. The unit has entered a safe mode and shut down to prevent further damage. Before you call a professional, let's try a simple reset.
Common Causes of Noritz Code 73
- A power surge or fluctuation
- Software glitch due to a recent update or power outage
- Faulty component on the circuit board
Applicable Noritz Models
Need a Pro to Fix Noritz Code 73?
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 73
Circuit Board OEM: NR-CB-001