Noritz Error Code 70: Circuit Board Fault

How to Fix Noritz Code 70

1. Step 1: Turn off the power to the water heater at the circuit breaker for safety
2. Step 2: Check for any visible damage to the circuit board, such as burn marks or corrosion
3. Step 3: If you're comfortable with electrical work, you can try replacing the circuit board with a new one. If not, call a professional

How to Reset Noritz Code 70

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 70 Mean?

The Noritz 70 error code indicates a fault with the circuit board, which controls the water heater's operation. This could be due to a short circuit, open circuit, or other electrical issue. The heater will display this error and shut down to protect itself and your home from potential damage. While it's safe to troubleshoot, it's important to know what you're doing to avoid causing further issues or injury.

Common Causes

• A short circuit or open circuit on the circuit board
• Corrosion or damage to the circuit board due to moisture or age
• A faulty component on the circuit board, such as a resistor or capacitor

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Noritz model families as 70.