70
Noritz
Internal PCB Configuration / Parameter Fault
Error code 70 appears; unit may not operate or may behave erratically.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect dip switch settings, Wrong PCB installed for model, Corrupted internal settings, Power surge damage
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas before adjusting any internal settings.
Steps to check and correct:
- Verify dip switch settings: Compare the dip switch positions on the PCB to the Noritz installation manual for your exact model and gas type. Correct any mismatched settings.
- Confirm PCB part number: Ensure the installed PCB matches the heater model. Using the wrong board can cause error 70.
- Power cycle: After correcting settings, turn power off for several minutes, then restore.
- Professional service: If error 70 persists, the PCB may be corrupted or damaged and should be replaced by a Noritz technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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