73
Noritz
Parameter Setting / Dip Switch Conflict
Error code 73 displayed; unit may not operate after service or configuration changes.
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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 configuration, Incompatible remote controller settings, PCB not configured for installed venting or gas type, Multi-unit system misconfiguration
How to Fix / Troubleshooting
Safety first: Turn OFF power before changing any dip switches or configuration settings.
Steps to check and correct:
- Review installation manual: Locate the dip switch configuration table for your exact Noritz model.
- Verify all dip switches: Check each switch position against the required settings for gas type, altitude, venting, and system type (single vs multi-unit). Correct any discrepancies.
- Check remote settings: Ensure the remote controller is compatible and configured correctly for the heater model.
- Power reset: After adjustments, turn power off for several minutes, then restore and test.
- Professional help: If error 73 remains, a Noritz technician may need to reinitialize or replace the PCB.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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