Noritz Inadequate Cooling / Internal Overheating

Boiler cabinet is excessively hot to the touch during operation.

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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

Blocked air passages, Insulation damage, Fan not moving enough air, High ambient temperature around boiler

How to Fix / Troubleshooting

Safety: Turn OFF power and allow the boiler to cool before opening the cabinet.

  • 1. Clear area around boiler: Ensure there is adequate clearance around the Noritz boiler and that vents or louvers on the cabinet are not blocked by storage items.
  • 2. Inspect internal airflow: Check that internal baffles and insulation are intact and not obstructing airflow.
  • 3. Verify fan operation: Confirm the combustion fan runs smoothly and that no panels are missing that would alter airflow.
  • 4. Professional inspection: If overheating persists, a technician should check for improper installation, damaged insulation, or incorrect venting.
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Repair Difficulty

Medium 3/5

Required Part

Combustion Fan Motor Assembly
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