Atlantic
Excessive Internal Heating
Thermostat backplate or housing feels unusually warm to the touch.
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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
Overloaded internal relay switching high current, Thermostat installed on warm flue or hot wall, Poor ventilation around unit, Failing power component on PCB
How to Fix / Troubleshooting
Safety first: Turn off power to the thermostat and connected heating circuits before inspection.
- Step 1 – Check load rating: Confirm that the connected electric heating load does not exceed the thermostat’s maximum current rating. If it does, install an external contactor and use the thermostat only to drive the contactor coil.
- Step 2 – Inspect mounting surface: Ensure the thermostat is not mounted on a hot chimney breast or above a heat source. Relocate if necessary.
- Step 3 – Ventilation: Make sure curtains or covers are not blocking airflow around the thermostat.
- Step 4 – Internal inspection: With power off, remove the thermostat and inspect the PCB for discoloration or burnt components. If found, replace the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB / Output Relay
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