Meross Excessive Internal Heating

Thermostat or surrounding wall feels unusually warm to the touch during normal 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

High current load near maximum rating, Poor ventilation behind thermostat (insulated cavity), Loose terminal causing resistive heating

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker and allow the thermostat to cool before handling.

Steps:

  • Measure load: Calculate the total wattage of connected heaters and ensure it is within the thermostat's rating. If near the limit, consider using an external contactor.
  • Inspect terminals: Remove the thermostat and check for discoloration or melting around terminals. Tighten all screws and re-strip any darkened copper.
  • Improve ventilation: Avoid sealing the thermostat in foam insulation or airtight boxes. Provide some air space behind the unit.

Resolution: If overheating signs (burnt smell, discoloration) are present, replace the thermostat immediately and correct the load/wiring issue.

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Repair Difficulty

Medium 3/5

Required Part

Terminal Block and Internal Relay
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