Mysa Excessive Internal Heating / Overload

Thermostat or wall plate feels unusually hot to the touch during normal operation.

Advertisements

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.

Advertisements

Possible Causes

Heater load near or above maximum rating, Poor contact or loose terminal causing localized heating, Failing internal power components

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker immediately if you smell burning or see discoloration. Do not continue using an overheating thermostat.

Steps to inspect:

  • Check load rating: Confirm the total heater wattage on the circuit does not exceed the thermostat’s rated amperage.
  • Inspect terminals: With power OFF, remove the thermostat and check for loose screws, discolored insulation, or melted plastic at the LINE and LOAD terminals.
  • Tighten connections: Re-strip and firmly tighten any suspect connections.

If overheating signs are present on the thermostat body or PCB, replace the thermostat and correct any overload conditions before restoring power.

Advertisements

Repair Difficulty

Hard 4/5

Required Part

Terminal Block / Output Stage Components
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements