Mysa Localized Overheating / Terminal Damage

Thermostat emits a faint electrical smell or shows discoloration around terminals.

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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

Loose terminal screw causing arcing, Overloaded heater circuit, Damaged insulation at connection point

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker immediately. Do not continue using a thermostat that smells burnt or shows discoloration.

Steps to inspect:

  • Remove thermostat: With power OFF, remove the thermostat and inspect the LINE and LOAD terminals and surrounding plastic.
  • Check wire condition: Look for charred or brittle insulation. Cut back to clean copper and re-strip if necessary.
  • Verify load rating: Ensure the connected heater load does not exceed the thermostat’s maximum current rating.

If the thermostat body or terminals are discolored or melted, replace the thermostat and correct any wiring or load issues before restoring power.

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Repair Difficulty

Hard 4/5

Required Part

Terminal Block / Main Control Board
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