GLAS Overheating of Thermostat Electronics

Thermostat becomes very warm to the touch and may behave erratically.

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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

Installed over heat source or duct, Excessive backlight/brightness settings, Internal short or overcurrent on GLAS main board, Poor ventilation behind wall plate

How to Fix / Troubleshooting

Safety warning: If you smell burning or see smoke, turn off power to HVAC equipment immediately at the breaker and do not use the thermostat.

  • Step 1 – Check location: Ensure GLAS is not installed above a radiator, heat register, or other heat source.
  • Step 2 – Reduce brightness: In GLAS settings, lower screen brightness and disable always‑on display features.
  • Step 3 – Inspect wall box: If GLAS is mounted over an electrical box with high‑voltage wiring, consider relocating it to a low‑voltage‑only location.
  • Step 4 – Power cycle: Remove GLAS from the wall plate and allow it to cool. Reattach and monitor.
  • Step 5 – Replace thermostat: Persistent overheating suggests an internal fault. Replace the GLAS thermostat and have wiring inspected.
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Repair Difficulty

Medium 3/5

Required Part

GLAS Main Control Board
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