TP-Link Kasa
HVAC Equipment Not Responding to Thermostat Commands
The thermostat indicates heating or cooling is active, but the room temperature does not change.
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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
Failed furnace or AC equipment, Open safety switch in furnace, Tripped float switch in condensate line, Faulty furnace control board.
How to Fix / Troubleshooting
Safety: Do not bypass safety switches. Turn off power before opening equipment panels.
- Check airflow: Ensure the indoor blower runs when the thermostat calls for heat or cool. If it does not, the issue is in the furnace/air handler, not the thermostat.
- Filter and vents: Confirm the air filter is clean and supply/return vents are open.
- Condensate safety: Look for a full condensate pan or a tripped float switch that may be shutting down cooling.
- Equipment status lights: Observe LED status codes on the furnace or air handler control board and refer to its manual.
- Thermostat verification: A technician can jumper R to W or Y at the furnace board to confirm equipment operation. If the equipment fails even with a jumper, the fault is in the HVAC equipment, not the thermostat.
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Repair Difficulty
Professional Required
5/5
Required Part
Furnace Control Board / Air Handler Control Board (not the thermostat)
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