TP-Link Kasa
Electrical Noise or Voltage Sag Affecting Wi‑Fi Module
Thermostat intermittently loses connection to Kasa app when HVAC equipment starts
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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
Voltage drop on 24V when blower or compressor starts, Poor transformer regulation, Loose R/C connections, Electrical interference from motors
How to Fix / Troubleshooting
Safety: Turn off power before tightening wiring.
- Tighten low-voltage wiring: At thermostat and furnace board, ensure all low-voltage connections are secure.
- Separate cables: Keep thermostat cable away from high-voltage lines and motor leads where possible.
- Transformer check: Have a technician measure 24V under load to ensure it does not sag excessively when equipment starts.
- Wi‑Fi extender: Improve Wi‑Fi signal strength near the thermostat to make the connection more tolerant of brief disturbances.
- Replace thermostat: If power is stable but Wi‑Fi still drops only when equipment starts, the thermostat’s Wi‑Fi module may be overly sensitive and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
24V Transformer / Thermostat Wi‑Fi Module
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