Goodman
Moisture Intrusion Affecting Thermostat Operation
Thermostat backplate or wall area shows signs of condensation or water damage
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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
Cold exterior wall behind thermostat, High indoor humidity, Air leakage through wall cavity, Water leak from above
How to Fix / Troubleshooting
Safety first: Turn off power to the furnace/air handler before removing the thermostat if there is visible moisture near wiring.
Steps to address moisture issues:
- 1. Remove thermostat: Take the thermostat off the sub-base and inspect for moisture, corrosion, or rust on terminals.
- 2. Dry area: Allow the wall cavity and thermostat to dry completely. Use gentle airflow; do not use high heat.
- 3. Seal wall opening: Seal gaps around the thermostat cable with foam or putty to prevent humid air from entering the wall cavity.
- 4. Improve insulation: If the thermostat is on an exterior wall, add insulation behind the sub-base or relocate the thermostat to an interior wall.
- 5. Address leaks: If water is entering from above or behind, locate and repair the source (roof, plumbing, or condensation issues).
- 6. Replace damaged thermostat: If corrosion is present on the thermostat terminals or PCB, replace the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Goodman smart thermostat (complete assembly)
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