GLAS
Cool Call Not Reaching Condenser
Thermostat calls for cooling but the outdoor AC unit does not start; indoor blower may run.
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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 Y wire, Tripped outdoor unit breaker or disconnect, Low‑pressure or high‑pressure safety switch open, Failed contactor coil in condenser
How to Fix / Troubleshooting
Safety warning: High voltage present at outdoor unit. Turn off power at the outdoor disconnect and indoor breaker before opening panels. Many AC issues require a licensed HVAC technician.
- Step 1 – Confirm GLAS cooling call: Ensure GLAS shows a cooling demand.
- Step 2 – Check Y wiring: Inspect Y at the GLAS wall plate and furnace/air‑handler board for secure connections.
- Step 3 – Check power to condenser: Verify the outdoor breaker and disconnect are on. Listen for any humming or clicking when GLAS calls for cool.
- Step 4 – Bypass test: With power on and caution, jumper R to Y at the furnace board. If the outdoor unit starts, the issue is between GLAS and the board. If it does not, the outdoor unit or its control circuit needs service.
- Step 5 – Call HVAC technician: If the condenser does not start with an R‑Y jumper, a technician should check the contactor, capacitor, and refrigerant safety switches.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Condenser Contactor Circuit or GLAS Main Control Board
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