If your Honeywell thermostat displays a cooling call on the screen but your air conditioning unit refuses to turn on, the issue is typically caused by a tripped HVAC circuit breaker, a blown low-voltage fuse on the furnace control board, a delayed compressor protection timer, or misconfigured equipment settings. Additionally, check that your target temperature is set at least 3 degrees below the current room temperature. Safety Warning: Do not touch exposed electrical terminals inside the furnace housing while power is active. Verification: Listen for the outdoor condenser fan and compressor to start humming within 5 minutes of initiating a cooling call.
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