When your residential HVAC system's cooling mode turns on normally but the heating system refuses to engage, the malfunction is typically rooted in thermostat programming, control wiring faults, or fuel delivery issues. First, check your wall thermostat to ensure the system is switched explicitly to the "Heat" mode with a setpoint higher than current room temperature, and check for dead batteries. Second, verify that the circuit breakers supplying power to your furnace or heat pump are not tripped. Third, if you have a gas furnace, ensure the main gas valve is open and check the electronic ignition or pilot light. You can troubleshoot electrical power using a multimeter. You can verify that your corrective actions were successful when resolving wiring faults or resetting equipment restores warm air.
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