A heat pump that completely fails to come on or respond to thermostat controls is usually experiencing an electrical power interruption or a safety control lockout. Common culprits include a tripped electrical circuit breaker in your home panel dedicated to either the indoor air handler or the outdoor condensing unit, or a blown low-voltage control fuse on the indoor control board. Another frequent cause is a loose service access panel door that leaves safety interlock switches open. Additionally, a malfunctioning or unpowered wall thermostat with dead batteries or broken wiring can fail to send control signals. System safety switches, such as high-pressure cutoffs or condensate float switches, will also prevent startup. You can verify power restoration by checking breakers and verifying that the thermostat display screen is active.
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