What should you do first?
Confirm the thermostat is in the correct mode, check the filter, and give the system time to respond. Light outdoor frost can be normal, but heavy persistent ice, a unit that never completes defrost, repeated breaker trips, or no temperature change needs diagnosis.
Overview
Use this guide to distinguish an electricity-supply interruption from a heat-pump problem, identify safe observations and know when to request professional diagnosis. HVAC Repair Dispatch connects homeowners with independent providers for new residential repair requests. Utility outages go to your electricity provider; repair coverage, appointment timing and pricing must be confirmed with the service provider.
Safe observations
- Confirm Heat, Cool, or Emergency Heat has not been selected accidentally
- Check the filter and open vents
- Observe whether the outdoor fan operates and whether frost is light or heavy
- Note if auxiliary heat stays on continuously or the system cycles rapidly
Warning signs and stop conditions
- Heavy ice that does not clear
- Breaker trips, burning odor, or loud electrical buzzing
- Outdoor fan not turning while the compressor appears to run
- No heat during freezing conditions
- Water or ice creating an electrical or slip hazard
What not to do
- Do not open equipment panels, touch wiring or work on refrigerant components. Leave internal electrical and refrigerant diagnosis to a qualified HVAC professional.
- Do not chip ice from the outdoor coil or use force to free a frozen component. Follow the equipment instructions and arrange diagnosis if ice does not clear.
- Do not keep resetting a breaker that trips repeatedly or repeatedly restart a faulty heat pump. Have the cause diagnosed before returning it to use.
Possible causes
Airflow or indoor-unit issue
A filter, coil, blower, or duct problem can reduce both heating and cooling performance.
Defrost or outdoor control fault
Sensors, boards, valves, motors, and controls manage cold-weather operation and can allow excessive ice when they fail.
Refrigerant or compressor fault
Leaks, reversing-valve problems, metering faults, and compressor issues require professional instruments and training.
Professional diagnostic context
- Operating mode and thermostat configuration
- Airflow and temperature change
- Defrost sensors, board, outdoor coil, and fan
- Electrical components and compressor operation
- Refrigerant-side performance and reversing-valve behavior
What an estimate should explain
- The system type, capacity, age, and accessibility
- The failed component and whether compatible parts are available
- Diagnostic or service-call fees in the local market
- After-hours timing and current provider availability
- Refrigerant type, electrical work, and any additional testing required
Repair and replacement decisions
Repair often makes sense for a specific control, sensor, motor, or airflow fault. Compare replacement when a major sealed-system failure combines with age, recurring repairs, poor efficiency, or limited part availability.
Questions and answers
Is frost on a heat pump always a problem?
No. Light frost can be normal and should clear during defrost. Thick ice that persists or returns quickly can indicate an airflow, defrost, control, or refrigerant problem.
Why does heat-pump air feel less hot than furnace air?
Heat pumps often deliver a lower supply-air temperature for longer periods. The key question is whether the home reaches and maintains the thermostat setpoint.
Should I switch to emergency heat?
Use it according to the equipment or thermostat instructions, usually when the outdoor unit cannot operate. It may cost more to run and does not replace diagnosis.
Can a heat pump be repaired in winter?
Yes, subject to diagnosis, weather-safe working conditions, parts, and provider availability.
Repair scenarios
- Power is out beyond the heat pump: check your electricity provider’s outage information and report the loss of supply to that utility. A neighbor having power does not rule out an isolated outage. Stay away from damaged wires. For smoke, fire or immediate danger, leave and call 911 from safety.
- Power is on, but heating pauses: a brief period of cooler air can occur during defrost. Follow your model’s operating instructions and the frost guidance above. If heat does not return, ice persists or a breaker trips repeatedly, arrange professional diagnosis. Do not open panels, chip ice or repeatedly restart the equipment.
- Murfreesboro utility route: the city lists Middle Tennessee Electric as its electric service provider. Use MTE’s Service Concerns page for outage information and reporting. The HVAC repair referral number below is separate from MTE and cannot restore utility power.
- Requesting heat-pump repair: call (855) 559-5060 with your property ZIP, when the problem began and whether household power is affected. This line connects homeowners and authorized decision-makers seeking a new residential repair with independent providers. Coverage, appointment timing and pricing must be confirmed. An appointment or repair is not guaranteed.
- Coverage check, October 10, 2026: the supplied coverage list includes Murfreesboro ZIP codes 37128 and 37130. ZIP-list inclusion does not establish current provider availability. Confirm your exact property location and heat-pump service needs during the call.