Heat Pump Not Heating

Professional Heat Pump Not Heating in Asheville & Western NC

Heat pumps that run in heating mode without delivering adequate warmth are a frequent issue during WNC's mountain winters — and the underlying causes differ from those of a gas furnace.

What Causes a Heat Pump Not to Heat

A heat pump does not burn fuel. Instead, it absorbs heat energy from outdoor air and transfers it indoors via a refrigerant cycle. When heating output drops, common causes include a stuck reversing valve preventing the switch to heating mode, low refrigerant due to a leak, a frozen outdoor unit caused by a malfunctioning defrost system, a failed compressor, a non-functional outdoor fan motor, or burned-out auxiliary heat strips (the electric backup that supplements heat on the coldest days).

Quick Things You Can Check

Make sure the thermostat is in 'heat' mode with the setpoint above the current room temperature. Inspect the outdoor unit — if ice has fully encased the coil, the defrost cycle is not functioning. Confirm the outdoor fan is spinning when the system calls for heat. Replace the air filter, because restricted airflow reduces heat transfer. Keep in mind that heat pumps deliver supply air at approximately 90-100°F, which feels noticeably cooler than furnace output (120-140°F). That is normal operation. However, if the air feels genuinely cool or the home cannot reach the set temperature, there is a problem.

When This Becomes a Serious Problem

Frequent switching to 'emergency heat' (sometimes labeled 'aux heat') means the heat pump cannot keep up on its own. Electric resistance backup strips consume 2-3x more electricity than the heat pump, driving your utility bill sharply higher. If the outdoor unit is icing over without defrosting, the accumulated ice will eventually bend coil fins and stress the compressor.

When to Call for Heat Pump Repair in Asheville

If the outdoor coil is covered in ice or the system cannot maintain temperature, call for service. Quality Mechanical provides heat pump repair in Asheville — our technicians specialize in reversing valve, defrost board, and refrigerant diagnostics across all major heat pump brands.