Heat Pump Running but Not Heating

• Is the air blowing out of the top of the unit noticeably cooler than the surrounding air? (a 9°F to 12°F difference is typical)
  • If not, call AquaCal for service at 800-786-7751
• Be sure all air coil surfaces are free from obstructions; low roof overhangs, landscaping, walls, fences, etc. The heat pump needs good airflow to operate at peak efficiency.
• How long are you running your circulation pump each day? Cooler weather conditions, or heating to a higher temperature, may necessitate running the heat pump for a longer period of time. A pool blanket can be useful in permitting shorter run times, in turn leading to substantial energy cost savings.
• What is the air temperature? Your heat pump may be in the defrost mode if air temperatures are below 50°F. The digital display will read “FS” if the unit is defrosting or air temperatures are too cold.

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