Troubleshooting; Heat Pump Not Running; Heat Pump Running But Not Heating - Aquacal Aerotemp AT100 Owner's Manual

o Is the display lit? If not, ensure the main breaker (located at the power supply
panel) and the disconnect switch (located near the heat pump) are both turned ON.
o Does the display read "Flo"? If so , check to be sure that the circulating pump is
operating and the filter is clean. There may also be a valve positioned incorrectly
allowing water to by-pass the heat pump; be sure water is flowing through the
heater.
o Does the display read "OFF"? If so the desired water temperature is set below
60°F. Raise the desired water temperature above the actual water temperature and
the unit should start after a 3-to-4 minute delay.
If the display is showing any other fault codes, or is blank, contact AquaCal at
800-786-7751. Service may be required.

HEAT PUMP RUNNING BUT NOT HEATING

o 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.
o 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.
o How long are you running your circulating 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.
o 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.

TROUBLESHOOTING

HEAT PUMP NOT RUNNING

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