A. UNIT IS RUNNING, BUT NOT HEATING
• Is water flow through the unit adequate? Check
the unit for obstructions, such as a clogged filter
pump strainer, a dirty filter, or valves not positioned
correctly.
• Is the ejected air from the unit 8°–10°F cooler than
incoming air? If so, the unit is extracting heat from
the air and transferring it to the pool.
• Is water condensing on the evaporator and internal
copper pipes? This is also evidence of heat
removal from the air. When the air is cool with low
humidity, condensation may not be evident.
• How long has the unit been operating? During initial
pool heating in cold weather, it may require a
week to elevate the water temperature to a comfortable
level. Normally, it takes about 4 days.
How many hours per day is the unit operating?
Remember that the heat pump pool heater only
operates while the pool pump is running. Set the
time clock to permit 24 hour per day operation. After
the desired temperature is reached, return the unit to
normal operation of 8–10 hours per day.