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Swimming Pool Heater Not  Working? Here Is How To Check:

Swimming Pool Heater Not Working? Here is how to check:

All heating systems, after a few years of operation, can have their share of problems. Because we have been in the heat pump business for so long, we have had the opportunity to help a lot of our customers when they notice their unit is not working properly. Here are some basic steps to check and see if its operating properly before calling a heat pump professional.

    1. Air temperature. As we all know, air-source heat pumps transfer heat from the air to your swimming pool. Therefore, they depend on the air temperature. A heat pump operates more efficiently in warmer air because more heat is present in higher temperatures. Similarly, a heat pump operates less efficiently in cooler air and will need to run for a longer period of time in order to heat your swimming pool.
    2. Temperature difference. What is the temperature difference between the air entering your heat pump and the air exiting your heat pump? It should measure between 9° and 12°F (5° and 7°C). If it does, then your heat pump is operating normally, and your heating failure is most likely due to inadequate run time of the heat pump. Remember, your heat pump’s run time depends on your filtration pump’s operation.
    3. Evaporator coil obstructions. Without sufficient air inflow and outflow, your heat pump will heat less efficiently. An inefficient heat pump will not only heat your swimming pool more slowly, but will also increase your electric bill. Remove all leaves, pine needles, twigs, and other objects from the top and sides of your heat pump.
    4. Flow, Flow, Flow! Constant, sufficient water flow is needed by your heat pump to transfer heat from the refrigerant to your swimming pool. Insufficient water flow will not only lengthen your heating time, but will also cause damage to your heat pump’s internal components. To check your water flow, make sure the valves to your heat pump are completely open and that your filter is clean.

If you’ve already checked all of these items, then you probably need to call for service. AquaCal® is here to help!

This Post Has 17 Comments
  1. if the setting is on pool, heat but the heating indicator light is red when the other lights are green, does this mean that the heat isn't working?

    1. Hello Karen-

      Thank you for your question. When the compressor activated, the heading light will show red, red as in hot or heat… heating…. get it? When the compressor is off the light will also be off, in other words, The heating light only comes on red when it's actually heating otherwise the light goes off.

      Please feel free to contact us should you have any further questions.

  2. the heat pump is showing the actual pool temperature at 85 but the pool thermometer shows 92. is there a way to calibrate the thermometer on the pump?

  3. I just purchased a brand new heat pump yesterday , it turned on once but after I shut pool pump off
    to clean filter & started it again it will not turn on . I am not getting any error codes , it is displaying water temp ( 70 degrees ) & I have it set at 87 degrees . This is a new client & i need this resolved immediately

  4. The heat pump tries to start when the pool pump is not on. It makes a loud bumping sound when it tries to start. It does this every 3 or 4 minutes until I set it on OFF. This problem just started. Any suggestions? Thanks.

    1. Hi Karol,

      Our heat pumps recognize water flow with a water pressure switch. When your circulation pump is turned off you should see “FLO” on the display. The heat pump can continue to run after the circulation pump is off when the heat pump is positioned lower than the pool water surface. This difference in height between the heat pump and pool surface can cause enough hydro-static pressure to activate the pressure switch and the heat pump will try to run. There could also be an issue with the pressure switch. Please call us at 727-823-5642 if you have any questions.

  5. Looking at replacing a dead aquacomfort pool heatpump with an Aquacal. My question is what would I do for service here in southern NJ(zip 08234)? There are no service firms listed within 100 miles. Would an Air conditioning firm be able to repair and order parts from you? Any other idea?
    Thxs
    Bob

  6. The outside temp is 86. The water temp reads 82. The pool light and water temp lights are green. The touch screen is frozen. Nothing happens when you index any button. Please advise.

  7. hi my heater starts perfect then as usual the red indicator of heating turns on red and sound a click in the unit but no hot water its getting out of the heater what could be happening

    1. Good Afternoon Marcos,
      Hope you are doing well. This will most likely be an issue with an internal component not starting your compressor.
      It is best to contact at our factory to have us check for a local service agent.
      Please call Customer Support at 727-823-5642
      Thanks,
      Robert Brown
      AquaCal/AutoPilot Tech Support

  8. The unit starts up, but the red heating light doesn’t come on and after a few minutes the Code PH5 appears. I have cleaned the filter, checked the valves. Had this problem a couple of years ago and cleaning the filter did the trick but not this time. Any thoughts. Don

    1. Good Afternoon Don,
      Hope you are doing well. In most cases the HP5 message is water flow related.
      However, in other cases this is a problem with the flow of refrigerant instead. If there is a refrigerant blockage, the compressor may run for 5-10 seconds & then shut the machine down on HP eventually going to HP5 after 5 attempts to run within 1 hour. I would contact us at 727-823-5642 to request a service a call.
      Thanks,
      Robert Brown
      AquaCal Tech Support

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