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My Aquacal heater stopped and says HP5 on control display

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Heat Pump comes on, fans slow down, switches off?


Sounds like a bad temp sensor or switch. Like in cars my guess is that the switch is failing to work causing the fans to stop despite the pump getting hot.

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contact your pool service provider if you have one or find out where the installer got that heater from they will carry parts or a new heater..

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What does HP5 mean on my heat pump?


please refer to page 51 of this manual. http://aquacal.com/heat-pump-information/support/manuals/pdf/man-AT_HW_SQ.pdf

This explains that it is either due to your pump not pushing enough water.
Or the pressure switch is clogged or failed.
Or the wiring has shorted.

Check to make sure the circulation pump is not clogged and flowing freely.
make sure the filter is clean and flowing freely.

if this does not fix the problem, replace the pressure switch.
refer to page 56 for pressure switch identification.

Nov 18, 2010 | Aquacal HEAT PUMP 120,000 BTU H135 -

1 Answer

AquaCal Model 120 AHDEBNC message on panel wont clear. Message is FLO. There is water flowing thru the heater and the filter is clean


If you have a by-pass, (This will be a pipe that runns in between the in and out pipes on the heater) The valve must be almost closed in order to get enough volume through the heater to get it to run.
Make sure that heater has enough time to respond to this adjustment. It will take up to five minutes to start.

Oct 27, 2010 | Aquacal HeatWave

1 Answer

HEAT PUMP SAYS WATER TEMP IS 99 DEGREES WHEN ITS 82 CAUSEING PUMP NOT TO TURN ON WHATS THE REMEDY NOT SURE ON BTUS MODEL NUMBER IS 120AHDEBNC AQUACAL kind of in a bind thanks


This is a bad temp sensor or an open by-pass. You would have to go to your book to find these though. I'm not sure where you would find them.

Oct 13, 2010 | Aquacal HEAT PUMP 120,000 BTU H135 -

1 Answer

I have a AquaCal Heatwave H125C-A Pool Heater. The Heater is working in that the power is going on and the air is blowing- although- the air is usually colder than the outside air and now it is only air...


Sounds like your compressor is not running. After your fan goes on in one to five minutes you should hear the compressor kick in. If it does this and then kicks out again it can be something as simple as water flow and you can adjust the valves to get more or less flow to keep it running. If not you probally need a repairman. It is ether your compressor or the capicators that start the compressor and this is all high voltage. Good luck.

Jan 25, 2010 | Aquacal HEAT PUMP 120,000 BTU H135 -

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