Question about Water Warehouse Hayward HeatPro In-ground Heat Pump

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LP (low pressure fault) is on screen.

I have a Hayward HeatPro feat pump for my pool.
The LCD screen shows LP. What does this mean and what can I do?

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  • Anonymous May 23, 2009

    Did you find a solution for this? I have a hayward 21002 heapt pro with LP and it won't turn on - has power to it though. I called for service and they said $200 to come out and see and it is either the freon? or the switch?

  • mgribb May 23, 2009

    I have the same issue. A Hayward 212002 Heat Pro and it won't run. Only two years old. Is displaying an LP error on the screen - for low pressure? It is electric and is gettnig power.

    I called for service and they are charging about 180 just to come out and said it could be freon or a switch.

    Did you solve your issue? Or does anyone else have any ideas?


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Low pressure is usually a dirty filter ob basket. If you have a by-pass on the plumbing you can shut this down a little to get more flow through the heater. Or you may have a clog in your pump impeller. Hope this helps.

Posted on Oct 05, 2009

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LP (low pressure fault) is on screen.

This could be something as simple as a dirty filter. Heat pumps are notoris for pressure problems as they are very fickel. Make sure your filters are clean, then their should be a by-pass assembly on your inlet, outlet pipes for water this valve needs to be set at just the right spot to keep the water flow high enough to collect heat but not so high as to not warm enough. Setting this flow is easy enough with the unit on restrict the flow till the unit starts and wait to see that it keeps running. use a gentel hand and do this very slowley as the unit takes time to respond. But first make sure your filters are very clean and your baskets also. These are usually the culpret's when it comes to low pressure and low flow. The switch usually just tell's you that is where the problem is. If their is no corrosition or leaking at the pre. sw. more often than not it's ok and just tell's you to start looking for the problem. Good luck.

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