Question about Hayward 116k HeatPro Heat Pump HP3100

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I have an error message of lp on my mark 6 eus heat pump..iv tried turning off breaker and increasing the pool pumps water pressure...still won't work

Posted by ken regs on


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  • 78 Answers

SOURCE: panel reads lp error code

Loss of refrigerant, bad motor for the fan clean the coils and unit as described in the manual. Here is a manual from the Hayward website or here

Posted on Jun 06, 2010


adam hudson

  • 310 Answers

SOURCE: we have aheat pump and

The LP is for low pressure of the refridgerant. Your pump coils are either frozen, or the switch pressure switch is bad, or you are just low on refridgerant.

Posted on Jan 07, 2011


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1 Answer

Aqua pro 500 is flashing lp. We just had a new pump installed and are just trying to get pool warmed up. Pump worked fine last season. Any suggestions?thank you

LP: This code means "Low Pressure" or low pressure switch. Either the outside ambient temperature is below 50°F (38°F
for h/c units), which is too low for the heater to operate, or the unit is low on refrigerant. Once the outside temperature has risen above 60?F, and the LP code remains, call the factory for repair.

Apr 21, 2018 | Aqua Pool & Spa

1 Answer

What does the LP code mean?

low pressure ,MEAN low water pressure going to the unit or low pressure refrigerant is heat pump correct ?

Jun 09, 2013 | Hayward Pool Products Hayward Heat Pro -...

1 Answer

Hayward heat pump error code L P . what does this mean?

LP is an error message refering to the low pressure switch. For more information about it please refer to

Aug 11, 2011 | Heating & Cooling

1 Answer

What does LP stand for , Ive seen when it says PS(power save) but Trying to heat the pool and ran for a day then said LP?

LP is an error message refering to the low pressure switch. For more information about it please refer to your owner's manual here. If you decide to persue attempting to repair it yourself and need further assistance, please reply to this post with a new comment or start a new post with your specific question(s).


Feb 01, 2011 | Hayward 116k HeatPro Heat Pump HP3100

1 Answer

My heat pump is displaying LP, what does this mean?

Low water pressure through the unit, you just need to adjust your valves to supply the right pressure to the heat pump.

Dec 29, 2009 | Hayward 116k BTU HeatPro Digital Heat Pump...

1 Answer

LP flashes when it is turned on


May 22, 2009 | Pool & Spa

1 Answer

I have a rome Industries Pool heat pump model 105 showing error code LP???? what does that code mean and what do I do?

I happen to work for Rome Industries and can help you out. The "LP" code on your control board represents "Low Pressure". This is referring to the refrigerant pressure within the unit. The unit is equipped with a low pressure safety switch that when activated shuts the unit down. This could be caused by a refrigeration leak, a stuck thermal expansion valve, or even a faulty pressure switch. If you live within the state of Florida contact Rome Industries and you will receive a free of charge service call including parts and labor as long as your unit is under warranty. If your outside of the state please contact your dealer to handle the claim. Have a good day.

May 01, 2009 | Pool & Spa

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