Question about Hayward 116k HeatPro Heat Pump HP3100

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Hayward pool heater - p5 code

My hayward heatpro pool heater is displaying a P5 code. what does this mean?

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The code is "PS" for Pressure Switch and means there is insufficient pressure to operate (low flow) or the switch itself is bad.

Posted on Apr 22, 2010

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It means there is none or insufficient pressure to operate. If your pump is on, try cleaning the filter. That worked for me.

Posted on Dec 28, 2012

  • luis_cabrera Dec 28, 2012

    It means there is none or insufficient pressure to operate. If your pump is on, try cleaning the filter. That worked for me.

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1 Answer

How much pressure my hayward heater need to work fine?


same as while vacuuming the pool..low speed circulation.

Oct 16, 2013 | Hayward 116k HeatPro Heat Pump HP3100

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What does p5 on display mean


Thank you for posting your question here on Fixya.com.


I believe your code is PS, not P5, and it means the pressure switch is open.


That unit will not fire until you resolve the pressure switch issue; either the flow is reduced too low and the pump/filter system needs to be thoroughly cleaned or the switch or control board has failed and need to be repaired.


Start with a cleaning of all baskets and filter to see if the light clears and the heater works; if not look at replacing the pressure switch. It is not uncommon for the switches to fail but check it with a meter set to ohms if you can. Power off the heater first and pull one of the wire leads off. Put the probes on the terminals with the pump running and see if you have a circuit. If not, replace it. If the switch tests fine the problem is in the control board and it will need to be replaced.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


John

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I have a hayward heatpro model hp2100. the heater will run and heat the pool for a while then shuts down displaying LP on the digital screen, after a period of time it will clear the LP and have running...


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).

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OP is the error code for a faulty Temperature Sensor. Try replacing the Temperature Sensor. I have seen many of these units have the wires chewed up by mice, etc., so you may want to check the wiring for any damage.

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You heat pump is actually displaying "PS" for Pressure Switch. Either there is not enough water flow or the switch could be bad. If you have a sand filter, put the filter head in the "bypass" mode and try again. If the heater works, filter problem. If not, heater problem. Instruction book found here: http://www.haywardnet.com/products/Manuals/pdfs/Manual122.pdf

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Follow the troubleshooting guide on page 36 of this owners manual. It will walk you through problem solving... http://www.haywardnet.com/products/Manuals/pdfs/Manual285.pdf

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LP (low pressure fault) is on screen.


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.

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