Try cleaning the filter.
SOURCE: My hayward pool heater is displaying P5 and the
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
SOURCE: Hayward pool heater - p5 code
The code is "PS" for Pressure Switch and means there is insufficient pressure to operate (low flow) or the switch itself is bad.
SOURCE: Hayward pool heater wont stay lit
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
SOURCE: OP error code. What is wrong with my Hayward pool
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.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
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