Question about Hayward H-series Electronic Gas Pool Heater H400

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Hayward h-series contol panel arrows dont work. cant adjust temp

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Ensure your getting 24volts to display circ board. you will probably need to replace the display screen

Posted on May 09, 2014

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Posted on Jan 02, 2017

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1 Answer

Cant change pool heater temperature


see if set on remote if not bad display board or hold up and down at same time for 7 seconds maybe locked

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I have a haywood h series h 400 pool heater. Each night the the pool pump timer runs b/t 12-7am.. The heater was working fine. and pool temp is around 70-80.. However, lately the heater which is on when...


Allheaters run off of a thermostat just like the heat to your house. It will shut off once heated to the selected temperature. Turn up the temperature, and monitor it for a couple days.

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Look at your remote carefully. There is a bal pen type push to reset filter button on the remote. Depress the rest button and it should reset. Also on the contol panel you can also reset it by depressing the mode and the UP temp arrow buttons for 5 seconds.


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Kelly

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There is a thermistor temperature sensor beside the inlet union on the heater that goes bad, it looks line a stainless steel nut with wires on it. You can unthread to replace it and it plugs into the board behind the display. The LO means low pressure probably caused by pressure switch adjustment.

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MY HYWOOD h SERIES POOL HEATER DOES NOT LIGHT. IT


are you sure the code isnt FO , which would indicate flame sensor failure.usually can be solved by removing and cleaning fl sensor with fine emory cloth.since htr is calling for heat ,pressure switch does not need adjusting

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possibly poor pilot adjustment or insuficient mv output from thermopile

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