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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Not 56, but Sb, stuck button, check the back of the control panel for corrosion. We had the same issue and found some moisture had caused a spot of corrosion blocking the contacts. Cleaned it out and worked like a charm.

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Thanks for choosing FixYa.

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H-series Electronic Gas Pool Heater H400: I have an H400 with digital temp control panel, th...


It is likely the keypad that has gone bad. Not difficult to replace. But you want to be sure thats what it is, as it is an electronic part, that is usually not returnable. The part number would depend on the model of the heater. Likely it is a h400idxl2 heater.

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You most likely need a new touch pad and they are almost impossible to troubleshoot. If everything else works except "button A" then button A is bad and in this case that means the whole thing is bad. Sorry...

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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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