Question about Hayward H Series Pool & Spa Heater Electronic Dual Ignition 250,000 Btu Natural Gas H250ed2

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Stays on for approx. 3-5 seconds then shuts off. Can I bypass the pressure switch to see if that is the problem. If not what next?

Hayward H250ed heater will not stay on. It ignites and runs for anywhere from 3seconds to 10 minutes then shuts off. I suspect it may be the pressure switch assembly. Please help

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Posted on Jan 02, 2017

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SOURCE: Hayward Spa Heater ignites for 2 seconds and shuts off.

Sounds like this is a flame sensor issue. It is not detecting the flame.

Posted on Apr 04, 2009

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SOURCE: hayward heater not staying lit

possibly poor pilot adjustment or insuficient mv output from thermopile

Posted on Jun 19, 2009

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1 Answer

How do I adjust the pressure switch on my hayward h250 heater


The purpose of the pressure switch is to verify the pool pump is operating properly and water pressure is present in the heating chamber. When water pressure is not present, the heater control system is designed to not allow initiation of flame. The pressure switch is preset at the factory for deck level installations. When the heater is located below the level of the spa or pool, the pressure switch may require an adjustment to compensate for the no-flow static head.

CAUTION: The Hayward Pool Heater is essentially a furnace. A trained technician should be consulted to repair it. DO NOT OPERATE the Hayward Pool Heater without a properly functioning and calibrated water pressure switch. The pressure switch adjustment requires both the pool pump and the heater be operational. As a result, extreme caution should be used during this procedure since sources of energy can not be isolated during the procedure.

The following procedure is recommended to calibrate the pressure switch.

1. The water pressure switch is located behind the front service panel. The pressure switch is typically on the left side, above the burners.
2. Be sure the water filter is clean before making the adjustment.
3. With the pump and heater system switch on, carefully turn the pressure switch adjustment dial clockwise, until a click is heard from the gas valve.
4. Turn the adjustment dial counterclockwise 1/4 turn.
5. Turn the pump off and on several times. The heater should shut off immediately when the pump is shut off. If the heater fails to shut down when the pump is off, repeat the steps above until the pressure switch is properly adjusted.
6. If the adjustment process fails to produce proper results the pressure switch should be replaced.

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it sounds like a flame sensor.its located in lower end of burner box,remove it and clean with fine steel wool or emory cloth.

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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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Try cleaning your filter if dirty there will not be enough flow to llet heater fire. If filters clean you can try jumping the pressure switch.

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possibly poor pilot adjustment or insuficient mv output from thermopile

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2 Answers

My heater starts and then after about 3 seconds shuts off


Either , you really don't have good pressure (below 18 PSI on filter) or your water pressure swith is defect.
Try placing your filter on "recir" and fire the heater , if it fires and stays on .....it's definitely your pressure -back wash.
hope it helps

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It sounds like the pump is either overheating or the thermal protection switch that senses the overheating situation is defective. If nothing else changed like running on an extension cord, etc, a small motor repair shop can get you back up and running fairly inexpensively.

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1 Answer

Hayward Spa Heater ignites for 2 seconds and shuts off.


Sounds like this is a flame sensor issue. It is not detecting the flame.

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