Question about Hayward 250kbtu Ng Pool Heater - Inground

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Lighting pilot on H250

This is my first time opening my pool. To light the pilot I hold down the pilot control valve but, can't find an ignitor switch? Where is this switch?

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Small red button in the bottom left corner of the heater. Looks like the ignitor on some grills. Push it hard enough and it will 'snap' which sends the spark out at the pilot head.

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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I am a new homeowner. I have an H400IDLunit that is a pool/spa combo. The code reads "00" in the heater window and does not change when the unit controlls are pressed. I have an aqualink...


I don't know if there is a pilot light, spark ignitor or thermal ignitor. I would determine by inspection what kind it has. If you open the front cover you will find a gas valve. It can be identified by following the gas pipe that enters the side of the heater and attaches to the gas valve. If the valve has a control knob on it that has an off, on and pilot position then it is a pilot type. If this control is not on the valve then the unit includes an automatic ignitor.

To light a pilot equipped system place the knob in the pilot position, push it down, and use a flame to light the pilot. If you hear gas flowing from the pilot but it won't light then there is air in the line and it needs to be purged. Holding the pilot lighting valve down long enough will purge it but may take a long time. Periodically you can check it by trying to light it. If it lights watch it for a while before trying to turn the heater on to make sure it is fully purged. Once the pilot is stable and the thermocouple is heated the pilot valve can be released and it should stay lit. If not, try again.

Don't get down and look into the burners while you are trying to start the system because it could flame out and burn your face. If you turn on the heater again then the gas valve should come on and the burner should light. You can usually hear a loud snap when the gas valve come on. You should then hear the gas flow to the burner. If the burner doesn't light you should be able to smell the gas. If it lights exhaust will be coming out of the vents in the top of the heater.

I am sure you will have more questions so please respond with them. I hope this helps.

Sep 04, 2011 | Hayward H-series Electronic Gas Pool...

1 Answer

Spring start up of pool. cannot get pilot to light for furnace.


Maybe, but unlikely. The amount of gas that is released to the pilot is pretty small. I assume the heater is outside, where the slightest breeze would blow the gas away. I also assume you are having trouble lighting the pilot and you are wondering if maybe there is no gas, since you can't smell it? It may take a few minutes of holding the button down before the pilot will light, and once it does, you may not be able to see the flame in the light of day. If you wait until dark (or at least dusk) you should be able to see the flame of the pilot more easily. And don't forget to hold the button down for a minute or two after it lights to be sure the thermocouple has had time to heat up. If you release the button and the pilot goes out, you probably didn't wait long enough, but it will re-light easily. I hope you find this helpful. Good luck.

Jun 09, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

I have an H250 NG and when I light the pilot it goes out when I release the pilot button on the gas valve?


The first thing That comes to mind is a bad pilot generator or thermopile. This makes a small half volt charge that energizes the magnets that open the two stages in the gas valve. Next would be a bad gas valve itself. You will need a milivolt meter to check both of these. Lastley is the safty circut. This is the string of switches that can shut the heater down if problems exist. Their are two sets of wires connected to the gas valve. One set goes down to the pilot, this is for the pilot generator. The other set is the safty circut. If you remove these wires and the pilot lightes and stays lit the problem is in the circut. Still no pilot then it is in the pilot or valve. Good luck.

May 28, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

The heat wont turn on and pilot does not stay lit


If this is a M/V heater you must have at least 400mv/dc to hold the pilot valve open. Check to make sure that the pilot is lighting, then hold the pilot valve down for about a minute. If the the pilot goes out you need to see what the m/v reading is. Chances are you have a bad pilot or gen. Replace.

Mar 06, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

How do I light my Rheem water heater if my peizo ignitor switch isn't working


Remove the burner access cover under the control valve. Press the pilot light button (gas control) and hold it down. At the same time, light the pilot. Continue to hold the lighting button for a few seconds until the thermocouple heats up. Release the button. Twist the gas control knob to the ON position, and the burner should fire up after a few seconds. Replace the access cover. Good luck.

Feb 09, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Cannot tell where pilot, on or off is on gas valve


I assume you have a W-R and should see a small notch down around 5 o'clock or so. That position is where you depress the knob to light the pilot.

Jul 03, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

Pilot will not stay lit after button release


most likely you have a thermopile that has low output. it takes about 100mv to maintain pilot light

Jun 24, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Pilot light is lit, but heater will not fire


Make sure thermostat is set higher than water temperature. Make sure pump is running and water is flowing through unit. If gas valve is not opening then flame sensor or gas valve is bad.

Jun 02, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Hayward H250 (millivolt) pilot won't stay lit


make sure the flame hits the thermo couple if so then replace it lows has them in the water heater section thermo couple gets hot makes millivolt signal then opens gas valve

May 08, 2009 | Hayward H Series Millivolt 250,000 Btu...

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