Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater

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My pilot light is on, but the heater does not

I just opened my pool on Saturday. I forgot to connect the tube in the heater until today (Monday) so I had a leak, which was running inside the heater. I have been able to light my pilot light and so far, it is on, but the heater does not engage. I just finished backwashing the filter so I think it should have proper pressure.

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Problem with the thermocoupler its not producing a minivolt of 250 plus that is needed to open the main gas valve


Posted on Jun 05, 2010

  • puroc Feb 14, 2011

    It's the the Power Switch. I bypassed it and now it works fine. Do not bypass the flow swtich because that is very important unlike the power one.



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1 Answer

Why will my hayward h 250 millivolt pool heater pilot light not stay lit

Looks like your pilot generator may have some corrosion on it. Follow the stainless steel tubing on the gas valve as it goes down to the burner area. At the end of this is the pilot assembly. If you can remove this so your able to work on it you will se a short metal rod that the pilot flame touches when lit. This generates current that keeps the gas flowing to the pilot to keep it lit. Take some sand paper and give it a light sand to remove any corrosion on it. Reassemble at put it together. You may also need to clean the pilot tube(stainless tube from valve). Small spiderwebs can reduce the flow to the pilot and cause this problem also

Jun 25, 2014 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

How do you change the flame sensor

It is not a flame sensor. It is a pilot generator or sometimes it is called a thermal pile or thermocouple.
easy to replace...
loosen brass nut, with aluminum tube at gas valve, and take good notice here... Two wires follow along the tubing and are connected to two of three screws on top of gas valve - loosen and remove. then unsecure pilot assembly from under the burner tray. Pull out the pilot assembly as one unit along with the tubing.
Then either unscrew small retaining nut or just pull straight down and generator will slide out.

i would replace the whole pilot assembly. If not at least clean the pilot orifice!

look at the picture at the following site. Click on 'enlarge picture'

good luck.

Parts4heating com Teledyne Laars R0027600 Pool Heater Universal Pilot...

Jun 15, 2014 | Hayward H-series Electronic Gas Pool...

1 Answer

Pilot light wont light will spark, but no propane

verify the inlet pressure to the heater. those pezioelectric spark lighters are garbage. make sure all manual shut off valves to the heater are open. Pilot tubing may also be blocked

Nov 25, 2013 | Glo-warm 503284 30000 BTU Propane Gas Vent...

1 Answer

Heater ignites with a whoosh and blows out the pilot light

Thank you for posting your question here on

Clear out the spiders or other debris that is blocking one or several gas jets into the burner tubes. After the heater lights the first time, use a mirror to see which burners are not producing a flame to know which jets to clean. At least the one closest to the pilot assembly will be blocked.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


May 31, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Pilot wont light //suspect corrosion, connections..

If your pilot assembly is corroded, you will have trouble lighting the pilot.
I would highly recommend replacing the pilot assembly. By doing this, you will have a new pilot generator that will be producing a larger amount of voltage to run the gas valve. Also, you will have a clean pilot tube and orifice so gas can run unobstructed.

Oct 21, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

Heater turns on and off

not rectifid the flame let me guss jandy LJ need new parts the ignator kit and the rectification kit if LJ

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1 Answer

H250 heater spark, but no pilot

Spider nest in the pilot assembly. You should be able to pull the pilot out, remove the pilot tube and orifice inside, and see and clean out the silk.If not, a new assembly is about $100 from a pool store. We sell them at

Jun 13, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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