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What is the easiest way to change the pilot generator on a LP400 heater? Do I have to remove the complete burner assembly?

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Easiest way is to remove burner,but it can be done without.use a long 5/16 nut diver to remove the 2 nuts that hold pilot to bracket.then remove pilot line from gas valve (7/16) and slide out.hardest part of this method is getting pilot assembly back on bracket

Posted on Jun 20, 2009


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Why would the flame and pilot keep going out changed the thermocoupler

Remove the cover over the burners so an inspection of the heat exchanger is a bit easier. Take an LED flashlight and a small telescoping mirror and inspect the heat exchangers front section above the burners giving special attention to the two sections of the chamber on either side of the pilot light. Many times there will be a hole in the chamber or a crack that will allow the blower that circulates the air into the duct blow out the pilot light.

If you are handy enough, consider turning off the gas and remove the ribbon burners prior to performing your inspection. The pilot assembly is probably attached to one of the burners. Lay them on the floor in the order in which they install in the furnace as some furnaces have dedicated left and right end burners and most older standing pilot furnaces have the one burner with the pilot mounting bracket.

To remove, many times you gently pull backwards towards the gas manifold while raising up on the front of the burners. Once elevated enough, the burner then slips off the brass spud (orifice) and forward and out.

The next reason the pilot can go out is because the safety 'holding' coil in the gas valve is defective. Its responsibility is to hold open electrically a safety circuit proving the pilot gas is burning so that main gas can flow. The thermocouple generates just enough electricity to hold the safety coil open. Coil bad = pilot out.

If your furnace is over 25 years old, there is a good chance there is a hole or crack.

Feb 19, 2015 | Dayton Gas Furnace Heater

1 Answer

How do I clean or replace the pilot generator on a Jandy Lite 2 pool heater? The pilot will stay lit but the main burners will not come on. Jumpering the gas valve will ignite the main burners and the

if the pilot stays lit and main burners wont fire you don't need to replace the pilot generator! you have an open safety, poor electrical connection or a problem within the tstat controls

Aug 19, 2014 | Pool & Spa

1 Answer

How remove a pilot generator from a minimax ch 200m

shut off gas supply. undo gas line union. remove wiring from gas valve. undo burner tray support screws. slide burner tray out. remove pilot generator leads from gas valve. pull out pilot generator from pilot assembly. then re assemble

Aug 17, 2014 | Pool & Spa

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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

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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

Where can I find helpful instructions for replacing (removing old and installing new) thermocouple on Pentair 250k minimax ch NG mv? Thank you.

  • Insecure bracket holding the pilot assembly to the burner tray
  • now, remove the pilot assembly from bracketry
  • unscrew old pilot generator/thermo pile or thermocouple
  • new may have a clip instead of threaded nut
    • diameter of hole is same so it should just snap into place
  • in reverse order resecure the pilot bracket to burner tray



May 30, 2014 | Pentair 250k Minimax Ch Ng Mv Heater

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The Hayward H Series Pool Heater with standing pilot uses a standing flame to safety initiate combustion, and the standing pilot flame is uses to generate about 0.400 to 0.450 volts DC to operate the gas valve.

CAUTION: Your Hayward H Series Pool Heater is essentially a furnace. Only qualified technicians with proper training and tools should repair your heater.

Once you have completed the pilot start procedure in your heater manual, the pilot flame should be visible but it is difficult to see. The pilot is located at the bottom of the heater, to the left side of the burner chamber, about half way between the front and back of the heater. Before attempting to verify the pilot, it's wise to turn the thermostat to the full counterclockwise OFF position. There are two useful methods to verify the pilot: 1) Before you initiate the pilot procedure, place a small mirror on the floor of the heater on the left side of the burner chamber, just inside the combustion area. CAUTION: DO NOT attempt to place or remove this mirror while the heater is in combustion mode! After placing the mirror, you should be able to see the pilot assembly. Follow your pilot start procedure, then you should be able to see the pilot flame in the mirror before you turn the gas valve knob into the ON mode. Be careful to remove the mirror before initiating combustion. 2) Only when the pilot flame is on will the thermocouple generate the circuit voltage required to operate the gas valve. During the pilot start procedure, while the gas valve knob is still in the "pilot" position and the pilot flame is on, the circuit voltage can be measured at the gas valve without danger of initiating combustion. Using a volt meter, measure the voltage between the RED and WHT wires on the gas valve terminals. This measurement should be between 0.400 and 0.450 volts DC. If below, the gas valve will not operate even if the pilot is ON.

After verifying the pilot, be sure to remove the mirror (if used) and the voltmeter (if used), turn the gas valve to "ON", and return the front heater cover before initiating combustion.

May 24, 2014 | Hayward 250kbtu Ng Pool Heater - Inground

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The pilot light won't stay on. Also, the heater will just shut off five minutes after turning it on. I would have to light the pilot again and then it would stay on. But know the pilot won't even stay...

There are a couple of things that may be causing your problem. First, the unit may just need a thorough cleaning. You van do this by completely removing the heater cover on each side of the heater. Do this with the pilot off and the heater is cool.

Using a vacuum cleaner (a shop vac works well) that has a hose and brush and crevice tool attachment. Gently vacuum all of the interior of the heater, including the burners and around the pilot assembly. In addition, using a can of compressed air with a straw nozzle (like you clean your computer with), blow out the pilot and the burner ports. After cleaning the Pilot Assembly, check the Thermopile (also called a Thermogenerator or Pilot Generator), it's the solid bi-metal rod like piece that's in front of the pilot light. Track the wire(s) from it back to the Gas Control Valve and make sure the connections are secure. Depending on on the age of the heater, it may need replacing. ( While the heater cabinet is open, using a flash light look up into the vent stack for any obstructions that may be present. If you see any, clean them out. Before reassembling the heater cabinet, go outsie and look at the exhaust stack on the roof. Pay particular attention to the termination cap. Due you see any obstructions there? If so clean them out.

After completing all of the above, reassemble the heater cabinet, light the pilot and take the heater for a test run. If it repeats what it was doing prior to your cleaning and servicing, you'll need to replace the Pilot Generator.

To help you even more, I have included a link to your Owners Manual, just in case you have misplaced yours.

Hope all of this helps solve your problem.


Feb 14, 2011 | Williams Heating & Cooling

1 Answer

Im looking for the pilot light

The pilot light is normally located over the just burner box and will have a small door or removable panel to help get to it. The easiest way to find it it to first locate the gas valve. This will be an aluminum block with a few pipes connected to it. It will also have a knob with Off, On, and Pilot written on it. Once you have found the gas valve, look for two small diameter pipes about 1/4" and 1/8" in diameter. Follow these pipes inside the burner area. It will lead to the pilot assembly. Follow the directions on the heater to start your pilot.

Oct 12, 2009 | Cozy Enclosed Front Console Heater 70,000...

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Main burner will not light. pilot has now gone out

shut off the gas at the gas **** and gas valve. the pilot tube is held in place by a 7/16 compression nut. remove it then remove the 2 screws for the thermopile "generator". follow the pilot tube and the pilot assembly should be held in by one or two screws. usually you don't have to remove the main burners. hopefully this helps

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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