Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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Pilot light will not stay lit, have full tank of propane gas

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Clean or replace the flame sensor

this link is for the parts diagram
http://www.haywardnet.com/inground/products/replacement_parts.cfm
if this helps please vote


Posted on Nov 12, 2009

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1 Answer

Pilot light lights but will not stay lit with full Propane tank.


Unscrew the thermocouple at the gas valve. Lightly sand the connections,seat and thermocouple end. Sometimes the tiny current generated that keeps a gas valve open will be diminished by corrosion. don-ohio

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Check your propane tanks (are they full?), make sure the valve is on, then check to make sure gas is making its way to the hot water tank, if the pilot lights but won't stay lit your flame sensor is faulty.

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My fathers Bosch water wizard tf 250 will not start. the water will flow but no gas will not ignite or come through the pipe to the heater. the gas bottle is full. thanks Dave Tooley


Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.

If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.

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Jun 22, 2011 | Heating & Cooling

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The heater is attached to the propane tank properly; however, when I try to light the heater, the push valve does not allow the gas to pass to the heater to be lit. I do have all of the valves open on the...


Typically there is a safety device directly above the pilot light that must be up to temp for the gas to flow. You did not specify if the pilot is lit. If not, hold the lighter at the pilot light while depressing the button for one minute. This allows the sensor to warm to operating temp, thus allowing gas flow. Once pilot is lit adjust the temperature accordingly.

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I have a Martin ventless gas log fireplace. I


Sometimes when you turn a gas heater off for some time, if the source tank has been turned off, the line will bleed the propane and the line will contain mostly air. This is especially true if the supply line is long. In order to light the pilot, you will have to hold the pilot lighting button down for a while (a full minute or longer, depending on the size and length of the supply line) before pure propane arrives at the pilot light jet. You should keep a lighted lighter at the jet so that when the gas arrives, the lighter will light it. After the pilot lights, you will have to keep the button pressed long enough for the thermocouple to get hot enough to set the pilot to stay on. When it is hot enough, you should be able to release the pressed lighting button and the pilot should stay on. If it does, you should be able to light the heater. If the pilot jet never lights, gas is not getting to the regulator. If the pilot will not stay lit after a period of time waiting for it to heat the thermocouple, the thermocouple or the regulator may be bad and need replacement. :-)

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YOU WILL HAVE TO TAKE THE TUBE FROM THE CONTROLLER TO THE PILOT TIP APART AND CLEAN OUT THE ORFICE AS THE SPIDERS MAKE NESTS IN THEM.

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Laars Lite 2 LG - pilot light will not stay lit. As long as you hold down the pilot light once it is lit it stays lit but when I turn the nob to the "on" position (release the pilot light button) the flame...


It sounds like a thermocouple has gone bad. this is a very common problem with gas powered things ie; water heaters, furnaces, hot tubs. The telltale sign is when you release the pilot light button it won't stay lit. This is a safety feature and is relatively inexpensive and easy to repair.

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The thermocouple is bad. That is the part right next to the pilot light that sense's the flame and hold the gas valve open to the pilot. Take the old thermocouple off and go to hard ware store and get a 18" one of what ever length you need and replace. 5 dollar part.

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Propane heater wont work


I'm not sure about that model, but I think you have to hold that button down for a minute or more to "prime" it.

I have a different model coleman propane heater that sits on the 20# tank. Mine is probably getting rusty, last time I used it I had to hold that button down for a long time.

I'm looking for a new heater now myself, as mine won't stay lit outdoors in much wind.

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There must be a blockage in the hose and regulator or your large tank may be checking and not allowing the unit to stay lit. Remove the large bottle. Let the gas line equalize for about 30 seconds and then reattach the bottle. Very slowly, open the knob on the large tank and I mean very slowly. Did I say open it slowly. The new OPD propane tanks often have a very touchie excess control valve that won't allow enough gas through if opened too rapidly. Now tray and light the heater. If you still experience the same, get a technician involved so they can inspect the gas pressure.

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