Question about Hayward 150000 BTU Millivolt Natural Gas Heater

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Pilot wont stay lit when i release push down button on gas valve

Had pilot generator replaced and also replaced gas valve. Pilot flame is strong ,gas pressure good. Am i wrong in thinking that the control circuit is not a part of the pilot staying lit. Was thinking a wire could be grounding out shuting down valve so i disconnected all wires from gas valve leaving just the generator wires connected pilot goes out as soon as i release button,by the way i also tried another new pilot generator same results. Does any one have any ideas?

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Are you certain you are connecting the generator to the correct terminals? Is the pilot head partially blocked not allowing the flame to reach the generator even though the pilot is lit? Can you read the millivolts on the generator leads? Is the reading 400mV or higher? I assume it will be with a new generator but if it is not then the flame is not across the generator as it should be. If it is, be certain you are connecting the two leads properly and in the correct order. The generator has polarity so it needs to be connected to the valve properly. The tag up inside the heater should give you the correct locations for the white and red wires on the valve.

Posted on May 29, 2010

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well if you have 6.2 psig at the valve that is your problem. most valves will only take an inlet pressure of 14" wc or about 1/2 psig. as pilot gas comes out of the valve with no regulation it would be blowing like a son of a gun. so if you have 6 .2" wc,water colum you are in good shape. have you tried to jumper the limit connections? a paper clip would work just fine. but if it does work no fair leaving it in place as a great danger may come your way. tell me what the pilot looks like blue and sharp or yellow and layz. there is a magnet in the valve that the thermocouple screws into but these dont often go bad.

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What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
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As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TV work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
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Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

MackB

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