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Old 10-26-2010, 12:12 PM   #1
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thermocouple volve


Hi, this spring shutted off the gas on my heating system and in the fall couldn't light the pilot. Replaced the TC (even it masured 25 Mv when hot) but no result. Replaced the valve, system working...Because of my 40 years of electronics exp took apart the valve and checked, no visible problem found..Just curious why it doesn't hold the first valve...Any ideas, thanks


Last edited by silvermike; 10-26-2010 at 12:43 PM. Reason: grammar
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Old 10-26-2010, 07:48 PM   #2
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Mv's are measured 2 ways. 1 is out of circuit ( just checking t.couple) the other is in circuit with an adapter. If the t.couple measured 25 mv out of circuit it would have measured 12.5 in circuit . With a good strong pilot the t.couple should measure 30 mv's out of circuit. Your pilot safety may have gone bad in the old valve using up your mv's

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Old 10-27-2010, 08:56 AM   #3
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the old TC is working well with new valve system, something went rong with old valve...took apart...measured all connections...the coil...attached a new TC...heated on gas stove...not working
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Old 10-27-2010, 02:32 PM   #4
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thermocouple volve


If the pilot won't hold . It's because the (magnet) pilot safety (the part the tc screws into) is bad
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Old 10-28-2010, 08:59 AM   #5
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hi, what do you mean "bad"? the tc has to terminals - one is the body, another (central) is insulated from the body and shows infinity when the valve is removed from the body.
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Old 10-28-2010, 11:19 AM   #6
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thermocouple volve


That would be the pilot safety within the valve
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Old 10-28-2010, 12:06 PM   #7
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thermocouple volve


Is it possible to have a picture of this element and how can we test it, thanks
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Old 10-28-2010, 02:47 PM   #8
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2nd page on the left side figure 3


http://www.robertshawtstats.com/spaw...sandPilots.pdf
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Old 10-29-2010, 07:49 AM   #9
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Thank you very much
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Old 10-29-2010, 08:04 AM   #10
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Your welcome
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Old 10-29-2010, 01:46 PM   #11
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thermocouple volve


I removed the valve and made a couple revolutions...put together ...attached the TC ...heated the end on gas stove flame many times...working perfect...
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Old 11-06-2010, 12:00 PM   #12
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Any idea - can I keep it as a spare? Thanks.
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Old 11-06-2010, 08:04 PM   #13
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valves aren't designed to be taken apart or field serviced.. You may not have put everything back together to make the safety work as it should.Personally, I wouldn't use it after it has had been taken apart

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