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Old 02-01-2010, 12:25 PM   #16
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help!! could it just be the pilot


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Originally Posted by joetab24 View Post
We got the pilot light on, all of the electrical connections are working, valves are opening but the furnace won't fire up. My father-in-law thinks its the thermocouple but we are having a hard time getting access to it. Should I leave the pilot on?
If the pilot stays lit, then It's DEFINITELY NOT the Thermocouple! As I said in a prior post, the function of the Thermocouple is to prevent the gas from leaking when the pilot does not stay lit, for whatever reason!

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Old 02-01-2010, 06:59 PM   #17
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help!! could it just be the pilot


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If the pilot stays lit, then It's DEFINITELY NOT the Thermocouple!
Strange. I've had more then 1 thermocouple that wouldn't open the main valve. But was strong enough to keep the pilot open.
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Old 02-01-2010, 08:35 PM   #18
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help!! could it just be the pilot


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Strange. I've had more then 1 thermocouple that wouldn't open the main valve. But was strong enough to keep the pilot open.
Now, I'm not saying NEVER! But in my (limited) experience it's been (whenever the pilot was lit and the main Gas valve didn't open) either a faulty Main valve or some other safety lockout like a damper or a spill switch.
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Old 02-01-2010, 08:47 PM   #19
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help!! could it just be the pilot


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Now, I'm not saying NEVER! But in my (limited) experience it's been (whenever the pilot was lit and the main Gas valve didn't open) either a faulty Main valve or some other safety lockout like a damper or a spill switch.
Yep. I've had stats that would be too restrictive also.

Often, it is the gas valve that is bad.
But it sure does bit if you install a gas valve and 2 to 4 weeks later they have no heat again. And you change out the thermocouple and it works fine after theat for the rest of the heating season.
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Old 02-01-2010, 08:54 PM   #20
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help!! could it just be the pilot


There are two low voltage wires that lead from the zone panal to the gray pump relay on the right rear of the boiler. If you open the gray box the wires should tie to TT termonals. You can jump across thoughs and if the boiler starts it is in the zone panal or zone valves.
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Old 02-01-2010, 09:11 PM   #21
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help!! could it just be the pilot


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Now, I'm not saying NEVER! But in my (limited) experience it's been (whenever the pilot was lit and the main Gas valve didn't open) either a faulty Main valve or some other safety lockout like a damper or a spill switch.
repairman said the damper was preventing the valve from opening 100%. he opened it.

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