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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 20931
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I have an old GH5-135M furnace in my shop. The pilot will

Customer Question

I have an old GH5-135M furnace in my shop. The pilot will not stay lit. I've replaced the thermocouple twice and it makes no difference. Could it be that little plunger the thermocouple screws into? I'm not sure what else it could be.
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can

continue our conversation.

When does it go out? when you try to light it or randomly? do you have a strong pilot?

Customer: replied 1 year ago.
Strong pilot, but it won't stay lit when I try to light it. As long as I'm pushing the button, it will stay lit, but after I've held the button down for an appropriate amount of time, the pilot goes out when I release the button.
Expert:  Rick replied 1 year ago.

If you have a strong pilot then you may have a bad gas valve

Customer: replied 1 year ago.
Strong pilot
Expert:  Rick replied 1 year ago.

Sorry I missed that. Here's my edited response again.

If you have a strong pilot then you may have a bad gas valve

Customer: replied 1 year ago.
Thanks, I'll check that out. Have a good day.
Expert:  Rick replied 1 year ago.

You're welcome. If a new thermocouple doesn't resolve this then the only other possibility is a faulty gas valve since sounds like you have a good connection at the valve.