furnace won't stay lit, just replaced the thermocouple?

Question

We had a man come out and fix our furnace, he replaced the thermocouple in it. The pilot light is still going out after the heat kicks off. What's up?

Answer 1

it's sounds like it's time to change out the gas valve

Answer 2

if i try to fix a furnace, and it still doesn't work, i can't very well charge someone for the work done, now can i? i would recommend talking to your gasfitter about this, and have him come back and try again.

it could be a venting issue with back pressures, or the pilot could need adjustment. a pilot light that is too low will not create enough electricity to keep the gas valve energized if there is constant flickering of the flame (from a drafting chimney).

Answer 3

It may be as simple as he didn't adjust the pilot light high enough to properly cover the new thermocouple. He may just need to raise it a bit.

Answer 4

It sounds like the pilot assembly is dirty. The pilot orifice and assembly should be cleaned then check to make sure the flame is right. For a step by step troubleshooting guide, check out the furnace page at www.hvac-for-beginners.com

Answer 5

Maybe it isn't the thermocouple but, the main control unit. Sometimes these will act in the same manner.

Answer 6

check the flue pipe carbon monoxide will put put the flame on the pilot and it will act like a thermocoupler very dangerous

Answer 7

You need to call the repairman back.

Answer 8

sounds like you need a new gas valve. i wouldnt recommend doing it yourself because you need to set the new gas valve in timing with your gas meter.