Cozy Furnace Pilot Shuts Off

Old 12-13-22, 11:41 AM
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Cozy Furnace Pilot Shuts Off

Thanks for taking the time to read this.

Pilot turns off when gas valve shuts off. In other words, when the thermostat trips off, the gas to the heater turns off, and the pilot goes out too. Not every time, but maybe 80-90% of the time. Pilot flame size and TC coverage in image attached. Pilot stays on indefinitely (at least 5 days) without turning the thermostat tripping on/off.
Furnace details and things I've tried:
  • Cozy DVCF 403B-H
  • Natural Gas
  • Inlet pressure is 3.5" W.C.
  • Replaced the Thermocouple
  • Opened up the pilot valve more.
  • Removed, tightened, and replaced all electrical connectors on the gas valve, gas switch, limit switch, and auxiliary limit switch
Things I'm considering but haven't done yet:
  • clean out the pilot orifice and gas line. I'm not sure this is necessary given how large the pilot flame is.
  • replace the gas control valve
  • Opening the gas control valve to investigate the internals.
  • find and fix drafts. it seems like there is a significant amount of wind or pilot flame motion when the heater turns off. It takes maybe 5-10 seconds for the pilot to stabilize. I wouldn't be surprised if the pilot just blew out.
Any ideas for what might be causing this issue? I'd rather not spend 300$ on the control valve or $1500 on a replacement furnace. Especially if the issue is something related to drafts.

Thank you!
Old 12-13-22, 01:54 PM
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I don't recommend taking gas valves apart.
I'm concerned about the pilot flame being blown around.

Does the actual blower have any effect on the pilot flame ?
How old is this wall heater ?

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