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.
Hello all, I'll try to make this short. I have a mid 1990s Miller fuel oil furnace with the Beckett burner. I recently had a local oil company come clean my furnace. When I got the $180 bill it said the furnace was vacuumed and a few other things I knew the technician didn't do or replace as I was standing right there when he was cleaning it. Since he didn't do as the bill stated I called the company and spoke with the owner. He stated all those things should have been done. He sent the same technician out to do it the right way, which he did . Is there something he may have adjusted something incorrectly to make the furnace much louder when it starts up and shuts down? It has been not starting also quite often and I have to push the reset button for it to fire. The other day it quit. I changed the nozzle and bled it. It fired right up, but is still doing what I had previously stated. Thanks in advance!!
12-13-22, 11:41 AM
