Hi, before describing the problem, here's my furnace specs:
Model: GUI075A012BIN (everything says Inner-City Products... also says RPJ II)
Serial: L951611014 (1995 date makes sense... same year this TH was built)
Input BTU: 75K
Capacity Output BTU: 60K
In the middle of the night last night, we felt cold air blowing from the vents, and at around 3am, the thermostat said the air temp was 64 (we set it to 70), so we just shut it off. By the time we woke up a few hours ago, the temp was at 61 (still there now). I've tried shutting off the power and gas to the furnace, then turning them back on, and running the system. Each time, it turns on, takes close to 10 minutes before blowing any air out, and then the air being blown is cold... then just continues blowing cold air until i shut it off at the thermostat. I've read that it's supposed to automatically shut off if not working properly, so I let it run for at least a half-hour... didn't do it automatically, so i did it manually.
A couple quick observations:
1) can't see any light flashing through the viewport
2) one website said to look for rollout switch and press button on it to reset. i see the switch on top of the burner box, but there's no button.
3) out water heater is gas as well, and we have very hot water this morning, so I'm pretty sure it's not a gas issue.
Any ideas of what might be wrong or what things I can look at to help determine what's wrong before deciding to call an expert?
Thanks in advance.