Amman air command 80. Gas
noise stated sat and thought it was the blower motor but found out it
was the vent blower and it went to pieces on Sunday evening. Went today
and bought and replaced that vent motor. Fasco had replaced it with
another model so I had to change the mounting holes but seemed to work
out all right put it all back together and the burner comes on and
about 30sec later the fan comes on another 30 sec it shuts the burner
and fan down and starts all over again but after the fan comes on it
last about 20sec next cycle about 15sec. My limiter is set at 80, 135,
200. Looked at all connection seemed to be fine. Also vacuumed it out
while it was down. Appeared to have vibrated a lot before the fan went
out. Any and all help is always very much appreciated. Sean
I don't have your furance but from what I understand, the burner
turning on means that all the things checked prior to ignition should
be ok. The next step is to verifiy the burner is on, prevents gas
leaks, that might mean you have a dirty eye.
Now just a guess, the safe thing is to have your furnaced serviced.
tom @ www.BlankHelp.com
Do you have a pressure feedback setup? A coworker recently had the
same symptoms. His furnace monitors for pressure buildup in the vent
line and will try to run but shutdown if there is too much
backpressure. Turns out the installer didn't put the screen in on the
outside of the house to prevent vermin from getting in. During these
cold months it's an obvious entry point to your house. He had a small
nest in his vent line; cleaned it out and everything ran fine. You
might want to check that possibility.
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