Hoping this forum can once again save my bacon. Jagans, Marty S., are you out there?
I have a 10 year old 90+ Heil furnace in my attic that died last night. I'll try to give as much information as possible so apologies in advance for the long post.
The furnace itself is of the N9Mp1 variety and it is installed "horizontal left through top" similar to Figure 16 in this PDF.
http://icpindexing.toddsit.com/documents/086477/44001102402.pdf
It was running fine last night. When I woke up this morning the upstairs level was 57F and the breaker to the furnace had tripped in the night. Outside temps were about 19F here in NJ last night.
It's been recently maintained, all hoses seem in good condition and as recent as last November I put a new exhaust motor in it which is turning freely still.
When I turned the breaker fuse back on the furnace tried to startup but it's not firing the gas, the igniter does not come on and the exhaust motor never spins up. Instead the honeywell smart valve flashes 3 steady lights which the manual says is a pressure switch problem "open when they should be closed".
System goes into 5 minute delay period, another cycle begins at the end of the 5 minutes. It does this repeatedly.
So I took the small 1/4" hose off the transition assembly (the box behind the exhaust) and sucked on it while cycling the unit. The small black hose running to the pressure switch in the attached photo. Everything came on, the burner lit, gas lit, and of course I had to immediately shut it down but seems like everything's working. Meaning I don't think it's a faulty pressure switch.
I checked the hoses but cannot find an air leak. What should my next step be?
I have a 10 year old 90+ Heil furnace in my attic that died last night. I'll try to give as much information as possible so apologies in advance for the long post.
The furnace itself is of the N9Mp1 variety and it is installed "horizontal left through top" similar to Figure 16 in this PDF.
http://icpindexing.toddsit.com/documents/086477/44001102402.pdf
It was running fine last night. When I woke up this morning the upstairs level was 57F and the breaker to the furnace had tripped in the night. Outside temps were about 19F here in NJ last night.
It's been recently maintained, all hoses seem in good condition and as recent as last November I put a new exhaust motor in it which is turning freely still.
When I turned the breaker fuse back on the furnace tried to startup but it's not firing the gas, the igniter does not come on and the exhaust motor never spins up. Instead the honeywell smart valve flashes 3 steady lights which the manual says is a pressure switch problem "open when they should be closed".
System goes into 5 minute delay period, another cycle begins at the end of the 5 minutes. It does this repeatedly.
So I took the small 1/4" hose off the transition assembly (the box behind the exhaust) and sucked on it while cycling the unit. The small black hose running to the pressure switch in the attached photo. Everything came on, the burner lit, gas lit, and of course I had to immediately shut it down but seems like everything's working. Meaning I don't think it's a faulty pressure switch.
I checked the hoses but cannot find an air leak. What should my next step be?