Gas and Oil Home Heating Furnaces - Furnace burner will not ignite

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tran
11-19-08, 12:09 PM
Hello Guys,
How all doing?

System: Carrier 8000ST
When Heat was Turn ON
1. blower power up for a couple min.
2. system call for heat (inducer)

Burner wont ignite.
According to led code: It is low heat pressure switch problem.

My question:
Is there other possibility? and how do testing the pressure switch by using the ohm meter?

Thanks for your help
Tran

Grady
11-19-08, 09:19 PM
Sorry, I've never heard of a low heat pressure switch. Do you have a wiring diagram you could copy & post?
goldstar
11-20-08, 12:03 PM
Look at your book again. I suspect it refers to the vent pressure switch. I can tell you that my son in law had this problem last week on a Goodman, and it turned out that the condensate drain line was plugged which caused the pressure change. Cleaning it and the trap cured his problem.

Also, look for a small vacuum line running from the inducer blower to the pressure switch. When the inducer is running, remove the line at the inducer fan and suck on it continuously. If the furnace then lites, the switch is okay and you need to do a cleaning as described above.