I have a Lennox G40XH(X) series furnace and my ignitor never turns on (never burns). The fan comes on momentarily and then shuts itself off. The LED lights are flashing in fast mode which makes me think it's the ignitor... but because the fan shuts off so quickly, I think it may have something to...

Had cold snowy days and furnace will shut off before reaching set temp. The exhaust pipes were in the direct path of the blizzard. I can't see any ice blocking but there is a large chunk that appears to be from one of the pipe.

Lennox mod GZ4m3/4-120A-4 Ser 6395M52686 12/95 Board LED shows firing sequence, Gas valve opens, igniter doesn't spark, gas valve closes approx 8 sec. later then retries twice more. The furnace can be ignited with lighter during this sequence and appears to burn normally for approx 8 min....

Hello, I have problems with my Furnace. I currently have a Lennox G12RD2-82-3 from 1980. Last week I replaced the furnace blower but now the furnace won't ignite. These are the conditions: --the pilot is always on -- I have replaced the thermocouple --the thermostat is OK --the blower kicks on...