Hello, Check the pressure switch and the little hoses going to the pressure switch. If the pressure switch does not get a vacum from the blower it will not let the furnace light.
If this is a high efficiency furnace and has plastic exhaust and intake there is usually
a screen inside the duct at the top of the furnace, if that screen gets a small leave or rubbish trapped on it. It will cause it to trip on pressure switch fault. Clean it and it should end your trouble
Answers & Comments
Hello,
Check the pressure switch and the little hoses going to the pressure switch. If the pressure switch does not get a vacum from the blower it will not let the furnace light.
Heatman101
If this is a high efficiency furnace and has plastic exhaust and intake there is usually
a screen inside the duct at the top of the furnace, if that screen gets a small leave or rubbish trapped on it. It will cause it to trip on pressure switch fault. Clean it and it should end your trouble