Coleman Furnace Lighting Issue

Old 01-25-22, 12:48 PM
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Coleman Furnace Lighting Issue

Hi everyone,

I have an 8 year old Coleman furnace that is having ignition issues. What happens is the furnace fan turns on as normal when heating is required, and then gas begins to flow in. After that the furnace might light, other times it does not. Sometimes it will light after the second or third attempt. If after three attempts it doesn't ignite it locks out as it should, and I have to turn the furnace power off and then on again to reset it.

Attempted fixes have been to clean the flame sensor which didn't help. Then we changed out the ignition switch which didn't help either. Next recommendation is to swap out the motherboard. Wondering if I am on the right track here or if I should try something else? Thanks!
Old 01-25-22, 04:39 PM
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Welcome to thew forums.

It's important that the furnace follows a logical start up order.
Try reading this...... Please read first for furnace repairs.

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