Have a heater in my shop( colman /evcon ) for 7 - 10 years . New thermostat calls for heat fires up and blower kicks on ,than for about 20 sec, later.. flame goes out, doesn't reset .if I kill the power and than restart system than it will say on all day . Had a professional co. come and replace the control board, limit switch. initiator. Still have no heat Please help john

Hi, jjcantarella!

Since your question has to do with a heater rather than a piece of furniture, I've moved it to this forum topic area where it will be more likely to be noticed and addressed by our Heating & Air Conditioning Experts.

Also, I did need to remove your email address from your post. Once a thread has been started, it's important that all information stay on the thread so that others with similar question can benefit by the information that's exchanged. I also would hate to see you get spammed because your email address was exposed here.

Thanks!

Exact model #? NatGas or LP? If ignition cycle(s) are so brief, possibilities are somewhat limited but more info will help streamline even further. I would make sure flame sensor & main burners are clean, and check gas pressure, for starters.

Clough agrees: Great images and excellent inquiries!!Thank you, nice of you to say so. I do try... :D