Have a coleman evcon electrical furance for mobile home.We had to last year turn the breaker unit on the furance off and on it would work and in middle of night it wouldn't come back on.Most times it would take several times of doing that before it would come on and work. Sometimes it would work all night and would have any problems.I have replaced both heating elements. The heat will not come on. When I turn it on 'ON' AND heat on thermostat it works but doesn't heat up. When I turn it on auto on thermastat it comes through motions on unit but doesn't come on at all. No heat this year. Can't afford repairman any sugguestions.

I would start with the heat sequencer. It times the blower and heating elements on in stages.