Coleman DGATO75BDE furnace FLASHES 3 TIMES - Coleman Heating & Cooling

SOURCE: have a coleman evcon furnace

Your centrifical swith is stuck open on your blend motor. I found that removing the blend motor housing and spinning the stuck motor (from setting over the summer) will get you out of a bind ,.but you may end up needing this centrifical switch (locatedon the bottom of the blend/fresh air intake) motor replaced.

SOURCE: Coleman Evcon Furnace Model G8T10012UHB11A

you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

SOURCE: furnace code light flashes 3 times /pressure switch stuck open

Check the intake and exhaust plumbing for any obstructions. I had same issue, turned out to be ice in the air intake plumbing on outside of house. This may be the problem. The pressure switch can be tested by pulling hose from purge motor that goes to switch and applying a small amount of suction. The switch should make a clicking sound.

SOURCE: My furnace Coleman DGAT070BDD light flashes 4

Trying to find out what 4 flashes on the internet will be exhausting. However if you have the manual it is explained under trouble shooting. If not, look for a wiring diagram and an error code chart will be on the diagram. Sorry I could not be more help.

SOURCE: Coleman furnace -- fan runs, ingniter won't light,

My furnace did not have a reset switch on that particular limiter. I unpugged the switch, it had 2 wires, waited 15 seconds or so and then plugged it back in . Turned the furnace back on and the limiter reset itself.