Robert
I assume you don't work for Coleman or York Intl .
I have copies of the Safety Bulletin and it states models coleman,Coleman Evcon Red T model numbers DGAT070XXXAND DGAT075 NATURAL AND PROPANE have safety recalls .
These were manufactured 1997-1998-1999 .

No need to answer

Robert without getting too emotional (and I am on this subject) the heat exchanger design is suspect on many models . The two recalls --attempt to beef up the inner walls and the replacement heat exchangers on the DGAA090 now require another part addition . The point is the heat exchanger design is ...

See Roberts earlier suggestion about spiders and orifices.

Robert

The wiring diagram is actually a block diagram and lacks board connectivity .
How do I contact the actual ICB supplier ?

The xformer supply is 24VAC with no load . Lift the hot side off on the secondary winding and measure across the windings. Also look for a loose white neutral wire . If there is 24vac then place the hot side back on and remeasure the Voltage to see what the drop is . According to several wiring diag...

This series furnace may have a recall listed to replace the heat exchanger . Contact your HVAC vendor or search on the YORK or Coleman website.
This recall is several years old .

Robert Yes I would appreciate an actual wiring diagram of this board due to many failures on this furnace design. In several nearby communities homeowners had to replace the heat exchangers due to high heat causing cracks in the exchanger. Coleman attempts to blame the problem on incorrect filters a...

You can test the limit switches with a simple radio shack ohmmeter,lifting one lead off the individual switches. They should have very little resistance under 1 ohm . Or jumper each switch one by one . Be sure to turn off the furnace power , add the jumper strap and turn power on . On other posts ab...

DGAA-090BDTA Missing in the description of operation is a failure of either of the two LIMIT switches. The diagnostic code 4 flashes indicates a failure . I tested both limit switches several times and find them both closed . If I remove a wire in the #3 to #8 path from the high limit switch to the ...