Page 1 of 1

Coleman 3400A812 blower wiring

Posted: Mon Mar 02, 2020 9:51 am
by Jeff Rose
We have an old Coleman 3400A812 electric furnace. No ac but it does have an ac switch installed. The blower seems to be on low speed and the blower speed switch doesn't seem to do anything. I would like to just wire the blower to run on full speed but the wiring is a mess and does not match any schematics I have found. The blower is a 3400 4(or A) 690. Someone has messed around with the wiring in the past. The coils and sequencer are correct but the fan switch areas are a mess. I would appreciate any help in wiring the blower to be on full speed all the time.
Thank you