Question about Coleman Heating & Cooling
I had a similar problem in an old Coleman heat pump. In cooling mode it would put out heat instead
of cool air. The problem was on the relay board in the outside unit. There was arcing between pins
which caused the reversing valve to operate so it operated as a heat pump. My solution was to
remove the relay board and remove any copper traces that carried 240 volts and solder wires to the
remaining trace and make external connections to the wires that went to those pins so that the pins
on the board connector were no longer used. This solved the problem for me but would take some-
one with knowledge of electronics to do the work. Above all, be sure to turn off all power before any
work is done in the outside unit. The pins involved were the four on the left edge of the board when
viewed from the outside of the unit if my memory is correct.
Posted on Mar 31, 2009
I would check the control wiring. At some point two bear wires are touching. When the cooling mode is energized it is causing the heat relay to also pull in. Check for visible damage to insulation at any point where two wires can make contact with each other.
Posted on May 25, 2008
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Posted on Jan 02, 2017
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