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I upgraded my thermostat to a digital one. when i removedd the old one only the red and white wires were used. i also replaced the thermostat wires. i hooked up all the wires according to color red to r, white to w, etc... there is no a/c unit, heat only. this is a coleman gas furnace model # DGAH077BBSB. the old thermostat also had fan on and auto fuction switch, but the fan would not ooperate continuously in the on position. the fan still will not operate in the on position does this model furnaace support continuous blower motor function?

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i upgraded my thermostat to a digital one. when i - 73dd0b2c-2c43-4bb0-bae3-3442bd37e755.pngdaa78e14-af8e-4fec-a854-c8b30f7c0ad8.jpg
As your unit had just 2 wires, Red and White, you had just heat only with no AC and no fan on as described as you have no green circuit wired up at the furnace or thermostat, you can add a relay if not equipped but that would make your unit very old.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

Therinnaiguy
  • 1420 Answers

SOURCE: Coleman furnace blower runs continuously

You should be seeing 120 volts to the igniter. Anything less requires either a replacement of the transformer, start relay or control module.

Posted on May 30, 2008

machtcl1
  • 61 Answers

SOURCE: blower stays on with new themostat

Check to see if there is a short between the green wire and the red wire. Green is the fan control wire for AC. Sounds like some wires may be touching. How did the old t-stat get fried?

Posted on Jan 02, 2009

  • 2464 Answers

SOURCE: blower won't shut off on heat or cool cycles

Hi it souds like the afc is not working check the setings on it or clean the back of it /or replace

Posted on Feb 17, 2010

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