1. L

    Thermostat Digital Screen is Blank - Is it the AC Unit or the Furnace? How do I troubleshoot?

    80UHG Series The thermostat runs both the AC unit and the furnace. There is no reading on the digital screen. I used a voltmeter to determine that it is out because no voltage is going to the thermostat. I've researched a bit and found out it may be due to a blown fuse in one of the units. How...
  2. M

    Gibson/Nordyne Furnace KG6RC-040C-12A won't power up

    My furnace keeps turning off and losing power to the control board. The control board lights are off. One time I cycled the power and it powered up. Haven't been able to do that since. So, I replaced the transformer which worked, but it started happening again a week after the replacement...
  3. Mastro

    Armstrong Furnace Blower issue

    Okay, I have this Armstrong Furnace. The blower fan (label below) stopped blowing. On top of that, there were sparks coming from one of the bolts (circled below). The sparks ate the rubber washer. I "rebooted" the furnace, by turning the thermostat 20 degrees below house temp & hit the...
  4. D

    RUDD Achiever Super Quiet 80 Burner issue

    My RUDD furnace has been running for 3-5 minutes turning off, then back on several times until the house is up the the temp on the thermostat. Today it wouldn't start at all for my wife. I opened the cover and noticed that the part inside the burner tube is missing for one of the burners. Its...
  5. P

    Ruud Furnacw won't ignite

    Pilot is on, new thermostat reads "heat on", won't ignite burners. Guy at the store said the thermal couple isn't the problem if he pilot is lit.?