Ask Experts Questions for FREE Help !
    jb001's Avatar
    jb001 Posts: 1, Reputation: 1
    New Member

    Dec 12, 2007, 07:46 AM
    Bryant furnace: thermostat showing "AC", house cold, fixed (for now.)
    System: Bryant 333BAV 80 plus furnace, 10 yrs old, with Honeywell Chromotherm III thermostat. No problems with either in the past. Minnesota. January.

    Upon waking up this morning, found the house was 58 degrees, with set point at 68. Checking the thermostat, found it was showing "AC" (power outage to furnace?). Breaker to furnace was not tripped. Checking the furnace, it appeared to have no power: no sounds, and not even the red LED in front was lit. I turned off, and then (right away) back on the power switch on side of furnace. No changes. Connected right below that switch on the side of furnace is a 2-outlet box. I went and got a trouble-light and plugged into one of the two outlets. Immediately upon plugging it in, the condensate pump (which was plugged into the other of the two outlets) started to run, for about half a minute. Also at that same moment, the furnace turned on: red LED lit up (solid ON, no "trouble code") in front, and fan and burner sounds started. Furnace has now heated the house up, apparently running just fine.

    I have a second (separate) furnace in the house, so can afford to wait and watch a bit.

    What could have caused the furnace *power* to shut off, and why did my simple actions this morning "fix" the issue, and how can I (or, can I?) troubleshoot it further?

    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Dec 12, 2007, 11:26 AM
    Check for a loose wiring connection or bad ground in the electrical wiring. I would start by looking in the 2 outlet box.

Not your question? Ask your question View similar questions


Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.

Check out some similar questions!

A/C or Heat does not work w/thermostat set "on" or "auto". [ 22 Answers ]

A/C or Heat doesn't work in "on" or "auto". Fan will not come on at the "on" position either. I changed the batteries in the thermostat. I also read somewhere to disconnect the "Y" and hold it to the "R" on the thermostat for two minutes. That will tell me if the thermostat is the problem. ...

Replacing old "General Controls" thermostat. How to determine what the wire do? [ 5 Answers ]

I am replacing an old "General Controls" thermostat, model T-90H110A137, 24 volts max, 0.8 AMP. The wires are labelled but not to the current standard of H1/H2/B/O/RC/RH/G/Y/W. how do I determine which wire is for what? The old thermostat controls a furnace and has a continuous fan option. ...

"Just for Copper" cold weld [ 3 Answers ]

At Ace Hardware (and probably other places) there is an item called "Just For Copper" which comes in an Elmer's Glue like plastic bottle. It is a cold weld for copper pipes (brass too) under 2". I have used it in places where I am temporarily putting on an end cap on. It is easy to use since you...

Installed new bathtub valve stems now "no cold water" [ 5 Answers ]

I have just replaced both hot and cold valve stems in bathtub. I did them exactly the same and now I can't get the cold water to come out. What can I try to do to fix this problem. Someone said I should have the valve open when installing? I am desperate and exhausted please help!! :(

Heater blows cold when "On", not at all on "Auto" [ 1 Answers ]

Our gas heater is 7 years old, and has worked fine in the two years we've rented here. This winter though, we can't get it to work consistently. When on "Auto", it doesn't turn on at all, no matter what temperature we select, and when we turn the fan to "On", it simply blows cold air. It...

View more questions Search