Control Power In A DGAA07BDTA
Posted: Thu Mar 15, 2007 8:55 am
Hey guys,
Bought my place in December and doing a major reno. Not living there at the moment, thank God (as it is only about 15 deg F out now.
The furnace was working ok (minus short cycles, but that is the not the problem I writing about.)
So sunday I ripped out a window to replace it, but ran out of time, so I threw some vapor barrier over the hole for the night, and when I came back the next day, my furnace wasn't running.
Broke out the multi-meter, and found that I had line power going to transformer, but no control power coming out. Great..problem solved.
Bought a replacement, threw it in, and blamo...heat glorious heat. BUT it ran over the set point of the thermostat. I couldn't get it to shut off, and when I finally did get it shut off, it wouldn't fire up again.
Took the multi-meter out again, and found....No control power again! Line power is ok, but no 24 VAC.
I have read somewhere that transformers don't just die. If you find one has gone, troubleshoot further to figure out what is source of the problem. So my question is, before I go and throw in another $40 transformer, what is killing them?
Thanks in advance for the help,
Mike
Bought my place in December and doing a major reno. Not living there at the moment, thank God (as it is only about 15 deg F out now.
The furnace was working ok (minus short cycles, but that is the not the problem I writing about.)
So sunday I ripped out a window to replace it, but ran out of time, so I threw some vapor barrier over the hole for the night, and when I came back the next day, my furnace wasn't running.
Broke out the multi-meter, and found that I had line power going to transformer, but no control power coming out. Great..problem solved.
Bought a replacement, threw it in, and blamo...heat glorious heat. BUT it ran over the set point of the thermostat. I couldn't get it to shut off, and when I finally did get it shut off, it wouldn't fire up again.
Took the multi-meter out again, and found....No control power again! Line power is ok, but no 24 VAC.
I have read somewhere that transformers don't just die. If you find one has gone, troubleshoot further to figure out what is source of the problem. So my question is, before I go and throw in another $40 transformer, what is killing them?
Thanks in advance for the help,
Mike