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dwkreis 11-06-2007 07:56 PM

Transformer Question
I have a Rheem heat pump, an all electric system. yesterday we tried to turn on the heat and nothing worked. After checking and reseting the main circuit breaker still nothing.

I pulled out my mutimeter and read out the R on the termostat which was 0V. I opened up the unit to check the Control Transformer and found it burnt. I replaced the old transformer with a new one. I connected everything except the 24V wire to the termostat, I read 26V. I then shut down the power attached the 24V wire. I turned on the power and let the smoke out of the new transformer. Any thoughts on what is causing this?

Thanks in advance for your help. This is our first house and we are a military family so needless to say money is tight.

Thank You

cjett 11-07-2007 10:11 AM

I find most of the time it is the 24v control wiring going to the outdoor condensing unit. It gets chewed up with a weed eater or animals ect. It usually exits the house taped or strapped to the refrigerant line set. Check it for frays or breaks. If you know how to use a multimeter you could check for continuity or shorts.

dwkreis 11-07-2007 10:57 AM

thank you

i checked the outside lines. no nicks or cuts. i'm going to set myself up now to do the continuity checks on the 24v system. hopefully i'll find something. the house is getting cold.

cjett 11-07-2007 11:30 AM

Yeah, you have a dead short somewhere in the low voltage system. You can rule out the wires going to the condenser by removing them at the furnace and then restart the furnace. I would also recommend buying the next transformer that has a fuse built in or installing an in-line fuse on the secondary side of the transformer. That way while you are trouble shooting you will just have to replace the fuse and not the transformer. Good luck, and let us know what you find.

dwkreis 11-07-2007 01:34 PM

stupid mistake
I feel like a complete moron. On the new transformer the secondary side common was a blue wire, the 24v was yellow. I had hooked up my first replacement transformer backwards. today I rechecked everything and installed the transformer everything works great. I was in a hurry last night because I needed to get back to work on base, stupid mistakes uhhhh. But all is well now thank you so much for the help.

cjett 11-07-2007 01:36 PM

Glad to hear everything is working.

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