I am in desperate need of help.
I turned off my thermostat (not from the fuse box outside)---I unscrewed the box and the wires. I was going to try to install my new thermostat. The old unit is 7 wires and the new is 6, so I was completely confused, so I decided to put the old thermostat back on. While putting the old one back, two of the wires touched and sparked. Now nothing will work. I went out tot the fuse box and flipped that switch--then flipped the fuse in the attic. Still nothing. My husband just went out of town and he is going to be so upset with me.
Help!!

Tell him a lot of men have done the same thing

You have fried the transformer with is inside the furnace/airhandler
This was done when you didn`t turn off the breaker to the furnace
Don`t know if you should attempt to find and replace the transformer,, let us know if you want to attempt a transformer swap-out

The sad thing is, I called an electrician friend and asked if I should flip the breaker--he said NO. Should have gone with my gut feeling. I went out and bought a new thermostat. You think for sure, I fried it when the two wires touched and sparked. Dang!! If replacing the transformer is fairly easy, I will sure try. I live in Texas and it's already hot in my house. Would it be expensive to have it fixed. Should I try the new thermostat---with the breakers off :)

I'm going to slightly disagree with wmproop.
1. You could have fried the transformer (one possibility)
2. There is sometimes a 3A automotive style fuse on the circuit board for the furnace. If it's installed, it should protect the transformer.

There should be a wiring diagram when you remove the access door. You might want to post a pic of that diagram using go advanced/manage attachments.

Not likely the thermostat.

Keepitsimple----So do you think I fried something?

Oh, and the house is only 7 years old. Does that make a difference on the transformer?

Either the fuse or the transformer. Transformers are typically 40 VA, 120 V primary and 24 V secondary. Mounting can be different. Depending on the furnace, they may have to be phased properly. Really means if the furnace generates a "reverse polarity" error, you switch the secondary wires.

I will get up in there in the morning and take pictures.
Thank god I have 3 fans to run tonight :)

Make and model number of furnace might help.

Lennox cb30M-46-1p??

These numbers are for a heat pump, we need the numbers off the furnace/airhandler

I did see a sticker on the outside that said --component arrangement--is that the diagram?

Thank you so much for your help--you have no idea how much you are putting my mind at ease---i am enjoying learning all of this :)
I am a girlie girl, yet I prob should have been a man--I do all the manly things around the house and with our cars :)

Quote:

---

Originally Posted by wmproop

these numbers are for a heat pump,,we need the numbers off the furnace/airhandler

---

What about
s/n 5803A 20330

The other number is the filter number--bmac-20ce

I was thinking electric furnace/airhandler,,