I bought and hooked up a cheap digital thermostat ac worked before hand didn't work after.?

Question

rehooked up old still don't work what the world is wrong?

Answer 1

Did you shut off the power to the system before hooking up the thermostat? If you did not, you may have short circuited the wires and burned up the transformer. It takes 1/120th of a second to melt a transformer.

To test, access the wires from the back of the thermostat. The red wire is the power. Jump it to the green wire. If your indoor fan comes on, your transformer is still good. If the fan does not come on, you have a dead transformer. If you are fortunate, it may be a fuse that has opened up, rather than the transformer.

If the fan functions, jump red to yellow. this is the cooling. The system may have a short delay (up to 5 minutes), if after seven minutes the cooling does not come on, you have a problem that will need to be corrected by a reputable service company.

If the system does work, your problem is with the 'stat or how you hooked it up. If it was made in china, the stat may be dead in the box. not that uncommon. Take it back to retailer and get a replacement.

Keep Kool

Answer 2

what is thermostat set on? Check to see if you hooked it up correctly.

Answer 3

look up the wiring diagram of new one and wire it accordingly.whenever you remove wire its always a good idea to mark them and number them so that you know where they have to go when you rewire something.