Have HVAC Questions? Ask an HVAC Expert for Answers
What is model on new thermostat? Does it have an O/B terminal?
If you can provide me a picture or a list of where each wire went on old thermostat and model of old thermostat,I can help you get this in operation pretty quickly.
Is your outdoor unit a heat pump? If not sure, give me model number on it
OK lets do this. Wire as follows.
Red to R with a jumper to RC
Green to G
Yellow to Y
White to AUX/E
Blue to O/B
Brown (which was not used ) to C.
Go to indoor unit and connect that brown to common.
The wifi stat is going to require a common wire.
THat is not a brown wrapped around the bundle? As that just the sheating wrinkled?
You will have a C terminal. That is common
OK what we have to do is find common.
This should be pretty simple to do.
Look at the transformer. It will have 2 high voltage power wires and 2 low voltage wires. The low voltage will go to the board most likely.
The two low voltage wires will be 24v hot and 24v common. One should go to the same terminal Red from thermostat does. The other one will be 24v common. If you can back up about 2 feet and get me a shot of transformer and wires, I might can see it better.
Excellent.This bue off of transformer is 24v common. Connect that brown from thermostat C to this blue anywhere you can.
WE may have to set the thermostat to match the system. Tell me exact model on the wi fi thermostat
Do you know how to enter system setup menu?
See page 51 in this manual
Select the following:
0170 - 7
Any other functions are at your discretion.
If any functions listed do not show available, this means thermostat has setup based on a previous selection.
Do you happen to have a meter ? Also tell me if COOL comes on thermostat solid or flashing.
Was unit working before you started changing thermostat?
Hmm .Is there a fuse anywhere in the air handler or did you see any spark while messing with wires/
If you can get a meter I can guide in finding out why we don't have power to thermostat.
You connected the brown to C on thermostat and blue from transformer right?
Do this. Remove the R and G wire and touch the wires together and see if blower will come on
WE might need to get a meter to make sure there is 24v between the red and blue we are tied into.
Yes , there is not a C on old so just tape it off.
I am in and out all day.Just come back to website.
Make sure we have a meter that shows actual voltage not just a tester that says whether we have voltage or not.
You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.