Have HVAC Questions? Ask an HVAC Expert for Answers
Hi, how are you? Is this a split system or a package unit? Can you supply me with the model and serial numbers of the equipment? Also, do you have access to a volt meter and feel comfortable taking voltage measurements? Thank you.
I wanted the model and serial of the actual hvac equipment not just the thermostat. The model and serial of the equipment will be on a data tag on the units. Do you know if it is a split or a package system? A package system will have everything outside with no indoor unit. A split will have a condenser outside with a indoor unit inside. Without a volt meter it will be difficult to diagnose. The thermostat should just pull off of the wall and will have a model number on a tag on the back of it.
The thermostat pulls straight off the wall usually. It is usually pretty tight. Can you send me a picture of the thermostat and a picture of the outdoor unit? Then I will walk you through a couple tests to try without a volt meter. Thank you.
Thank you. Your thermostat pulls directly off the wall. It will tight. But it pulls straight off and snaps back on. Pull the thermostat off the wall and place a jumper between the R terminal and the Y terminal. Let me know if your outdoor unit starts up or not.
A short piece of wire. The terminals may be RC and RW either should be fine to jump from. But a jumper is just a term for a short piece of wire used to jump your control voltage from the R terminal to the Y terminal which is what your thermostat does in order to bring on the outdoor unit. This test will tell us if the issue lies with the thermostat or some other point in the system.
It is 24v so it will not be harmful to you.
Have a paper clip?
Well, if you want to disconnect them, you can unscrew the Y terminal and take that wire and connect it at the R terminal. So, unscrew the Y terminal, take that wire out, unscrew the R terminal, and slip the Y wire in there and tighten it so it will remain connected while you step outside to see if the outdoor unit is running.
Slip the Y wire in there while the R wire remains there.
Ok, leave that wire in place. I want you to go to the outdoor unit, remove the panel on the corner where the wiring goes in, there is typically high voltage present there along with control voltage. There is a device there where you will see your high voltage wires wired into. It is called a contactor. Tell me if that contactor is pulled in or not. Or if it sounds as though it is humming. The screws on the outdoor unit are 5/16"
Does the unit make any noise? I know you said the fan isn't turning, but can you hear the compressor running? I was under the impression that it was just sitting doing nothing other than the indoor unit running.
I do need you to check inside, but I need you to do something differently now. You can rewire your thermostat back as it was and put the thermostat back on the base plate. Then I want you to disconnect high voltage from your unit. SO pull your disconnect or turn off the breaker for the outdoor unit. Then I want you to take that corner panel and inspect the capacitor inside. The capacitor will be a silver cylindrical item with three wiring connections on it. Check for broken or burned wires. Specifically on the C terminal and the fan terminal of it. Also, inspect the form of it, such as the top. It should be relatively flat on the top where the wiring connections are mounted and flat on the bottom. Look for swelling or expansion. Often they will expand out into a dome, which is an indicator that it has shorted out on the inside. If you see anything that looks suspicious but you aren't sure take a photograph of it and send it and I will inspect the photograph for you.
Alright. That is fine. I apologize for the misunderstanding earlier. I will be ready to continue as soon as you are. Thank you.