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Do you have model on the indoor unit? The transformer will have two low voltage wires.One is considered "HOT" and goes to R at thermostat.he other is COMMON.C at thermostat will go to that wire.
Do not rate until we are finished.
Looks like Coldflo has there wiring diagrams and manuals protected.Do you see a wiring diagram you can send a picture of?
Excellent .Thanks for the picture.
As noted, there are 2 low voltage wires coming from transformer. One goes to R at thermostat.The other is your C wire. It will go to C at thermostat and all components (Contactor,fan relay,timer ,etc)
Pic gets a little blurry when I enlarge it. Look closely at the transformer and tell me if you see 24v marked on thermostat label and if so which wires I picture go to the 24v terminals.
I am thinking 24v common is this yellow wire
That should say marked on transformer not thermostat
That should be your 24v common. Do you have a volt meter?
Not sure why it would be going on and off. WE should have constant 24v
If you can get a meter we can try to troubleshoot to see where it may be coming and going and what is breaking the circuit like that
Sounds good.Talk to you tomorrow.
Thanks for letting me work with you.
Excellent. Lets start by going to thermostat and putting one lead on C and one on R and make sure we are losing the 24v after 5 seconds.If so we wlil go back to air handler
I would replace that transformer.It sounds like it is bleeding down under load.Make sure to use at least a 40VA transformer.