The term, "contactor" is not familiar to me however: Is the contactor contained within the "inside the house" evaporator unit or is it " housed in the "compressor unit" outside the house? I have already presumed that the thermostat sends only signal (low) voltage and certainly does not directly connect the 220 to the compressor unit. Your advice will only have a chance of being helpful if I can identify the contactor and where it is located in the overall system. By the way, I may have failed to mention that separate responsive clicks are heard from the indoor unit when the thermostat calls for cooling and when the fan motor (however erratic) turns on and off.

Thanks

Kenton,

Your getting much better. However, it seems that the condenser unit is working properly which implies that the contactor (relay, in my world, I'm from the old school) is working properly. I can cycle from cooling to "not cooling" and the outside unit seems to respond properly. Please recall that problem seems to be with the evaporator fan motor that either fails to shut off when cooling is no longer called for or, conversley, it responds only to what should be unnecessary changes in the thermostat unit. However, I think I see that the thermostat need only complete the circuit that energizes the coil that snaps in the contactor verifying that no separate "relay" is needed in the indoor unit and we are thus left with the question of the blower motor running all the time. I have to imagine that the indoor unit has a similiar contactor (relay) to furnish the 110 for the blower motor.

By the way, I AM impresed with the video you provided of the contactor. I was not expecting something like this and I confess that you are on top of the problem and I fully believe that we'll get there soon.

Thanks/Charles "Chuck"* Neely

*Chuck as in Chuckwagon! I told somebody I thought I was loosing weight and they responded, "Turn around. . .I think I've found it! . . . . . . ( ! )

Hi, again, Kenton,

Your description of a relay matches my own recollection of when I used to work in commerical radio and, yes, I do have an (old timey!) Simpson 206 meter that could be used to check for on/off continuity of a relay. I was hoping that you could identify appearance and location within the unit of this relay as I have not been able to find it. Incidently, since we started with this joint investigation the pesky thing actually did what it was supposed to do. . .that is, when the cooling turned off the fan motor also turned off and is currently not running. (It may be aware that we are contemplating surgery on it and has elected to behave temporarily!)

Before all of this is over I WILL click the accept button as I am certain that you have more than earned the $9 I agreed to. However, I am hoping that you can be a little more specific about the XE 60 unit in terms of what its component parts actually look like. By the way, I was able to locate the red and yellow wires however where I located them was only their connections to the internal 24 volt transformer and what appeared to be the coil of a relay but the contact points were not visible and the coil was located on the side of metal box that (might) contain the contact points.

I wish that I had a circuit diagram of the electrical system as it might help me located specific hardware involved. If such exists, can you supply or direct me to it?

Sincerely/Chuck

Kenton,

You caught me up short. I don't have a camera that makes computer file type pictures. However, I consider your help so far to be completely acceptable and I'll click the accept button following this message with my thanks.

I have concluded that your advise has correctly identified the problem and that it is the fan motor relay and not the thermostat control unit. I realize that I may be reaching here but my own opinion that, given the two units, the relay or the thermostat control unit, the relay is the more likely villian and I'll take to steps to have it replaced with no further investigation. If I have guessed wrong, I will not blame you.

Cordially/Chuck