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I attached the new contactor photo. It has a model No. C240C. Don't know if it helps. It looks totally different. Both sides of the contactor look the same. Which wire should go where?

Thank you

I have Trane XE900 contactor that stuck now and then. It has 3 contacts on each side plus one contact on each side for the transformer. (please see attachment)
The new contactor that I bought has 4...

I have a Trane 900 with heat pump. The outside unit still runs even when I turn thermostat off. I have to shut it off from the breaker. I put in a new Honeywell thermostat and it still does the same...