I recently bought a used Carrier X2 2100a unit. It cools good and works as I would expect in cycle mode, but when set to continuous, the RPM goes up and down and up and down and up and down… drives me nuts. Do they all do that or is there something wrong with this one?

Additionally, when it goes in to defrost, it’s almost as if the motor wants to die, the RPM’s drop so low. The fuel filter is new and it’s getting plenty of fuel. I’m at a loss.



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