You are correct about the defrost mode, but the tech said that in defrost mode a valve opens a full 100% and inside air is recirculated.

With the control unit, when choosing the other options, a valve does not open the full 100% , but some value less, and air from the outside is utilized. Something like that.

Therefore, heat in the defrost mode is very warm, but heat in the other modes are just ok warm. It apprears that the control is working, just not flow in the core.


Thanks.