Only warm air is getting blown into cabin.

Compressor is working, pipes are cold.

I'm thinking faulty blend door actuator? But the actuator responds to circulate air/fresh from outside button, and defrost (I read this is also controlled by the actuator but I'm not 100% sure I saw the actuator do anything, but defrost works). AMB Temp sensor is working. Fault code says B1283 Air mix actuator (potentiometer) circuit short (body ground)
(an extremely overpriced) shop said a faulty actuator, (so overpriced I'm trying to figure this out myself), I could easily replace that but I need to be more sure the actuator is at fault instead of wires. I can't do anything about the wires.

Can the blend door actuator be only partially broken, that it works for circulate/fresh but won't change the position of the flap that decides how hot/cold the air coming in is?