Hi all I have a cruisair SMX II system with 3 evaporators (one in each cabin), each controlled using SMXir keypad. All units have electrical heating built in. One of them does not heat and throw the rccb breaker (is it the correct English word ??) after 1-2 minutes of operation, which lets me think of a short circuit of the heater to ground, at least with some resistance which over the time releases the rccb. The question is, can the electric heating unit be repaired or changed inside the EHMB4C? thanks a lot for help!