Mitsubishi Mr. Slim MXZ-3B30NA I really need someone to teach this old dog a new trick, Please…
First I checked the outdoor units power supply L-1 has 123 VAC, L-2 has 123 VAC, together they do have 246 VAC. No problem there. Next step I checked CN-601 input, it has 221 VAC. Again no problem. Next CN-611 and CN-621 are supposed to have 12-24 VDC each, they are only showing less than one volt on each (.14 and .28) Then I opened up the inside coil control panel on both inside units to double check, The terminals 1 & 2 are showing 230 VAC but terminals 2 & 3 are only showing less than one volt DC (.24) Both inside fan coil units shut down after approximately six minutes, comp and cond fan never come on. I am really at a loss troubleshooting this unit. All I need is a guiding hand to which I would be very grateful. I have the manuals, schematics, and tools. I just need someone with experience to tell me where to check next or what could possibly be wrong. Test points from the schematic are fine.
Thanks for any input or help.
Woody Ellenton Fl.