mitsubishi electric-inverter multi

[eurocooling]

Hi we went to a job today this place has 6 indoor units all the units are dead there is power going to the two outdoor units and the outdoor boards are fine there is no power on the 6 indoor units check all the indoor pcb boards to see if they were blow on fuses all ok we checked the compressors boards fans all ok can anyone help please these are 6 years old

[install monkey]

mitsi multi splits have upto 2 branch boxes- s1,s2,s3 from outdoor unit powers the branch box and then all internal units come off the branch box, theres also a fuse ref f1
http://www.mediafire.com/view/?3h0ezprn0n909ln
engineering guide
http://www.mediafire.com/view/?qfhyly3kb37ukty
service manual

[Darrenp]

Breakers mcbs for indoors?? Fused spurs ?? Just a thought

[eurocooling]

Check all these there are no branch as you have seperate pipes going to each indoor unit from outside with 4 core cable

[install monkey]

whats the model number? is there power on the outdoor pcb on the terminals to indoor units, break in cable?

[install monkey]

mxz multi's fuse no f65 on noise filter puts 240 v to indoors
test for continuity from main L on outdoor supply and any of the s1 terminals

[eurocooling]

Thanks monkey