Problem with Mitsubishi Heavy Indusry Unit blowing 3 amp fuse

[kelvin01]

I need help with a MHI FDT508-a unit which keeps blowing a 3.15 A fuse. I know there is dead short somewhere in the system but i have checked every possible piece of equipment in the unit, fan motor, transformer, drain pump, louvre motor, external condensate pump, all outdoor components, and nothing is showing a cause. Can anyone shed any light on this?

[knight rider]

hi
i had a similar problem with a daikin traced the fault to the interconnecting cable , maybe an idea to check this , good luck

[raj]

if the fuse is blown not immediately, then there may be loose connecction or partial disconnection inside the cable in this case you can see the wire gets heated up or drive parts taking high current.

[kelvin01]

Thanks knight rider.

I've tried checking the cable already but only tried the L & N, will check other cores as it is a 5core cable.

Cheers.