Mitsubishi heavy industrial A/C.

[Langer]

Hey there...

I dont normaly work on Mitsubishi A/C units, but came across one today with the controller blinking
on and off. It wont do anything. Changed it for another one but the same problem.

Appreciate any information.

[al]

Had one that was being commissioned, nuetral was fed thru an rcd and was tripping, 3 phases were ok but no nuetral, only indication was controller blinking on and off
have you correct voltage at controller??

Al

[Langer]

What voltage is meant to be at it do you know?

There're 3 wires at the controller.

No R.C.D on this system, just an 3 phase M.C.B.

[al]

Twas just the neutral that was fed from the rcd, the whole neutral block had been hooked up that way, not too sure on the voltage but i think it's either 12 or 5vdc?
is the connection at the indoor ok?

al

[Langer]

There are about 14 indoor units, some are working, some aren't. Because half work and half dont is making it a bit of a problem.

[Ian Neill]

Hi Is there any fault codeit would usually start with an E number?

[Langer]

Cant get a code because the controller isnt working for me. Its just blinking on and off.

The outdoor unit isnt showing a code either.
Green light on pcb board is staying on, whick is stand-by.

[Ian Neill]

Hi Can you give me any model numbers gas type etc and I'll have a look in my service data book.

[Langer]

The outdoor unit is; FDC508HES3. (Sorry, dont have indoor Model).

Gas is, R22.

Thanks!

[Ian Neill]

Hi Some more questions

Is this controller conected to 1 or multiple units?

Whats the system history.....has any one messed up the configuration (multiple units) address codes etc , before you looked at it.

If multiple units do all the outdoors show no fault?

Can you get the indoor model nos? As I have details on indoor LED's which could maybe help with fault diagnosis?

You may get more help from MHI technical people at 3D tel 01376565505

Regards
Ian

[Langer]

Thanks for that, Ian!

We might be changing out the units, (so I was told this morning), but if they're staying, I'll give that number a ring.

thanks again!