Mitsubishi AC systems

[Stretch79]

Hi all,

Just wondered if anyone here could help with the below?

A client has 2 Mitsu systems,

1 x PEAD-RP100JAQ on a PUHZ-P100YHA2 unit
1 x PEAD-M100JA on a PUZ-M100YKA unit

These units where installed a few years apart, so separate supplies.

Both wired up to one wall mounted controller, unit 1 was direct to the controller, then unit 2 is run from unit 1 terminals in parallel, no central controllers etc

Having a E9 fault which is comms., but I want to confirm which one of the two it is. Removed unit 2 and wired solely into unit 1, controller doesn't display, assuming addressing issue?

So addressing these units.

Just go into service menu and it will auto address or is this manual?

Many thanks, hope that makes sense.

[Stretch79]

Please delete post, unsure how, thanks