panasonic cu-re12jkx-1 error h11 ,no communication

[nedst]

Hi ,i have a problem with this unit ,i suspect it is outdoor pcb .Is there some component that could the problem and it is replacable ? The whole pcb is expensive and would be better to buy a new unit .I have checked few resistors and capacitors on the com terminal 3 but couldnt find anything wrong .I hear a lot of this units have this problem .
In one machine like this a had a problem with power module on outdoor pcb and manage to repair it .Maybe someone has a solution?

[nedst]

Found this:
If all connections are good, than measure beteeen them on the DC range, and it should be fluctuating between 20 and 50 V DC

If it is, than it may be a faulty indoor PCB, if it is not, than disconnect number 3 at the outdoor unit, and measure what comes out of the PCB on 3, in reference to number 2,it should be about 20 - 70 Vdc
If this voltage is not there, than the outdoor PCB may be faulty

stefs cruiser posted on this forum, in relation to some other panasonic model .Is this also aplicable to this model?