For some reason my P4 is not controlling my heaters through the powerbar 6e

The heaters are plugged into sockets 5 and 6

Functions are set to Temperature 1 and Heater respectively

State has a green light
Comm light is amber
P5 and P6 are blue

If I unplug the PAB cable then the P4 has a red warning saying communication is lost

It says "ALARMPABCOM"

So it must be communicating when plugged in.

Do you need a screenshot of anything?

I can't find any info anywhere on the powerbar 6e. I don't even know if the LEDs on the front of the unit change colour.

Does anything need resetting or updating?
Please help