Daikin r407c 2 pipe vrv ja fault code any offers?

[Contactor]

Hi

I have a Daikin RSXYP5 with a JA fault. I have checked the thermistors and pressure sensors (transducer voltages) and confirmed with Daikin they're in range, this was at a standing pressure of 7 bar and has not been done with the system running.

I have good pressures in cooling. However, in heating I am reading 11 Bar suction and 18 bar discharge fluctuating slightly. It runs like this for a couple of hours and then pukes up the fault code.

On starting up this morning the pressures were up at 20 Bar+ disharge and 14/15 bar suction with an ambient temperature of 12 deg celsius.

(I also found that the controllers were scrambled with two displaying the master controller symbol and others switching between heating and cooling. I think I may have solved this by switching the pcb to Cool/heat (with system off) and making terminals A and C i.e forced heating mode. I think this is probably unrelated to the JA fault though).

JA = faulty discharge pipe pressure sensor.

Same fault code in cooling after 1 - 2 hours.

System has been in approx five years, serviced regularly and no problems to date.

I am heading back tomorrow to plug the checker in.

Any offers anyone?

Thank you.