daikin ry140kuy1 ducted LP fault

[paul_h]

I've got a ducted daikin here that isn't running right.
On heat mode, the fans aren't working properly, causing flood back and LP faults.
The compressor starts and runs for 3 min while the fans don't run at all. SP is 100kPa, HP is 1500kPa, suction line full of liquid
Then after 3min the outdoor fans run on low speed for a minute then the system cuts out. both fans do the same thing, either both don't run, or both start up on low speed after a few mintues of compressor operation.

Fan capacitors are OK. Fan motor windings for one is red-black(110 ohms), R-blue (150 ohm) R - orange (375 ohm). Black - blue (41 ohm) BK - orange (264 ohm) Blue - orange (223 ohm).
The other motor in the same order is (95 ohm), (130 ohm), (325 ohm), (36 ohm), (231 ohm), (195 ohm).

The coils on the relay mounted PCB are all OK and 360 ohm. No power from the PCB to the fan motors when they aren't running.

The indoor thermistors are both 25k ohm at ~20C, indoor unit FDYM06FAV1

Anyone come across a similar problem? This system is a few years old and has worked fine for a while.

edit: No fault indicated either, green LED is flashing normally and both red LEDs are off.