daikin vrv II not heating

[mikebee]

all sensor readings fine, eev ok 3 way reversing valv ok, removed gas right charge ok, suction 2bar discharge 9bar ambient 8 deg.

any suggestions

[install monkey]

vrv2 r410a 2 bar suction 9 discharge-short of gas! factory charge plus additional charge = system charge. measure the piperun and confirm the correct additonal charge. usually 7 bar suction,25+ discharge.-are the valves open on the condenser?

[VRVIII]

all sensor readings fine, eev ok 3 way reversing valv ok, removed gas right charge ok, suction 2bar discharge 9bar ambient 8 deg.

any suggestions

Is the unit a heat pump 2 pipe or heat recovery 3 pipe?
Do you have the same symptons when operating in heating & cooling mode?
How did you verify the EEV's are ok?

If the unit is a heat recovery and the problem only occurs in heating/heat recovery mode check the liquid line solenoid valve (Y6S) is energised.

[Mabe]

Check the EEV's in Outdoor unit and then i mean the main eev and the one for the subcool, the M series have troubles with it.
If the main is closed you can have low pressure, chech the top of the expansion valve's for visual damage the can have scratches.