4210 error mitsu

[philjd26]

hi
tried starting up a vrf system today after fixing a leak.. compressor was giving off a hummming noise, with no sign of pressure change, displayed a 42 10 error after a period of time.....checked voltage to compressor terminalsd and found all evenish, apart from a differentail of 8volts on 1 phase...checked current off each phase..2 x phases had 16amps and 1 phase with the slight differential absorbing nothing....checked windings for ballance etc...all ok, any ideas whats happening????

rgrds phil (bit pissed writing this since were in a recession in all) thanks

[nike123]

hi
tried starting up a vrf system today after fixing a leak.. compressor was giving off a hummming noise, with no sign of pressure change, displayed a 42 10 error after a period of time.....checked voltage to compressor terminalsd and found all evenish, apart from a differentail of 8volts on 1 phase...checked current off each phase..2 x phases had 16amps and 1 phase with the slight differential absorbing nothing....checked windings for ballance etc...all ok, any ideas whats happening????

rgrds phil (bit pissed writing this since were in a recession in all) thanks

Inverter circuit faulty or compressor one phase fault!
Check inverter with inverter checker or 3 light bulbs of corresponding power connected in star.
Check compressor insulation with insulation tester.

[Thermatech]

Could have been compressor warm up function.

outside air on TH6 sensor is less than about 10 deg C when 3ph power up the outdoor control circuit board considers that the compressor must be cold & crankcase heater not had time to warm up compressor & boil off any liquid refrigerant in the compressor shell.
So it goes for comp warm up = lots of amps into the windings but no rotation just lots of humming noise.

4210 = overcurrent.

After warm up mode check power supply to comp with comp disconnected & confirm correct ballanced 3ph output from inverter.

If the system has been running SOG then comp could be damaged.

[philjd26]

thanks for replies, i will take a look in the morning..

rgrds phil