I need some help on a RTHA 255.
The unit is triping on BF0 - transition fault. The control goes to A72 (start), the oil resistance contactor goes off, but no signal off compressor start contactors being energized. The control have a pilot contactor and dosent go on in the start. The machine have a oil flowswitch. Already check that flowswitch is open and auxiliary contacts on the run contator are also open.
All measures i made appointed to the micromodule relay output supply, but i already changed it and the chiller continues to trip on BF0 even without starting the compressor.
I appreciate any help.