agree - sounds like a lost leg. the six point check bigwheel refers to is checked as follows -
L1 - L2
L1 - L3
L2 - L3
L1 - grnd
L2 - grnd
L3 - grnd
this is the only way to safely work around 3 phase power. all these measurements should read 0 volts when power is turned off.
you will discover which leg is out when you do your checks. if a leg is out, it will be a transformer or fuse problem on the pole. make sure you are checking the line side of fuses in the unit.
by the way, the 220 could be a low 230 or a high 208. in other words, the power supply transformer could be 208 volts nominal. one more thing - when you read each pole to ground on three phase, you usually will see a higher reading on one of the legs, generally referred to as the 'high leg', due to the centertap of the transformer.
any three phase motors trying to run on 2 hot legs will stall and heat up. this is referred to as 'single-phasing'. if the control transformer is on the leg that's out, the motor controls will be disabled.