So I sent a tech out today to look at an ice rink machine we installed a while back. one compressor was apparently frosted up all the way to the discharge valve. recip machine, electronic expansion valve on each circuit. machine has worked very well since the day it was started, but today, my guy finds the suction sensor about twenty degrees out of calibration, so system was running very low superheat. so my question is this...he calibrated the sensor to the board, but will this be a permanent fix, or will problems come back? is it time to replace the sensor? Thoughts? its the sporlan board, with the remoote keyboard display, dont know the numbers.