Technician found mechanical temp controls not accurate. Will need to install new temp control and test operation. Arrived on site to find freezer at 25 degrees F. Recently worked on unit not running. Checked unit and had proper voltage to condenser. Found HPS not sending voltage through. Attempted to reset HPS manual reset. HOS would not reset. Hooked up gauges and bypassed HPS. Powered unit on and it ran. Unit was not hitting 410 PSI at which safety would open. Bad HPS. Went to supply house and picked up mechanical HPS and installed it under warranty. Replaced unit temp control panel n freezer at evaporator. Powered unit on and verified operations.