Unit was off for code 15, dc bus undervoltage. Contacted tech support, incoming voltage was 252-254, was told that voltage is high, not allowing inverter to turn on compressor. After powering down and powering back on, was able to get unit to start. Allowed unit to run, checked pressure, and amps, ok at this time. Power company needs to be contacted per tech support due to incoming voltage to unit, and unit’s allowable voltage.