A quick visual explained why the fuses were blowing... Crankcase heater also took out the relay controlling it and a portion of a compressor contactor. If they don't appear visually, a megger works great at finding them when they're intermittent. Sealed Unit Parts Co., Inc. #hvac #hvacservice #hvactroubleshooting #hvacsystem #hvacbusiness #hvacaf #realhvacreallife #hvactools | HVAC Know It All