The Inverter Phase Check can pinpoint precisely, simply, and quickly whether the compressor or the inverter is faulty. When using the module, the supply connections are disconnected from the compressor, and positively connected to the module. With the unit placed safely hands-free and the inverter switched on, the six lights on the module should light up red, yellow, and blue. If the inverter PCB is faulty, one or more of these lights will not switch on, and this indicates the position of the fault. If all six lights are on, the PCB is fine, and the fault is with the compressor. If they are not all on, or one light is significantly dimmer than the rest, then the fault is with one or more of the output transistors on the PCB, or with the drive circuitry.

EDC International, 315 Riggs St., Unit 1A, Oxford, CT 06478; 888-883-5332;

eProduct 186