Hi guys, just got a call from a guy at work, who is on call tonight. He got called to a restaurant with 4 indoor sanyo cassettes and one multi out door. The problem is the controller is flashing E04 ( comms error?) problem is im trying to guide him through what to do from here. Iv told him to check the basics i.e power to the outdoor, voltage of the outdoor PCB any blown fuses etc. Are there any sanyo experts around to help as the technical number for sanyo is closed until monday