ESIE09-08Troubleshooting by Indication on the Remote ControllerTroubleshooting1313.2“A6”Indoor Unit: Pump Error (M1P) or Other WaterSystem ErrorRemote ControlDisplayA6Subcode 0ApplicableModelsAll indoor unit modelsMethod ofMalfunctionDetectionDetection by failure of signal for detecting number of turns to come from the pump motor.Detection by failure ref. sensors.MalfunctionDecisionConditionsWhen number of turns cannot be detected even when output voltage to the pump motor ismaximum. When water sensors are not within expected range.SupposedCausesPump rotor lockedDisconnected or faulty wiring between pump connector and PC board (A1P)Blocked waterflow or heat exchanger (waterside)TroubleshootingCautionBe sure to turn off power switch before connecting or disconnecting connector,otherwise parts may be damaged.Connect the wiring and turn on again.Fix the wiring and turn on again.YESNONONONONOYESYESReplace the indoor unit PC board.Replace the pump motor.(V2779)Is thewiring from thepump securely connectedto connectors (X20A) on theindoor unit PC board?(A1P)Wiringbetween the indoorunit PC board and pump isdisconnected.Does the pump run?YESCan be checked- Too high T° difference|Return water- R-134a liquid T°|>40°C|Leaving water T° - condense temp|>15°C- Too small T° difference|Leaving water- return water temp|<1°CIs thewaterflow or heatexchangerblocked?YESMake sure all valves are open.Make sure filter is not clogged.Make that sure water pressure is OK(0,3barMake sure that all valves are open.Make sure that all air is out of the system.Is the pumprotor locked?
