Haier HSU-18LEK03/R2 Service Manual

Service Diagnosis45 Domestic Air Conditioner7.Service Diagnosis7.1 Caution for DiagnosisThe operation lamp flashes when any of the following errors is detected.1.When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions,disabling equipment operation.2.When a signal transmission error occurs between the indoor and outdoor units.In either case, conduct thediagnostic procedure described in the following pages.7.2.Problem Symptoms and MeasuresSymptom Check Item Details of MeasureCheck the power supply. Check to make sure that the rated voltage is supplied.None of the unitsoperates Check the indoor PCB Check to make sure that the indoor PCB is brokenOperationsometimes stops.Check the power supply. A power failure of 2 to 10 cycles can stop air conditioneroperation.Check for faulty operationof the electronicexpansion valve.Set the units to cooling operation, and compare thetemperatures of the liquid side connection pipes of theconnection section among rooms to check the opening andclosing operation of the electronic expansion valves of theindividual units.Equipmentoperates but doesnot cool, or doesnot heat (only forheat pump)Diagnosis by service portpressure and operatingcurrent.Check for insufficient gas.Large operatingnoise andvibrationsCheck the installationcondition. Check to make sure that the required spaces forinstallation (specified in the Technical Guide, etc.) areprovided.7.4.Error Codes and Description indoor displayCode indicationIndoordisplayingpanel codeindicationOutdoor(LED1 flashtimes)fault description ReferencePageIndoor andOutdoor E7 15 Communication fault between indoor andoutdoor units Page .62E1 -- Room temperature sensor failure Page .50E2 -- Heat-exchange sensor failure Page .5015.egaProrreMORPEEroodnI--4EIndoor MalfunctionE14 -- Indoor fan motor malfunction Page .5215.egaProrreMORPEEroodtuO121FF1 2 45.egaPMPIfonoitcetorpehT