Haier HSU-09RS03/R2(SDB) Service Manual

Also see for HSU-09RS03/R2(SDB): Installation manual Operation manual Operation manual

Haier HSU-09RS03/R2(SDB) Service Manual Manual pdf 55 page image

52Domestic air conditionerHSU-09/12RS03/R2(SDB) Service Diagnosis7 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 MeasuresSymptRm Check Item Details of MeasureNone of the unitsoperatesCheck the power supply. Check to make sure that the rated voltage is supplied.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.Equipmentoperates but doesnot cool, or doesnot heat (only forheat pump)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.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.