Panasonic CS-PW18GKE Service Manual

Contents

4014.2. Relationship Between The Condition Of The Air Conditioner AndPressure And Electric Current• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.14.3. Diagnosis Methods Of A Malfunction Of A Compressor And 4-way ValveCooling Mode Heating ModeCondition of theair conditoner Low Pressure High Pressure Electric currentduring operationLow Pressure High Pressure Electric currentduring operationInsufficient refrigerant(gas leakage)Clogged capillary tube orStrainerShort circuit in the indoorunitHeat radiation deficiency ofthe outdoor unitInefficient compressionNature of fault Symptom• Electric current during operation becomes approximately 20% lower than the normal value.Insufficient compressing of a compressor • The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).• The difference between high pressure and low pressure becomes almost zero.Locked compressor• Electric current reaches a high level abnormally, and the value exceeds the limit of anammeter. In some cases, a breaker turns off.• The compressor has a humming sound.Insufficient switches of the 4-way valve• Electric current during operation becomes approximately 80% lower than the normal value.• The temperature different between from the discharge tube to the 4-way valve and fromsuction tube to the 4-way valve becomes almost zero.