Service manual

6-7
Alarm code Content Possible cause
E407 Evaporator inlet sensor (EIS) Line breakage
malfunction Short circuit
Wrong wiring
CPU board malfunction
E409 Evaporator outlet sensor Line breakage
(EOS) malfunction Short circuit
Wrong wiring
CPU board malfunction
E411 Ambient sensor (AMBS) Line breakage
malfunction Short circuit
Wrong wiring
CPU board malfunction
E413 Low pressure transducer Line breakage
(LPT) malfunction Short circuit
Wrong wiring
CPU board malfunction
E415 High pressure transducer Line breakage
(HPT) malfunction Short circuit
Wrong wiring
CPU board malfunction
E417 Voltage sensor (PT1) Sensor malfunction
malfunction CPU board malfunction
E419 Voltage sensor (PT2) Sensor malfunction
malfunction CPU board malfunction
E421 Current sensor (CT1) Sensor malfunction
malfunction CPU board malfunction
E423 Current sensor (CT2) Sensor malfunction
malfunction CPU board malfunction
E425 Pulp temperature sensor Wrong wiring in the USDA receptacle.
E427 (USDA1 to 3) malfunction Line breakage in the USDA receptacle.
E429 Short circuit in the USDA receptacle.
Junction cable breakage
Junction cable poor contact
Wrong wiring in the control box
Short circuit in the control box
Pulp temperature sensor malfunction
CPU board malfunction
E431 Humidity sensor (HuS) Lead wire breakage
malfunction Wrong wiring
Humidity sensor malfunction
CPU board malfunction
E603 Line breakage of suction Lead wire breakage
modulating valve (SMV) or Wrong wiring
drive circuit malfunction or CPU board malfunction
wrong setting of controller Wrong setting of initial setting of controller (DECOS a, b, c)
E607 Abnormal contact point of Switch malfunction
manual defrost key Short circuit
(sheet key) CPU board malfunction
E707 Momentally power failure Commercial power supply stops for 40 to 300msec.