Flow Chart For Troubleshooting; Actuation Of High Pressure Switch - Daikin LRMEQ3BY1 Service Manual

Troubleshooting
7.6

Flow Chart for Troubleshooting

7.6.1 Actuation of High Pressure Switch

E3
Error Code
LRMEQ3~4BY1
Applicable
Models
Abnormality is detected when the contact of the high pressure protection switch opens.
Method of Error
Detection
Error is generated when the HPS activation count reaches the number specific to the operation
Error Decision
mode.
Conditions
(Reference) Operating pressure of high pressure switch
Operating pressure: 4.0MPa
Reset pressure:
 Actuation of outdoor unit high pressure switch
Supposed
 Defective high pressure switch
Causes
 Defective outdoor unit main PCB (A1P)
 Instantaneous power failure
 Defective high pressure sensor
 Defective outdoor unit inverter PCB (A2P)
 Air shortage
 Fan motor defective
 Heat exchanger clogged
 Refrigerant overcharge
 Foreign gases
 A stopvalve of the outdoor unit is left closed
72
3.0MPa
Air Cooled Refrigeration Condensing Unit
ESIE17-20A