Daikin ALTHERMA HT ERSQ 011 AA - E3 Indoor Unit: Actuation of High Pressure Switch

ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 159
3.15 “E3 ” Indoor Unit: Actuation of High Pressure Switch
Remote Control
Display
E3
Subcode 12
Applicable Models All indoor units
Method of
Malfunction
Detection
Abnormality is detected when the contact of the high pressure protection switch opens.
Malfunction
Decision Conditions
Error is generated when the HPS activation count reaches the number specific to the operation mode.
(Reference) Operating pressure of high pressure switch
Operating pressure: 3.8MPa
Reset pressure: 2.7MPa
Supposed Causes  Actuation of indoor unit high pressure switch
 Defect of High pressure switch
 Defect of Indoor unit PC board (A4P)
 Faulty high pressure sensor
 Refrigerant blockage
 Water blockage
 Thermal cut out error (Q2L)
Warning: CAPACITOR SHOCK HAZARD. The capacitors (top surfaces) can hold up to 220V. Use
correct precautions when servicing.