Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 149
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.

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++