Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
154 Troubleshooting
3.17 “E4 ” Indoor Unit: Actuation of Low Pressure Sensor
Remote Control
Display
E4
Subcode 6
Applicable
Models
All indoor units
Method of
Malfunction
Detection
Abnormality is detected by the pressure value with the low pressure sensor.
Malfunction
Decision
Conditions
Error is generated when the low pressure is dropped under specific pressure.
Operating pressure: 0.07MPa
Supposed
Causes
 Abnormal drop of low pressure (Lower than 0.07MPa)
 Defect of low pressure sensor
 Defect control PC board (A4P)
 Stop valve is not opened.
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++