Daikin Altherma HT Service Manual

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 165
3.24 “F3 ” Indoor Unit: Abnormal Discharge Pipe Temperature
Remote Control
Display
F3
Subcode 19
Applicable
Models
All indoor units
Method of
Malfunction
Detection
Abnormality is detected according to the temperature detected by the discharge pipe
temperature sensor.
Malfunction
Decision
Conditions
When the discharge pipe temperature rises to an abnormally high level
When the discharge pipe temperature rises suddenly
Supposed
Causes
 Faulty discharge pipe temperature sensor (R6T)
 Faulty connection of discharge pipe temperature sensor
 Faulty indoor unit PC board
Troubleshooting
 Refer to “Thermistor Resistance / Temperature Characteristics” table on page 239.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Discharge
pipe temperature is
120C or higher when the
unit stop by
malfunction
.
Pull out the discharge pipe
thermistor (X12A [1,2] on A4P)
from the indoor PC board, and
then make measurement of
resistance using a multiple meter.
Replace indoor unit PC board
(A4P).
Replace the discharge pipe
thermistor (R6T).
NO
NO
Refrigerant shortage, compression
defect, etc. Defect of the
refrigerant system.
YES
YES

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++