Daikin Altherma HT Service Manual

Troubleshooting by Indication on the Remote Controller ESIE09-08B
176 Troubleshooting
3.35 “JC ” Outdoor Unit: Malfunction of Low Pressure Sensor
Remote Control
Display
JC
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection
Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions
When the low pressure sensor is short circuit or open circuit.
Supposed
Causes
 Defect of low pressure sensor
 Connection of high pressure sensor with wrong connection
 Defect of outdoor unit PC board
Troubleshooting
1: Voltage measurement point
2: Refer to “Pressure Sensor”, pressure/voltage characteristics table on P242.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V2808)
Replace the low pressure sensor.
Connect low pressure sensor
property and restart system.
NO
NO
Replace outdoor unit PC board
(A1P).
YES
YES
The low
pressure sensor is
connected to X18A (blue) of
outdoor unit PC board
(A1P).
4
3
2
1
(V2809)
Red
Black
White
GND
*2 Measure voltage here.
Low pressure sensor
Outside unit PC board A1P
+5V
X18A
Microcomputer
A/D input

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++