Ja" Indoor Unit: Malfunction Of High Pressure Sensor - Daikin ALTHERMA HT Service Manual

ESIE09-08B
3.34 "JA " Indoor Unit: Malfunction of High Pressure Sensor
JA
Remote Control
Display
Subcode 16
All indoor units
Applicable
Models
Malfunction is detected from the pressure detected by the high pressure sensor.
Method of
Malfunction
Detection
When the high pressure sensor is short circuit or open circuit.
Malfunction
Decision
Conditions
 Defect of high pressure sensor
Supposed
 Connection of low pressure sensor with wrong connection
Causes
 Defect of indoor unit PC board (A4P)
Troubleshooting
1: Voltage measurement point
2: Refer to "Pressure Sensor", pressure / voltage characteristics table on P242.
Troubleshooting
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
The high
pressure sensor is
NO
connected to X17A of
indoor unit PC
board (A4P).
YES
YES
NO
Indoor unit PC board A4P
GND
Microcomputer
A/D input
*2 Measure DC voltage here.
Troubleshooting by Indication on the Remote Controller
Bad wire connection
Connect the high pressure sensor
Value < 0.1 bar
and turn on again.
over 60 seconds
Faulty sensor
Replace indoor unit PC board
Value > 43 bar
(A4P).
over 60 seconds
Replace the high pressure sensor.
+5V
X17A
4
3
2
1
(V2806)
Red
Black
White
(V2807)
175