Ja" Indoor Unit: Malfunction Of High Pressure Sensor - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

ESIE09-08A
3.34 "JA " Indoor Unit: Malfunction of High Pressure Sensor
JA
Remote Control
Display
Subcode 16
Applicable Models All indoor units
Method of
Malfunction is detected from the pressure detected by the high pressure sensor.
Malfunction
Detection
Malfunction When the high pressure sensor is short circuit or open circuit.
Decision Conditions
 Defect of high pressure sensor
Supposed Causes
 Connection of low pressure sensor with wrong connection
 Defect of indoor unit PC board (A4P)
Troubleshooting
1: Voltage measurement point
2: Refer to "Pressure Sensor", pressure / voltage characteristics table on P254.
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting
Caution
connector, otherwise parts may be damaged
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)
185