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

Troubleshooting by Indication on the Remote Controller
3.33 "JA " Outdoor Unit: Malfunction of High Pressure Sensor
JA
Remote Control
Display
ER*Q 011~016*
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 outdoor unit PC board
Troubleshooting
1: Voltage measurement point
2: Refer to "Pressure Sensor", pressure / voltage characteristics table on P242.
174
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 (A1P).
YES
The
relationship
between the *1
VH and high pressure is
normal (see *2) when voltage
YES
is measured between
X17A pins (1) and (3) of
indoor unit PC board
(A1P) (see *1).
NO
Indoor unit PC board A4P
GND
Microcomputer
A/D input
*2 Measure DC voltage here.
Connect the high pressure sensor
and turn on again.
Replace indoor unit PC board
(A1P).
Replace the high pressure sensor.
+5V
X17A
Red
4
Black
3
2
White
1
ESIE09-08B
(V2806)
(V2807)
Troubleshooting