Daikin RZQ100B8V3B Service Manual page 225

ESIE05-03
3.13 Malfunction of Suction Pipe Pressure Sensor (JC)
JC
Remote Controller
Display
Method of Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Detection
Malfunction When the suction pipe pressure sensor is short circuit or open circuit.
Decision
Conditions
Supposed Causes
Troubleshooting
*1 : Voltage measurement point
∗2: Refer to pressure sensor, pressure/voltage characteristics table on page
Part 3 – Troubleshooting
Defect of low pressure sensor system
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PC board.
The low
pressure sensor is
connected to X64A (blue) of
outdoor unit PC board
(A1P).
YES
The
relationship
between the *1
VH and low pressure
isnormal (see *2) when
voltage is measured between
X64A pins (2) and
(3) of outdoor unit
PC board (A1P)
(see *1).
NO
Outdoor unit PC board A2P
GND
Microcomputer
A/D input
∗2 Measure voltage here.
NO
YES
+5V
Error Codes: Outdoor Units
Connect low pressure sensor
properly and restart system.
Replace outdoor unit PC board A1P.
Replace the low pressure sensor.
X64A
Red
4
Black
3
White
2
1
(V2809)
3–115 .
1
3 3
4
5
3–77