Troubleshooting Si33-105
180 Troubleshooting R407C PLUS Series Heat Recovery System
3.24 Outdoor Unit: Malfunction of Low Pressure Sensor
Remote
Controller
Display
JC
Supposed
Causes
!
Defect of low pressure sensor system
!
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 P243.
(VF050)
The
relationship
between the
H
1
VH and low pressure is
normal (see
H
2) when voltage
is measured between X21A
pins (2) and (3) of outdoor
unit PC board (A1P)
(see
H
1).
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 X21A (blue)
of outdoor unit PC
board (A1P).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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