ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 199
3.30 “JC” Outdoor Unit: Malfunction of Low Pressure Sensor
Remote
Controller
Display
JC
Applicable
Models
ERQ 125 ~ 200 A7V1
Method of
Malfunction
Detection
Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions
When the low pressure sensor is short circuit or open circuit.
Supposed
Causes
Defect of low pressure sensor
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 P234.
(V2808)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The
relationship
between the ∗1
VL and low pressure is
normal (see ∗2) when voltage
is measured between X18A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see ∗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 X18A (blue)
of outdoor unit PC
board (A1P).
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