Jc" Outdoor Unit: Malfunction Of Low Pressure Sensor - Daikin ERQ Service Manual

ESIE09-05
JC
3.30 " " Outdoor Unit: Malfunction of Low Pressure Sensor
JC
Remote
Controller
Display
Applicable
ERQ 125 ~ 200 A7V1
Models
Method of Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Detection
Malfunction
When the low 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 P234.
Troubleshooting
Defect of low pressure sensor
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PC board.
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The low
pressure sensor is
NO
connected to X18A (blue)
of outdoor unit PC
board (A1P).
YES
The
relationship
between the ∗1
VL and low pressure is
YES
normal (see ∗2) when voltage
is measured between X18A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see ∗1).
NO
Troubleshooting by Indication on the Remote Controller
Connect low pressure sensor
property and restart system.
Replace outdoor unit PC board
(A1P).
Replace the low pressure sensor.
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