Daikin FTKS50BVMB, Service Manual

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Troubleshooting for Outdoor Unit SiEN18-622
376 Troubleshooting
7.15 Malfunction of High Pressure Sensor
Remote Control
Display
JA
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection Malfunction is detected from the pressure detected by the high pressure sensor.
Malfunction
Decision
Conditions When the high pressure sensor is short circuit or open circuit.
Supposed
Causes „ Defect of high pressure sensor
„ Connection of low pressure sensor with wrong connection.
„
Defect of outdoor unit PCB.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to “Pressure Sensor”, pressure / voltage characteristics table on P409.
(V2 8 06)
Caution
NO
NO
YE S
YE S
Be su re to t u rn off power s witch b efore connect or di s connect connector,
or p a rt s d a m a ge m a y b e occ u rred.
The high
pre ssu re s en s or i s
connected to X17A of
o u tdoor u nit PC
b o a rd (A1P).
The
rel a tion s hip
b etween the * 1
VH a nd high pre ssu re
i s norm a l ( s ee * 2) when
volt a ge i s me au red
b etween X17A pin s (1)
a nd ( 3 ) of o u tdoor
u nit PC b o a rd
(A1P)
( s ee * 1).
Connect the high pre ssu re
s en s or a nd t u rn on a g a in.
Repl a ce o u tdoor u nit PC
b o a rd (A1P).
Repl a ce the high pre ssu re
s en s or.
O u tdoor u nit PC b o a rd A1P
* 2 Me asu re DC volt a ge here.
+5V
X17A
Red
Bl a ck
White
GND
Microcomp u ter
A/D inp u t
High pre
ssu
re
s
en
s
or