Service manual

SiBE12-816_D Check
Service Diagnosis 270
8.12 Outdoor Unit Fan System Check
Check No.19 DC motor
8.13 Main Circuit Short Check
Check No.20
Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.

Measure the resistance between the pins of the DB1 as below.

If the resistance is
∞
or less than 1 k
Ω
, short circuit occurs on the main circuit.
★
The illustration is for 50 class model as representative.
(R7159)
YES
YES
NO
NO
Outdoor unit fan system
functioning.
Check the outdoor unit fan system.
Go to Check No. 15.
Outdoor unit fan running?
Fan motor
lead wire connector
disconnected?
Reconnect the connector.
(–) terminal of the tester
(in case of digital,
(+) terminal)
~
(2, 3)
+
(4)
~
(2, 3)
–
(1)
(+) terminal of the tester
(in case of digital,
(–) terminal)
+
(4)
~
(2, 3)
–
(1)
~
(2, 3)
Resistance in OK
several kΩ
~ several MΩ
∞∞
several kΩ
~ several MΩ
Resistance in NG 0 Ω or
∞
000 Ω or
∞
(R12511)
Tester
–~~+
1
2
3
4
–
+