SiBE121123_A Check
Service Diagnosis 216
8.13 Outdoor Unit Fan System Check
Check No.19 DC motor
8.14 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 kΩ, short circuit occurs on the main circuit.
The illustration is for 50 class model as representative.
(R15128)
YES
YES
NO
NO
Check the outdoor unit fan system.
Outdoor unit fan running?
Outdoor unit fan system
functioning.
Go to Check No. 16.
Reconnect the connector.
Fan motor lead wire
connector disconnected?
(–) 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 is OK.
several k
Ω
~ several M
Ω
∞∞
several k
Ω
~ several M
Ω
Resistance is NG. 0
Ω
or
∞
000
Ω
or
∞
(R12511)
Tester
–~~+
1
2
3
4
–
+
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