Klimaire KSIN Series Service Manual - Manual (Page 55)

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9.2.5 Open circuit or short circuit of temperature sensor diagnosis and
solution(E4/E5/F1/F2/F3)
Check the connections
between temperature
sensor and main PCB.
Are the connections
good?
Correct the connections. No
Yes
Yes
Replace indoor or outdoor main
PCB.
Replace the sensor and
check if the problem
happen again?
Check the resistance value
of the sensor via table1
and table 2, is it normal?
No