9-4
Samsung Electronics
Error Mode
CO
2
sensor error (OPEN/SHORT)
Display
Check Method
When CO
2
input pulse maintains High status or Low status for longer than 2 minutes.
Cause
PCB check, CO
2
sensor check or replacement
Sensor SPEC.
Preheating time in case of power supply authorization (2 minutes), Authorized power supply DC12V, 400~2,000PPM
9-4-2 CO
2
Sensor Error(CN43)
Check product
operation.
Yes
Yes
Yes
E139 code appears when unit
operation starts or while it is in operation.
No
Is CO
2
sensor connector (CN43)
of PCB dislocated from PCB?
Assembly the
connector
Yes
No
Is sensor connector CN101
dislocated from the sensor?
Does LED1 of CO
2
sensor
flicker once in 6 seconds?
Is DC12V power measured
from sensor connector
①↔③
?
Is square wave measured
from sensor connector
③↔②
?
PCB check or replacement
Sensor check or
replacement
No
No
No
t$0
2
sensor checks DATA once in six seconds. It waits for 5 seconds and conducts data check for one second.
t$0
2
sensor and LED 1 light up for 1 second when the sensor check DATA.
t$0
2
Sensor checks DATA ranges 400PPM~2,000PPM.
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