Samsung ERV - CO2 Sensor Error(CN43)

9-4 Samsung Electronics
Error Mode CO2 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 CO2 Sensor Error(CN43)
Check product
operation.
Yes
Yes
Yes
E139 code appears when unit
operation starts or while it is in operation.
No
Is CO2 sensor connector (CN43)
of PCB dislocated from PCB?
Assembly the
connector
Yes
No
Is sensor connector CN101
dislocated from the sensor?
Does LED1 of CO2 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$02 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$02 Sensor checks DATA ranges 400PPM~2,000PPM.
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