Samsung ERV RHF025EE Service Manual page 110

Troubleshooting
12-4-2 CO Sensor Error(CN43)
2
Error Mode CO
Display
Check Method When CO
Cause
PCB check, CO
Sensor SPEC.
Preheating time in case of power supply authorization (2 minutes), Authorized power supply DC12V, 400~2,000PPM
No
No
Sensor check or
replacement
• CO sensor checks DATA once in six seconds. It waits for 5 seconds and conducts data check for one second.
2
• CO sensor and LED 1 light up for 1 second when the sensor check DATA.
2
• CO Sensor checks DATA ranges 400PPM~2,000PPM.
2
• The process requires 2 second of preheating, during which, DATA can changes.
12-4
sensor error (OPEN/SHORT)
2
input pulse maintains High status or Low status for longer than 2 minutes.
2
sensor check or replacement
2
E139 code appears when unit
operation starts or while it is in operation.
Is CO sensor connector (CN43)
2
of PCB dislocated from PCB?
Is sensor connector CN101
dislocated from the sensor?
Does LED1 of CO
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
No
No
sensor
2
Yes
Yes
Yes
Yes
Assembly the
connector
Check product
operation.
No
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