Samsung RHF025EE Service Manual page 69

9-4-6 Wired Remote Control Communication Error
Error Mode Communication error
Display
Check Method Communication between wired remote control and ventilator continues to fail for longer than two minutes.
Cause OPTION setup, PCB check or replacement
Sensor SPEC. Communication F3, F4
E601 code appears when unit operation
starts or while it is in operation.
Start retracking with pressing both Wind Strength
Control Button and Operation Selection Button of
Wired Remote Control simultaneously for 5 seconds.
Check the correct connection of SUB PBA.
Number of ventilators connected
at the time of tracking is indicated?
Eliminate communication line between
Wired Cemote Control and Ventilator. Measure
2 lines of Wired Remote Control with SCOPE.
Is voltage of the 2 lines square wave of over
DC±0.7V as seen in the picture below?
Reconnect communication line between wired
remote control and ventilator. Eliminate all
communication connectors on PCB and connect
them again one by one. Find out the ventilator
interrupting communication and check its lines.
+0.7V
-0.7V
9-8
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Yes
No
아니오
Yes
Then, replace PCB.
Good
No
SUB PBA Reassembly.
Yes
Check number of ventilators
connected at the time of tracking.
Check the first SEGMENT of PCB display
of ventilators connected with wired
remote control, in order to find out
"U" flickers.
Check communication line and
connector of ventilator of
which "U" does not flicker.
Then replace PCB.
No
Check wired remote control
PCB communication line and
connector and replace PCB.
Bad
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