System Down Caused By Communication Error After Tracking - Samsung ERV Operating Instructions Manual

9-4-5 System Down Caused by Communication Error after Tracking

Error Mode Communication error
Display
Check Method MASTER ↔ SLAVE Communication failure continues for 2 minutes after Tracking is completed.
Cause OPTION setup, PCB check or replacement
Sensor SPEC. Communication, F1, F2
No
Check the communication
line of MASTER PCB and
connector, then, replace the PCB.
+0.7V
-0.7V
Samsung Electronics
E202 code appears when unit
operation starts or while it is in operation.
Check display with pressing RESET KEY K3 of
MASTER PCB in order to CHECK number of Slaves
responding to Tracking.
Does Tracking display show
no response at all from any Slave?
Yes
After eliminate communication line
아니오
connecting Master and Slave, check the 2 lines
of Masterwith Scope.
Yes
Is the voltage between the 2 lines
is square wave higher than DC±0.7V as
seen in the picture below?
Yes
Reconnect communication line between Mster
and Slave. Eliminate all communication connectors
on Slave PCB and connect them again one by one.
Find out the Slave interrupting communication
and check its lines. Then, replace Slave PCB.
Good
No
Check whether PCB address setup
is overlapped or not after having found
out SLAVE reporting error about
2 minutes later. (If PCB address setup
is overlapped, communication error
may occur.) In this case, both Slaves
with wrong address setup suffer from
communication error.
If there is nothing wrong with address.
Check communication line and replace
Slave PCB.
Bad
9-7