Samsung ERV RHF025EE Service Manual page 115

12-4-7 Communication Error at DUAL MASTER Setup
Error Mode Communication error
Display
Check Method If more than two MASTERs are set.
Cause
OPTION setup, PCB check or replacement
Sensor SPEC.
E652 code appears when unit operation
Check K8 of SW05 of PCB option setup switch.
Set option switch again with pressing
RESET KEY K3 of MASTER PCB for re-tracking.
Samsung Electronics
starts or while it is in operation.
Is MASTER/SLAVE set properly?
Yes
No
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.
Replace MASTER PCB if tracking is
not conducted.
Troubleshooting
12-9