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SiE 00-07
Troubleshooting
3.29 Malfunction of Transmission Between Outdoor Units
Remote Controller
Display
Supposed Causes
U7
Improper connection of transmission wiring between outdoor unit and outdoor unit outside control
adaptor
Improper cool/heat selection
Improper cool/heat unified address (outdoor unit, external control adaptor for outdoor unit)
Defect of outdoor unit PC board (A1P)
Defect of outdoor unit outside control adaptor
Troubleshooting
C/H SELECT is set to "IND".
YES
NO
Cool / heat selection is unified.
Is the indoor
/ outdoor unit transmission
wiring normal?
NO
YES
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
NO
Set C/H SELECT to "IND."
YES
C/H SELECT
is set to "MASTER."
YES
The cool / heat unified address for
outdoor units in outdoor - outdoor
unit transmission is duplicated.
Set the address correctly.
NO
C/H SELECT
is set to "SLAVE."
YES
Check
and see if the following items
are normal.
NO
Fix the problem.
NO
Outdoor unit outside control adaptor
•Is there continuity?
•Does the cool/heat unified address match?
Outdoor unit (unified master unit)
•Is there continuity?
•Does the cool/heat unified address match?
YES
Does
a malfunction occur when
the cool / heat selector is set
to "IND?"
NO
Replace the outdoor unit outside
control adaptor. replacement
YES
Replace the outdoor unit PC
board (A1P).
(VF056)
Troubleshooting R-407C PLUS Series
151