Malfunction Of Transmission Between Outdoor Units - Daikin VRV R-407C PLUS Series Service Manual

SiE 00-07

3.29 Malfunction of Transmission Between Outdoor Units

U7
Remote Controller
Display
Supposed Causes
Troubleshooting
Troubleshooting R-407C PLUS Series
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
C/H SELECT is set to "IND".
NO
Cool / heat selection is unified.
YES
C/H SELECT
is set to "MASTER."
NO
C/H SELECT
is set to "SLAVE."
NO
Is the indoor
YES
/ outdoor unit transmission
wiring normal?
YES
NO
YES
Check
YES
and see if the following items
are normal.
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?"
YES
Troubleshooting
NO
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
Set C/H SELECT to "IND."
The cool / heat unified address for
outdoor units in outdoor - outdoor
unit transmission is duplicated.
Set the address correctly.
NO
Fix the problem.
NO
Replace the outdoor unit outside
control adaptor. replacement
Replace the outdoor unit PC
board (A1P).
(VF056)
151