Si33-105
Troubleshooting
Troubleshooting R407C PLUS Series Heat Recovery System
185
3.29
Malfunction of Transmission Between Outdoor Units
Remote
Controller
Display
U7
Supposed
Causes
!
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
(VF056)
NO
YES
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
YES
NO
C/H SELECT is set to "IND".
Cool / heat selection is
unified.
C/H SELECT
is set to "MASTER".
NO
Is the indoor
/ outdoor unit transmission
wiring normal?
C/H SELECT
is set to "SLAVE".
YES
NO
Check
and see if the following
items are normal.
NO
Does
a malfunction occur when
the cool / heat selector is
set to "IND"?
YES
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.
YES
NO
NO
YES
YES
Replace the outdoor unit
outside control adaptor.
replacement
Replace the outdoor unit PC
board (A1P).
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?
Fix the problem.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Summary of Contents for R407C PLUS
Page 1: ...System R407C PLUS Series Heat Recovery System Si33 105 Service Manual ...
Page 11: ...Introduction Si33 105 x ...
Page 41: ...Specifications Si33 105 30 Specifications R407C PLUS Series Heat Recovery System ...
Page 147: ...Test Operation Si33 105 136 Test Operation R407C PLUS Series Heat Recovery System ...
Page 263: ...Si33 105 iv Index ...