Daikin VRV X RXQ6-48ANR Series, Service Manual, Page: 181 / 297

SiME341909EA Troubleshooting by Error Code
Part 6 Service Diagnosis 175
5.11 Auto Grille Unit Error
Applicable
Models
FXFSQ-AR (when auto grille panel BYCQ125EASF is installed)
Error Code
AH-12
Method of Error
Detection
This error is determined when an abnormal signal from the auto grille kit is detected.
Error Decision
Conditions
Any of the following conditions is established while the grille is elevating.
 The storage detection limit switch does not detect anything for a prescribed time while the
grille is moving upward.
 The position detection limit switch does not detect anything for a prescribed time while the
grille is moving upward.
 The position detection limit switch detects a position for less than one second while the grille
is moving downward.
Supposed
Causes
 A large load on the grille

Tangled wire
 Defective motor
 Defective limit switch
Troubleshooting
Check the limit switch, gear,
motor of the drive unit.
Check the items below.
• The grille is elevating while
tilted in a horizontal direction.
• The grille is caught by
something.
• The grille is not mounted.
After correcting any of the
items above, perform
elevating operation again.
YES
YES
NO
NO
Eliminate the load on the grille.
Perform elevating operation
again.
Is there any
abnormality on appearance of
the grille?
A large load
is applied to the grille.
NO
YES
Correct the winding of wire. A wire is tangled.
YES
Normal.
Is the drive unit normal?
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.