Daikin VRV RXYQ72-384XAYCA, Service Manual

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Troubleshooting by Error Code SiUS342004EB
253 Part 6 Service Diagnosis
3.18 Self-Cleaning Decoration Panel Abnormality
Applicable
Models
FXFQ-AA (when self-cleaning decoration panel BYCQ54EEGFU is installed)
FXFQ-T (when self-cleaning decoration panel BYCQ125BGW1 is installed)
Error Code
AH
Method of Error
Detection
Error is detected by abnormal signal from the self-cleaning decoration panel.
Error Decision
Conditions
Any of the following conditions is met while the unit is in operation.

There is a transmission error between self-cleaning decoration panel and indoor unit.

Dust detection sensor (light receiving side) is short-circuited.

The total of fan operation time exceeds a specified value after dust collection sign display.

Limit switch does not detect when air filter rotates or air filter does not rotate.

Limit switch does not detect when damper opens (or closes) or damper does not work.

Filter auto clean operation does not complete even after a specified time has elapsed.

Filter auto clean operation does not start even after a specified time has elapsed.
Supposed
Causes

Transmission error (between self-cleaning decoration panel and indoor unit)

Dust detection sensor error

Dust collection sign

Air filter rotation error

Damper rotation error

Filter auto clean operation error

Filter auto clean operation start disabled error