Troubleshooting For Msp Duct Type Indoor Unit; Indoor Unit Pcb Abnormality - Daikin MKS-T Series Service Manual

Troubleshooting for MSP Duct Type Indoor Unit

6. Troubleshooting for MSP Duct Type Indoor Unit

6.1

Indoor Unit PCB Abnormality

A1
Error Code
Method of Error
The system checks the data from EEPROM.
Detection
Error Decision
When the data from the EEPROM is not received correctly
Conditions
EEPROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds
its content without power. It can be erased, either within the computer or externally and usually
requires more voltage for erasure than the common +5 volts used in logic circuits. It functions
like non-volatile RAM, but writing to EEPROM is slower than writing to RAM.
Supposed
 Defective indoor unit PCB
Causes  External factor (noise etc.)
Troubleshooting
127
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Normal?
YES
NO
SiSG121917E
Replace the indoor unit PCB
(control PCB).
External factor other than malfunction
(for example, noise etc.)
Part 6 Service Diagnosis
(R22247)