Daikin EHYHBH05AAV3 Service Manual page 94

Error Codes: Hydro-box
3 Error Codes: Hydro-box
1
“A1” Malfunctioning Hydro-box PCB
3.1
User interface
display
Error generation
3
Supposed causes
4
Troubleshooting
5
Caution
Part 4 – Troubleshooting
A1
The error is generated when the data from the EEPROM is not received correctly.
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.
The possible cause is a malfunctioning hydro-box PCB.
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
94
ESIE13-02A