“A1” Hydro-Box Pcb Abnormality - Daikin Altherma EKHBH Series Service Manual

Error Codes: Hydro-box
"A1" Hydro-box PCB Abnormality
2.2
1
Error code
Method of
malfunction
detection
Malfunction
decision conditions
3 3
Supposed causes
Troubleshooting
4
5
Caution
3–8
A1
Evaluation of zero-cross detection of power supply by hydro-box.
When there is no zero-cross detection in approximately 10 continuous seconds.
Faulty hydro-box PCB
Faulty connector connection
Connector connection check
(note).
Is it normal?
YES
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
NO
ESIE06-03
Correct connections.
Replace PCBs.
Part 3 – Troubleshooting