Error code
24 Unit-number connection fault
Applies to 3 models
ASEH09KHCBN, ASEH12KHCBN, ASEH14KHCBN
What this means
The indoor or branch unit number connection is faulty on applicable multi-split systems.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.
See the official Fujitsu manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.