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15.2.2 H12 (Indoor Unit Capacity Unmatched)
Malfunction Decision Conditions
Occur when connect in a multi free inverter system.
However, for single split system (ONLY: CS-E21~24DKE; I/D capacity more than 5.0kW), when indoor and
outdoor are disconnected from one another, H12 will appear but with conditions.
Malfunction Caused
Wrong models interconnected.
Wrong indoor unit and outdoor unit PCBs used.
Indoor unit or outdoor unit PCB defective.
Indoor-outdoor signal transmission error due to wrong wiring.
Indoor-outdoor signal transmission error due to breaking of wire 3 in the connection wires between the indoor
and outdoor units.
Abnormality Judgment:
90 seconds after power supply turn ON.
Troubleshooting
Check indoor and outdoor
units model number.
Match the compatible
model.
No
Is the indoor and outdoor
model number matched?
Check the spare part numbers of the
indoor and outdoor unit PCBs and
compare with their Part Lists.
Matched compatibility?
Change for the specified
indoor or outdoor unit PCB.
Yes
No
Yes
Replace the indoor and
outdoor unit PCBs.
Check the indoor-outdoor
units connection wires.
Correct the indoor-outdoor
units connection wires.
Yes
Is there any wiring error?
No
Check the indoor unit
capacity. Is it within the min
– max outdoor limit?
Yes
No
Correct to the allowed
connectible indoor unit
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
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