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3.6
LL: S1+S2 dialing setting error (for MS04-12)
Digital display output
Description
S1+S2 dialing setting error.
All units stop running.
Error code is displayed on the malfunction MS box.
The indoor unit display board or wired controller connected to this MS displays "F8”.
Trigger / recover condition
Trigger condition: S1 and S2 are set to ON, but the indoor unit is connected to both pipes 1 and 2 (or the indoor unit is
connected to pipes 3 and 4).
Recover condition: Does not meet trigger conditions.
Reset method: Manually restart.
Possible causes
S1+S2 dialing setting error.
Signal cables are incorrectly connected.
MS PCB damaged.
Procedure
LL
S1+S2 dialing setting error.
Yes
Reset dial S1+S2.
No
Signal cable is incorrectly connected
Yes
Check and connect the signal cables
properly.
No
Replace the MS main PCB
