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Does float switch work?
Does drain pump work?
Is circuit wiring normal?
Is power of
drain pump turned on? ∗
Are connector pins 1 and 2
at drain pump unit side shorted
(Resistance value 0)?
Is connection of
float switch connector
(Indoor control board CN34)
normal?
Check the drain pipe, etc.
Replace drain pump.
Check wiring.
Replace drain pump
and indoor P.C. board
(MCC-1631).
Correct connection
of connector.
Check indoor P.C. board
(MCC-1631).
Defect → Replace
Check and correct wiring
and wire circuit.
YES
YES
YES
YES
YES
YES
NO NO
NO
NO
NO
NO
Is connection of TAsensor connector
(indoor P.C. board CN104) nornal?
Connect connector
of connector.
Check indoor P.C. board (MCC-1631).
Defective → Replace
Are characteristics of TA sensor resistance value normal? Replace TA sensor.
NO
YES
∗ Refer to Characteristics-1.
YES
NO
[P10 error]
∗ Check that voltage of 1 – 2 pin of CN504 on the indoor P.C. board is Approx., 12V.
[F10 error]