– 69 –
Red
White
Terminal block
S5277G
Tester
3
2
1
Terminal block at indoor side
S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)
11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)
(1) Outdoor unit does not operate
1) Is the voltage between
and
of the indoor terminal block varied?
Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow-
ing diagram.
NOTE:
• Measurement should be performed 2 minutes and 30 seconds after starting of the operation.
• Be sure to prepare a diode for judgment.
Normal time : Voltage swings between DC15 and 60V. ..................Inverter Assembly check
Abnormal time : Voltage does not vary.
(2) Overflow detection error [Ob error]
Correct connection of connector.
Check drain pipe, etc.
Check and correct cabling/wiring.
Check indoor P.C. board (MCC-5056).
Defect
®
Replace
Check indoor P.C. board (MCC-5056).
Defect
®
Replace
Replace drain pump.
Check cabling.
NO
NONO
NONO
YES
YES
YES
YES
YES
Is connection of float switch connector
(Indoor control P.C. board CN34) normal?
Does float switch
operate?
Is circuit
cabling normal?
Does drain pump
operate?
Is power of drain
pump turned on?
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