Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 767

10-4. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is put on>
Error Code Meaning of error code and detection method
Reverse phase detection, Power supply
and indoor/outdoor unit connecting wire
converse connection
1. Three seconds after power on, judge
F1
reverse phase by detecting voltage
(4103)
phase of each phase.
2. Abnormal four minutes after power on if
power supply and indoor/outdoor unit
connecting wire have converse connection.
L3-phased open phase detection
F2
Detect open phase two seconds after
(4102)
power on.
Reverse phase detector circuit
(controller board) fault
F7
Abnormal if some of each phase detection
(4118)
signal is not input three seconds after
power supply.
51CM connector open
Abnormal if 51CM connector circuit is open
for three minutes continuously after power
on.
FA
51CM: Thermal Relay
(4108)
(Note 1) The number in ( ) is the error cord of upper remote controller (M-NET)
Case
1 L1, L2, L3 are not connected
correctly.
2 Converse wiring of outdoor
power supply line (TB1) and
indoor power supply wire
(TB4)
1 L3-phased open-phase
Defective outdoor controller
board
1 Disconnection or contact
failure of 51CM connector
on outdoor controller board
2 Disconnection or contact
failure of 51CM
3 Defective 51CM (defective
parts)
4 Defective outdoor controller
Datos de fl ujo de aire
Judgment and action
1
• Check outdoor power supply connection
(TB1)
• Replace two phases (for example phase L1
and phase L2) out of three phases of outdoor
power supply line (TB1)
2 Check wiring connection.
1 Check power supply.
Replace outdoor controller board.
1 Check connecting wire.
2 Check connecting wire.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller board.
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