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Troubleshooting
SiMT041311E
129
Service Diagnosis
2.4
When operation starts, safety breaker works.
Supposed
Causes
Insufficient capacity of safety breaker
Earth leakage breaker is too sensitive.
Not exclusive circuit
The power supply voltage fluctuation is not within ±10% from the rated value.
The size of connecting wire is thin.
Air is mixed.
Overfilling of refrigerant
Defective outdoor unit PCB (short circuit)
Troubleshooting
Check No.20
Refer to P.189
Replace the safety breaker
to a specified one.
Increase the set value of
the earth leakage current
on the breaker (or replace
the breaker).
Use the exclusive circuit.
Replace the wire to a
specified one by referring to
the electric wire distance
described in the installation
manual.
Contact with an electric
power company.
Provide the required space.
Replace the wire to the
specified one.
Replace the outdoor unit
PCB.
Replace the fan motor or
the four way valve coil.
Conduct vacuum drying, fill
the refrigerant of specified
volume.
Is the capacity of
safety breaker as
specified?
(R19680)
Caution
Does the earth leakage
breaker work?
Remove the fan motor or the
four way valve coil and check.
· Air is mixed in.
· Overfilling of refrigerant is
supposed.
Is it an exclusive circuit?
NO
NO
NO
NG
NG
YES
NO
NO
YES
NO
YES
YES
YES
YES
YES
Is the size of wire for
the exclusive circuit as
specified?
OK
Is there required
installation space?
NO
Is the size of the
connecting wire as
specified?
Check No. 20
Short circuit check
Check No. 20
Short circuit check
OK
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Is the
power supply voltage
fluctuation within ±10% from
the rated value?