SM830035
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4
4. Service procedures
Wired remote
controller
display
Wireless remote
controller
display
Possible causes of troubles
• Thermistor failure
• Non volatile memory IC (EEPROM) is abnormal (Indoor control panel)
PC compressor motor is overloaded.
PC compressor motor is locked.
Compressor current detection circuit is defective.
Scroll proteiton thermostat
No detection of scroll protection thermostat
Low-pressure switch
Power supply voltage between phases is unbalanced.
Standard comp. contactor (Mg SW)is chattering.
v:Operation
lamp
O: Timer lamp
v:Heat stand-
by lamp
Indoor thermistor is either
open or short.
Outdoor thermistor is either
open or short.
Protective device for
compressor is activated.
Indoor coil temp. (E1 = TH2) cannot be detected.
Indoor coil temp. (E2 = TH3) cannot be detected.
Indoor room temperature cannot be detected.
Discharge gas temp.A (PC compressor=TH0A) cannot be detected.
Outdoor coil liquid temp. (C1 = TH0E) cannot be detected.
Outdoor coil gas temp. (C2 = TH0C) cannot be detected.
Scroll protection thermostat
F01
F02
F10
F04
F06
F07
F09
F29
H01
H02
H03
H04
H05
H06
H17
H18
O: flashes
v: OFF
• Fault with
compressor
and its circuit
Operation lamp
and heat stand-by
lamp flash
alternately.
O: Operation
lamp
O: Timer lamp
v:Heat stand-
by lamp
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