229
(4)
Phenomenon observed after shortcircuit, wire breakage on thermistors.
(a)
Indoor unit
Phenomenon
Thermistor
Shortcircuit
Broken wire
Cooling
Release of continuous compressor operation command
Heating
Continuous compressor operation command is not released.
Cooling
System can be operated normally.
Heating
High pressure control mode (Inverter stop command)
(b)
Outdoor unit
Phenomenon
Thermistor
Shortcircuit
Broken wire
Cooling
System can be operated normally.
Heating
Defrosting is not performed.
Cooling
System can be operated normally.
Heating
Defrosting is not operated.
All modes
Defrosting is performed for 10 minutes at approx. 1 hour.
Defrosting is performed for 10 minutes at intervals of approx. 30 minutes.
Compressor stop (There is no inverter output.)
Operation
mode
Room temperature
thermistor
Continuous compressor operation command is not released.
Release of continuous compressor operation command
Continuous compressor operation command is not released.
(Anti-frosting)
Hot keep (Indoor fan stop)
Heat exchanger
thermistor
Operation
mode
Heat exchanger
thermistor
Outdoor temperature
thermistor
Comp. dome
thermistor
Compressor overload protection is disabled.
(Can be operated.)
(5)
How to make sure of remote controller
Is remote
controller
normal?
YES
Again pushing
operating switch
Operating the unit?
NO
Does backup
switch operates?
Operating the unit.
NO
NO
YES
YES
Remote controller
defects
Abnormality is not
found.
(a)
Press the reset switch of the remote controller.
(b)
If all LCD are displayed after zero (0) display, it is ba-
sically normal.
Replace the display.
Control problem on
main unit
Is the unit
operable with remote
controller?
Normal
Defective remote
controller
NO
YES
(1)
Note (1) Check method of remote controller
Heat Pump model
Cooling only model
