[8-3 Refrigerant Control Problems ]
Outdoor Units Stop at Irregular Times.
Outdoor unit stops at times during operation.
2. Cause, check method and remedy
The first stop is not considered as an error, as the
unit turns to anti-restart mode for 3 minutes as a pre-
Abnormal high pressure
Abnormal discharge air temperature
Heatsink thermistor failure
Pressure sensor failure
Frost prevention tripping only under cooling mode
may be considered in addition to the above. (Freeze
protection is detected by one or all indoor units.)
Even the second stop is not considered as an error
when some specified errors occur. (eg. The third
stop is considered as an error when the thermistor
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Check method and remedy
Check the mode operated in the past by displaying
preliminary error history on LED display with SW4.
Reoperate the unit to find the mode that stops the
unit by displaying preliminary error history on LED
display with SW4.
Refer to the reference page for each error mode.
*Display the indoor piping temperature table with
SW4 to check whether the freeze proof operation
runs properly, and check the temperature.
Refer to the following page(s).9 LED Status Indica-
tors on the Outdoor Unit Circuit Board(page 325)