TOSOT DC INVERTER U-MATCH AIR CONDITIONERS
76
Origin of
malfunction
signal
Direction
changing
malfunction of
4-way valve
After the compressor starts operation in heating mode, if the
outdoor unit detects the difference between evaporator
temperature and indoor ambient temperature is lower than the
protective value for 10min successively, direction changing
malfunction of 4-way valve will be reported and the outdoor unit
will stop operation. The unit can automatically resume
operation in the first two malfunctions. If the malfunction occurs
3 times, the unit cannot be recovered automatically. Switch off
the unit or re-energize the unit after cutting off power to
eliminate this malfunction.
Communication
malfunction
between main
control and drive
Communicatio
n between
main control
board and
drive board
If the outdoor main control board does not receive data from
drive board, communication malfunction between main control
and drive will be reported. This malfunction can be eliminated
automatically.
Malfunction of
outdoor main
control memory
chip
Outdoor main
control board
If the memory chip of outdoor main control board is broken, the
unit cannot be started. The unit cannot be recovered
automatically. If the malfunction cannot be eliminated after
switching off the unit and then energizing the unit for several
times, please replace the outdoor main control board.
1.2 Description of Drive Malfunction
Main board dual 8 numeral tube Display Codes for Outdoor Unit of 09~48k
DC busbar over-voltage protection
IPM or PFC over-temperature protection
Current sense circuit error
IPM or PFC temperature sensor error
Compressor current protection
DC busbar under-voltage protection
Compressor startup failure
Compressor motor desynchronizing
Drive-to-main-control communication error
Compressor overload protection
AC current protection (input side)
Input AC voltage abnormality
Driving board memory chip error
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