TOSOT DC INVERTER U-MATCH AIR CONDITIONERS
76
No.
Error
code
Malfunction
name
Origin of
malfunction
signal
Control description
18
U7
Direction
changing
malfunction of
4-way valve
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.
19
P6
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.
20
EE
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
Malfunction Item
Indoor Unit Display
DC busbar over-voltage protection
PH
IPM or PFC over-temperature protection
P8
Current sense circuit error
Pc
IPM or PFC temperature sensor error
P7
Compressor current protection
P5
DC busbar under-voltage protection
PL
Compressor startup failure
Lc
Drive module reset
P0
Compressor motor desynchronizing
H7
Phase loss
Ld
Drive-to-main-control communication error
P6
IPM protection
H5
Compressor overload protection
H3
AC current protection (input side)
PA
Charging circuit error
PU
PFC protection
Hc(48k only)
DC fan error
H6
Input AC voltage abnormality
PP
Driving board memory chip error
ee(18-36k)