Tosot TW12HQ3D6D, Service Manual

Page: 40 / 77

37
Installation and Maintenance
Service Manual
NO.
Malfunction
Name
Display Method of Indoor Unit
A/C status Possible Causes
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Operation
Indicator Cool
Indicator Heating
Indicator
34
Internal motor
(fan motor) do
not operate
H6
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present
location.
1. Bad contact of DC motor
feedback terminal.
2. Bad contact of DC motor
control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
35
Desynchro-
nizing of
compressor H7
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
36
PFC
protection
HC
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
Replace outdoor control panel AP1
or Reactor
37
Outdoor DC
fan motor
malfunction
L3
Outdoor DC fan motor
malfunction lead to compressor
stop operation,
DC fan motor malfunction or
system blocked or the connector
loosed
38
power
protection
L9
compressor stop operation and
Outdoor fan motor will stop
30s latter , 3 minutes latter
fan motor and compressor will
restart
To protect the electronical
components when detect high
power
39
Indoor unit
and outdoor
unit doesnt
match
LP
compressor and Outdoor fan
motor cant work
Indoor unit and outdoor unit doesnt
match
40
Failure start-
up
LC
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
Refer to the malfunction analysis
41 Defrosting
OFF 3S
and
blink
once
(during
blinking,
ON 10s
and
OFF
0.5s)
Defrosting will occur in heating
mode. Compressor will operate
while indoor fan will stop
operation.
Its the normal state
42
Anti-freezing
protection for
evaporator
E2
Not the error code. It’s the
status code for the operation