Trane 4TXK6512G1000AA Service Manual page 179

LED flash
times of
indoor
Contents of Malfunction
outdoor
display
PCB
18 F11 Compressor out of step
19 F28
Position detection ioop fault
21 E9 Indoor overload shutdown
21 E5 Indoor anti-frost stop
Module temperature is
23 F5
too high(95 °C)
Compressor software
24 F2
over current
25 F23 Phase current over current
27 F24 CT of bolt
Outdoor condenser temp.
37 F34
too high protection
38 F35 Module unknown fault
43 F41
High pressure protection
45 F42 Low pressure protection
46 F43 Type matching exception
Diagnosis and Analysis
From the module board
From the module board,Appear 3 times in 10 minutes
and confirm
Compressor start up 2 minutes after the start of testing.If Tc≥
63°C
last on 5 minutes the compressor stop.When the
compressorstops for
more than 5 minutes and Tc < 39°C the compressor resumes
Compressor start up 2 minutes after the start of testing.If Tc≤
1°C
last on 2 minutes the compressor stop.When the
compressorstops for
more than 3 minutes and Tc > 9°Cthe compressor resumes.
Module temperature is too high for protection.
From themodule board.1.35 times the total current.
If the phase current of the compressor is greater than
the phase current stop value in EE of the outdoor unit
during runing,then compressor stop.
After 3 minutes compressor restart.
When the total current of the compressor is detected to be
less than0.5A and the compressor frequency is greater than
50Hz, theduration is one minute.
Then force the compressor to stop for 3 minutes,no
fault confirmed
Error lock if it occurs 3 times in 30 minutes
System high pressure protection
System low pressure protection
Indoor unit and outdoor unit do not match
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