Bosch 15 SEER2 Series - P6;LO-L9 (IPM module protection); AtL (Ambient Temperature Limited)

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Installation Instructions
Bosch 15 SEER2 Inverter Ducted Packaged Heat Pump - BTC 761701319 A (12.2022)
Error Code Description
P6/ L0-L9 IPM module protection
Table 31
When error codes L0-L9 appears occasionally, no action is necessary. The
system will restart automatically after 6 minutes. Please follow the steps
below if L0-L9 appears frequently.
Figure 52
P6/L0-L9 (IPM module protection)
Diagnosis Handling
Yes
Check whether compressor
insulation resistance is greater
than 100KΩ
Yes
Check whether the resistance
of compressor U/V/W are
normal
Yes
Check whether there is the
same fault
No
No
Keep running
No
Replace the compressor
No
Check whether the
compressor wiring is normal
Reseat the wiring according
to wiring diagram
Replace the compressor
Replace the board and
check whether there is the
same fault.
Keep running
No
Yes
Replace the compressor and
check whether there is the
same fault.
Keep running
No
Yes
Yes
Error Code Description
AtL Ambient Temperature Limited
Table 32
When the ambient temperature returns to within the
operating range, the system will recover automatically.
Figure 53
AtL (Ambient Temperature Limited)
Diagnosis
Handling
No
Yes
No
Yes
No
Yes
Check whether the ambient
temperature is beyond the range
cooling: 40°F-125°F
heating: 5°F-86°F
Normal
Check whether sensor T4 is
seated normally (T4 for Heat
Pump only)
Unplug the sensor, and check
whether the resistance of T4 is
within the operational range
(Refer to Table 36)
No action is necessary.
restart the system.
Reseat the sensor according
to the wiring diagram
Replace the faulty T3/T4
sensor
Error Code Description
/ No display on control board
Table 33
Figure 54
No display on ODU control board
Diagnosis
Handling
No
No
No
Yes
Yes
Yes
Restart the system and check if
the LED display is working
Check if the high voltage
power supply is stable
Pull out the ODU motor
connection, check if there is
any display
Pull out the pressure
transducer connection,
check if there is any display
Replace ODU motor
Working properly
Correct power supply
Yes
Replace pressure
transducer
No
Replace ODU board