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Installation Instructions
Bosch 18 SEER2 Series Inverter Ducted Packaged Heat Pump - BTC 761703103 A (11.2022)
Error Code Description
L0-L9 IPM module protection
Table 29
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 49
L0-L9 ( IPM module protection)
Diagnosis Handling
Yes
Check for blockages in
refrigerant piping.
No
Check to see if there are any
abnormal noises from the
compressor
No
Power off and wait at least 3
minutes before powering on.
Check if the unit can run at
least 1 hour
No
Yes
Check the refrigerant
charge and adjust
Yes
No L0-L9 issue happen again
No need to replace board
Check the winding resistance:
1. The resistance of two
windings (U, V, W) ≤ 2Ω
2. The resistance between
compressor winding and
ground ≥ 10MΩ
Replace compressor
No
Replace the compressor
Yes
Check whether the power
supply is stable
Correct the power supply
Clean the blockage
Yes
Replace control board
Power on and check if the
problem has been resolved.
Replace the unit
No
Yes
Run unit normally
Error Code Description
AtL Ambient Temperature Limited
Table 30
When the ambient temperature returns to within the
operating range, the system will recover automatically.
Figure 50
AtL (Ambient Temperature Limited)
Diagnosis
Handling
No
Yes
No
Yes
No
Yes
Check whether the ambient
temperature is beyond the range
cooling: 23°F-125°F
heating: -4°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 34)
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 31
Figure 51
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
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