Bosch BOVB36-18 - Page 36

36
|
Bosch IDS BOVB 18 Installation Instructions
10.2020 | Bosch Thermotechnology Corp.Data subject to change
Error Code Description
L0-L9 IPM module protection
Table 22
When L0-L9 appears occasionally, you don't need to do anything, the system will
restart automatically after 6 minutes. Please follow below step if L0-L9 consistently
appears.
Figure 62
L0-L9 ( IPM module protection)
Diagnosis Handling
Check whether the power
supply is stable
Yes
No
Check if there are abnormal
noises from the compressor
No
Power off and wait at least 3
mins then power on. Check if
the unit can run at least 1 hour.
No/L0-L9 issue happen again
Correct power supply
No
Yes
Yes
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
Yes
Replace the control board
Check the refrigerant
charge and adjust
Yes
Check if there is any blockage
in the pipe
Clean the blockage
Replace the compressor
Replace the compressor
Power on.
Check whether the problem
has been solved.
No
Replace the unit
Unit runs normally
Error Code Description
AtL Ambient Temperature Limited
Table 23
When the ambient temperature returns to within the operating range, the
system will recover automatically.
Figure 63
AtL (Ambient Temperature Limited)
Diagnosis
Handling
No
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 and normal (T4 for
Heat Pump only)
Unplug the sensor, Check
whether the resistance of T4
is in the range of Table 25
No action is necessary.
Try to restart the system.
Reseat the sensor according
to wiring diagram
Replace the fault T3/T
4
sensor
Yes
Error Code Description
No display on control board
Table 24
Figure 64
No display on control board
Diagnosis
Handling
No
No
No
Yes
Yes
Yes
Restart system and
Check if there is any display
Working properly
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.
Correct power supply
Replace ODU motor
Yes
Replace PT
Replace ODU board
No