Error Diagnosis And Countermeasure Flow Chart; Error Code 26 - Bosch AHUW036A2 Service Manual

2.5 Error code 23
Display
code Title Cause of error
23 DC link High • DC link
/ Low voltage is
voltage above
420Vdc
• DC link
voltage is
below
140Vdc
Table 9 Error code 23
ODU Split 4, 6, 8
Fig. 11 ODU Split 4, 6, 8
Split ODU – 6 720 817 722 (2015/06)
Check point & Normal
condition
1. Check CN_(L), CN_(N)
connection
2. Check input voltage
3. Check PCB DC link
voltage sensor parts
Error handling instructions for Split outdoor unit
2.5.1

Error diagnosis and countermeasure flow chart

Is input voltage normal? No ->
Yes
Is inverter PCB No ->
assembly 1 power
connection normal?
Yes
Is PCB (Inverter) No ->
normal?
Yes
Recheck power and
installation condition
Table 10 Error diagnosis and countermeasure chart
Check Point
1. Check the WCN_P(L), P(N) connection condition ate the main PCB
(heater). Refer to wiring diagram.
2. Check the DC link voltage at no operation of compressor (280V).
3. Check the DC link voltage at operation of compressor (340V).
4. Check the DC link sensing signal (AHBW**6AO): 2.4~2.8V
(Graphic 12).
5. Check the DC link sensing signal (AHBW**8AO): 0.4~0.6V
(Graphic 13).
IN/I
1. Check power input voltage
1. Check power connection state
1. Replace PCB assembly 1
GND
Vdc
6 720 817 722-09.1I
11