Troubleshooting And Analysis; Faults During Recovery; 11.1.1 Compressor Starts; Compressor Does Not Start - Bosch ACS 810 Repair Instructions

en | 24 | ACS 810 | TROUBLESHOOTING AND ANALYSIS
11. TROUBLESHOOTING AND
ANALYSIS
i
This section briefly describes the various faults,
and the components that can cause the faults.
!
Before carrying out any service intervention, reduce
the ACS 810 pressure so that no refrigerant is
released.
11.1

Faults during recovery

11.1.1 Compressor starts

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EV3 and EV5 are closed for automatic self-cleaning.
The pressure at the pressure gages may not
change.
1. Service hoses (T1, T2) are not connected to the
vehicle.
2. Close service quick-release couplings.
3. Open HP and LP valves on the ACS 810.
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If the pressure at the pressure gages decreases
during self cleaning, check whether EV3 and EV5
are not supplied with power.
Power applied:
 Computer PCB (control PCB) defective.
"
Replace computer PCB (control PCB).
No voltage applied:
 Solenoid valve leaking.
"
Clean or replace solenoid valve.
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If the pressure at the pressure gages does not
decrease after self cleaning, check whether EV3,
EV5, and EV10 are supplied with power.
Power applied:
 Solenoid valve defective.
"
Clean or replace solenoid valve.
No voltage applied:
 Computer PCB (control PCB) defective.
"
Replace computer PCB (control PCB).
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If the pressure at the pressure gages falls slowly:
1. Check filter (F1).
If clogged, clean with compressed air (blow out).
2. Valves V1 and V3 must be open.
3. Check expansion valve (3) with a pressure gage.
Operating pressure must be between 2 and 2.3 bar.
4. Check compressor (6).
ACS 810 ends the recovery phase but the pressure at
the pressure gages does not change.
1. Valves V1, V2, V3, and V4 must be open.
2. HP and LP valves must be open.
3. Check that pressure sensor (P1) functions
properly.
11.1.2

Compressor does not start

1. Check fuses F 2 and F 3 (T 12.5 A) on control PCB.
2. Check whether 12 Volt (DC) is applied at the
compressor relay coil.
3. Check whether the compressor relay trips after
pressing the recovery key. It may be necessary to
replace the keypad or the control card.
4. Check whether 230 Volt is applied at the
compressor relay output pins.
 If no voltage is applied, the computer PCB is de-
fective and must be replaced.
 If voltage is applied, the current consumption
must be measured.
5. Measure current consumption. At 0 A or >=8 A the
compressor must be replaced.
Robert Bosch GmbH