Fault Messages That Can Occur During Recovery; Other Fault Messages; Faults During The Vacuum Phase; The Vacuum Pump Starts - Bosch ACS 810 Repair Instructions

11.1.3 Fault messages that can occur during
recovery
"CYLINDER FULL"
i
Check the weight of the internal refrigerant
cylinder and reduce the quantity of refrigerant in
the internal refrigerant cylinder.
"PRESSURE VALVE TOO HIGH"
1. Valves V1, V2, V3, and V4 must be open.
2. Check contacts for pressure switch (P2).
i
If the pressure is below 16 bar, voltage must be
present between pin 1 and pin 2, while pin 1 and
pin 4 are open.
i
If the pressure is above 16 bar, the contacts
between pin 1 and pin 2 open, while the pin 1 and
pin 4 contacts close.
 If the pressure switch (P2) does not work in
this way, replace it.
 If the pressure switch is working correctly,
check the wiring and the control PCB.
i
If no fault can be identified with the pressure
switch (P2), the line to the internal refrigerant
cylinder must be checked for clogging.
11.1.4

Other fault messages

Please see chapter 9.2
Robert Bosch GmbH
TROUBLESHOOTING AND ANALYSIS | ACS 810 | 25 |
11.2

Faults during the vacuum phase

11.2.1

The vacuum pump starts

i
The vacuum pump starts but no vacuum is
generated in the vehicle air conditioning system
1. Disconnect service hoses from vehicle.
2. Open HP and LP valves.
3. Check whether the hose connected to the vacuum
pump is correctly connected at both ends and is
not clogged.
4. Check the oil level in the vacuum pump.
i
The oil level should be in the middle of the sight
glass between the "full" and "empty" marks.
5. Check the pump vacuum output (the pressure must
fall to less than 0,033 mbar within 3 minutes).
6. If a vacuum of less than 0,033 mbar is reached:
Check whether voltage is present at EV1 and EV10.
7. Valves EV8 and EV9 must not leak.
8. Check whether EV1 switches
 If voltage is present and EV1 switches, replace
the vacuum pump.
¶
Check the pump vacuum output (the pressure must
fall to less than 0,033 mbar within 3 minutes).
11.2.2

The vacuum pump does not start

1. Check the oil level in the vacuum pump.
2. Check whether the vacuum pump is turned on (on/
off switch on the rear of the vacuum pump).
3. Check fuses F 2 and F 3 (12.5 A) on the control
PCB.
4. Check whether the relay trips after pressing the
vacuum key.
5. Check whether the vacuum pump is being supplied
with power (230 Volt).
i
A voltage of 12 Volt (DC) must be present at the
pump relay coil; 230 Volt must be present at the
output contacts. If one of these voltages is not
present, the computer PCB must be replaced.
"
Replace the vacuum pump if it does not start.
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1 689 975 253 2021-01-26