1 689 975 197 (2006-09-22)
Robert Bosch GmbH
en
8
ACS 500
4.
By symptoms
Error pattern
Cause
Troubleshooting and correction
The digital display does not
light up.
Power supply interrupted.
Check mains input voltage.
Check fuse F1 on the control printed circuit board.
Replace defective fuse.
The control / display unit or the control
printed circuit board is defective.
Replace the control / display unit or control printed circuit
board.
The recovery and recycling phase
is slow or does not run at all.
Wrong working position of the external
refrigerant cylinder when filling.
Correct the working position of the external refrigerant cyl-
inder (see operating instructions).
Low pressure valve and/or high pressure
valve is/are closed.
Open the valve in question.
Flow in the hose lines may be faulty.
Check external and hose lines, whether the sealing rings
have become deformed due to tightening of the hose lines,
thereby possibly blocking the flow of the refrigerant. Care-
fully loosen hose lines and tighten them again by hand. Re-
place misshapen seals if necessary.
Excess pressure in internal refrigerant
cylinder.
Reduce pressure in the internal refrigerant cylinder by pull-
ing the metal ring on the safety valve for excess pressure
(see Chap. 3.2.4, Item 1).
Compressor defective.
Replace processing unit.
Filter and drier cartridge is saturated.
Replace the filter and drier cartridge.
Ice in expansion valve due to aspirated
water.
Heat expansion valve and replace all refrigerant from the
ACS with fresh refrigerant.
Do not switch OUT A solenoid valves.
Check relay on the control printed circuit board. If the re-
lay has blown, replace the control printed circuit board.
Check electrical connection to the solenoid valves.
Check connecting lines to the solenoid valves for continui-
ty. Replace defective connecting line.
Connecting lines to the solenoid valves have been
swapped. Check connection against connection diagram /
wiring harness (see Chap. 12.2).
Connecting lines to control printed circuit board have
been swapped. Check connection against connection dia-
gram / wiring harness (see Chap. 12.2).
The recovery and recycling phase
ends prematurely or not at all.
Incorrectly calibrated or faulty pressure
sensor.
Check pressure sensor (see Chap. 8.3).
The gauge pressure rises after the
recovery and recycling phase.
Valve pistons for the recovery and recy-
cling phase are leaking.
Check condition (contamination, wear) of the valve pistons
in the valve block.
The valve pistons for the filling phase
are leaking.
Caution
: Close the shutoff valve on the internal refriger-
ant cylinder before testing.
Check condition (contamination, wear) of the valve pistons
in the valve block.
The vacuum phase does not start. The vacuum pump does not start.
Check fuses F2 and F3 on the control PCB.
Check relay on the control printed circuit board. If the re-
lay has blown, replace the control printed circuit board.
The vacuum pump is mechanically blocked. Replace vacu-
um pump.
The leakage test at the end of the
vacuum phase failed.
Duration of the vacuum phase is too
short.
Vacuum phase duration: approx. 30 min. for vehicles
(for larger systems, e.g. commercial vehicles, set a corre-
spondingly longer vacuum time).
Leaking vehicle air conditioning system. Repair the vehicle's air conditioning system.
ACS is leaking internally.
Check external filling hoses and their connections
(e. g. are seals present?).
Check condition (contamination, wear) of the valve pistons
in the valve block.
Filling in the filling phase is very
slow or is interrupted before the
set quantity has been filled.
Insufficient refrigerant in the internal re-
frigerant container.
Fill internal refrigerant cylinder with fresh refrigerant.
Optimum amount: approx. 7 kg.
Pressure in the internal refrigerant cylin-
der is too low.
Fill internal refrigerant cylinder with fresh refrigerant.
Optimum pressure: approx. 6-7 bar.
The quantity filled does not match
the set amount.
Scale is not calibrated.
Check scale with a known weight. If the value does not
match, calibrate the scale (see Chap. 9.4.2).
Mechanical malfunction in the scale
movement.
Check whether the movement of the scale and the refriger-
ant cylinder is blocked mechanically by other components.
