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Troubleshooting | ACS 751/651 | 15ACS 751/651 | 15 | 15 en
4.2 By symptoms
Symptom Description Troubleshooting
The gauge pressure
rises after the recov-
ery and recycling phase
Previous recovery was incomplete
/leak across the valves
R Repeat recovery and check the gauge pres-
sure again at the end of recovery.
R Check if the plunger has worn out or if
there is contamination in the valve block.
Caution: Close the red and blue
valves on the internal refrigerant
cylinder before opening the solenoid.
The vacuum
phase does not start.
The vacuum pump does not start. R If the gauge pressure is high, per-
form recovery before vacuuming.
R Check the electrical and pipe connection to
the vacuum pump and associated solenoid.
R If the vacuum pump is on and yet, the
pressure does not decrease, check for
the pipe connection/blockage.
The leakage test at the end
of the vacuum phase failed.
Duration of the vacuum phase is too short. Vacuum phase duration is approximately 30 minutes
for vehicles with larger A/C systems (for example,
trucks require longer vacuum time).
Leakage in vehicle A/C system. Repair the vehicle A/C system.
Leakage in the ACS 751/651. Check HP, LP hoses and their connections.
Check if the plunger has worn out or if
there is contamination in the valve block.
Recharge is very slow or is
interrupted before the re-
quired quantity has been
filled to the vehicle.
Insufficient refrigerant in the
internal refrigerant container.
Fill internal refrigerant cylinder with fresh re-
frigerant. The optimum quantity is 8 kg - 9 kg.
Pressure in the R134a cylinder is too low. Fill internal refrigerant cylinder
with fresh refrigerant. The optimum pres-
sure is approximately 6-7 bar .
The quantity of refrig-
erant filled does not
match the set amount
Scale for the refrigerant cylin-
der is not calibrated.
Check the scale for the refrigerant cylinder with
a known weight. If the value does not match, cali-
brate the scale. See chapter 5 for more information.
Mechanical obstruction for the scale
of the refrigerant cylinder.
R Check if the movement of the scale and the re-
frigerant cylinder is blocked mechanically by oth-
er components.
R Remove any obstructions for the scale.
Compressor does not start R Power supply interrupted
R Check pressure switch
Check the electrical connection of the power switch,
pressure switch, compressor and capacitor of the
compressor.
White smoke emanates
from the vacuum pump.
Aspirated ambient air Inspect the vehicle A/C system and also the
ACS 751/651 for leaks and repair. Small quan-
tities of smoke in the first few minutes of op-
eration of the vacuum phase are permitted.
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