Will Not Drain Oil; Will Not Air Purge; Will Not Evacuate (Vacuum) - Bosch ACS 561 Repair Instructions

ACS 561 Service Manual
7. Verify that the accumulator transducer is
functioning properly by attaching a calibrated
gauge to the service port and compare
readings to those on the transducer ID plate.
8. Check the oil return, clear, tank fill/liquid,
and charge solenoids for bleed-through and
proper operation. Repair as needed.
9. If problem still exists, check the charge,
charge and vacuum solenoids, as applicable.
If the compressor fails to operate, refer
to Compressor Troubleshooting.

Will Not Drain Oil

1. Verify the accumulator transducer is func-
tioning properly.
2. Is an Oil Drain Error Message displayed?
• Error 1 - Can't get 1100mBar (16 psi) into
the accumulator to do oil drain.
a. Verify operation of the charge sole-
noid.
b. Verify liquid valve on ISV is open.
c. Verify there is 454g (1 lb) minimum
chargeable refrigerant in the ISV.
d. Verify the oil drain solenoid (S6) is
receiving power and opening properly.
• If not receiving power, check the
continuity of the wiring between
solenoid and power board. Repair
as needed.
• If the wiring is correct and no power
is being applied to the solenoid,
replace the power board.
• Verify the solenoid coil is opening
the solenoid properly.
• Error 2 - Pressure cannot drain from ac-
cumulator.
Verify the oil drain solenoid (S6) is receiv-
ing power and opening properly.
• If not receiving power, check the
continuity of the wiring between
solenoid and power board. Repair
as needed.
• If the wiring is correct and no power
is being applied to the solenoid,
replace the power board.
• If the unit continually drains oil until
Oil Drain Error 2 displays, the ac-
cumulator may be filled with oil that
must be manually drained. Manually
drain accumulator until empty.
Robert Bosch GmbH
Diagnostics and Testing
Determine the reason the oil separator
isn't draining properly. Improper draining
could be caused by a faulty component
or improper operation by the user. Ac-
cess the maintenance counters in the
service menu. Comparing the recover
cycles to the oil drain cycles may in-
dicate user operational errors. If the
procedure in step "a" does not solve the
problem, replace the control board.

Will Not Air Purge

If the air doesn't purge, check the air purge
pressure relief valve. If the air purge pressure
relief valve is locked, open it manually.

Will Not Evacuate (Vacuum)

The vacuum pump should be running during
this test. If the pump does not run, refer to
Vacuum Pump Troubleshooting in the Vacuum
Pump section of this manual.
1. Verify the service hoses are properly at-
tached to the unit (valves open) without any
restrictions.
2. Make sure the two plastic vacuum lines
are snug at both ends and not obstructed.
Check the pneumatic fittings for leaks.
3. Check for proper vacuum oil level in the
vacuum pump sight glass (oil level should
be in the center of the sight glass while the
pump is running). Replace vacuum pump
oil if necessary.
4. Check for suction at the intake of the pump.
If there is none, replace the pump.
5. Verify that the vacuum solenoid is receiv-
ing power,and low-side and high-side inlet
valves are open.
• If not receiving power, check continuity
of the wiring between the solenoid and
power board. Repair as needed.
• If the wiring is correct and no power is
being applied to the solenoid, replace the
power board.
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SP00D00517 2018-07-11