Will Not Drain Oil; Will Not Air Purge - Bosch ACS 653 Repair Instruction

ACS 653, ACS 663 Service Manual

Will Not Drain Oil

1. Verify the accumulator transducer is
functioning properly.
2. Is an Oil Drain Error Message displayed?
• Error 1 - Oil drain halted. Pressure error.
Retry or exit?
a. Verify operation of the compressor
oil return solenoid (S13) (check the
power board and control board).
b. C h e c k Ta n k L i q u i d s o l e n o i d ,
evacuating the tank with a recovery
service unit in advance.
c. Verify there is 454 g (1 lb) minimum
chargeable refrigerant in the ISV.
• Error 2 - Oil drain halted. Flow error.
Retry or exit?.
Verify the oil drain solenoid (S3) is
receiving power and opening properly.
a. If not receiving power, check the
continuity of the wiring between
solenoid and power board. Repair
as needed.
b. If the oil drain solenoid is receiving
power and is opening, verify the oil
drain line isn't plugged.
c. If the wiring is correct and no power is
being applied to the solenoid, replace
the power board.
d. If the unit continues to drain oil for four
minutes, Oil Drain Error 2 will display.
The accumulator may be filled with oil
that must be drained manually.
NOTE: 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. Access the maintenance
counters in the service menu. Comparing the
recover cycles to the oil drain cycles may
indicate user operational errors.
Robert Bosch GmbH
Diagnostics and Testing

Will Not Air Purge

1. Verify the air purge solenoid (S1) 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.
NOTE: Verify the tank temperature sensor and
pressure transducer are functioning properly.
To verify tank pressure transducer, perform
the following:
• O p e n s e r v i c e m e n u a n d g o i n t o
Output test.
• Open Tank solenoid and high-side charge
solenoid, check the value on high gauge.
2. Manually purge air.
• Ve r i f y a i r p u r g e t r a n s d u c e r a n d
temperature sensor are reading correctly.
• The air purge function will time out after
four minutes if the ISV pressure doesn't
reach the calculated pressure within that
time. This may indicate excessive air in
the ISV that must be purged.
3. If the air doesn't purge, check the 0.028-in.
orifice between the ISV pressure transducer
and air purge solenoid (S1) for debris.
• Check Tank Liquid solenoid, evacuating
the tank with a recovery service unit in
advance. If the orifice is contaminated or
defective, repair or replace as needed.
• If the orifice is operating properly, proceed
to the next step.
4. To test the temperature sensor, determine
the ISV temperature and compare it to the
temp probe reading in the air purge info
screen.
5. To verify pressure transducer, perform the
following:
• O p e n s e r v i c e m e n u a n d g o i n t o
Output test to enable the tank liquid
solenoid S22, high-side charge solenoid
S6 and low-side charge solenoid S7.
• Compare the data with the one readable
in input test or in the tool bar (enable
"display title info" in maintenance menu).
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SP00D00624 2021-04-08