Bosch ACS 751 Repair Instructions page 10

en 10 | ACS 751/651 | Troubleshooting
Error code Messages
5004 R134a RECHARGE
High Pressure shutdown
5005 R134a RECHARGE
Refrigerant Cylinder
5006 R134a RECHARGE
High Pressure in Vehi-
cle - Perform Recovery?
5007 R134a RECHARGE
High pressure in vehi-
cle - Perform Vacuuming
7100 Safety Switch
High pressure shutdown
7102 PSA
Sensor Connection Failed
7202 PST
Sensor Connection Failed
7302 PSV
Sensor Connection Failed
7402 Tank Temperature
Sensor Connection Failed
7403 Tank Temperature
Sensor Connection Failed
7501 R134a
Timeout
7502 R134a
Sensor Connection Failed
7503 R134a
Sensor Connection Failed
7601 UV Dye
Timeout
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Actions
R Check the connection to high pressure switch
R Check if the connection to the blue valve on the cylinder is open.
R Check for blockage in the blue hose
R Weight limit reached.
R Reduce quantity of refrigerant in internal refrigerant cylinder.
Full
R Scale is defective. Replace the scale.
R Press "Yes" to perform recharge.
R Press "No" to abort the operation.
R Press "Yes" to perform vacuuming.
R Press "No" to abort the operation.
R Allow the unit to cool for 30 minutes and switch on the unit. Try re-
covery/hose drain. Check if the blue knob on the internal refrig-
erant tank is closed. Open the blue knob If it is closed.
R Check if the electrical connections to the pressure switch are disconnected.
R Check if there is blockage in the discharge tube/manifold/blue hose be-
tween the tank and valve block. Rectify if there is leakage.
R In debug mode switch on CX and check if compressor is functioning.
R Temporarily interchange the PSA and PSV cable connection at the sen-
sor side. If the error is still with PSA sensor, then replace the top block.
R Check the electrical continuity of the sensor cable including connector at both
ends for each individual wires. If continuity test fails, then change the cable.
R Change the I/O board.
R Temporarily interchange the PST and PSV cable connection at the sen-
sor side. If the error is still with PST sensor, then replace the top block.
R Check the electrical continuity of the sensor cable including connector at both
ends for each individual wires. If continuity test fails, then change the cable.
R Change the I/O board.
R Temporarily interchange the PSV and PSA cable connection at the sen-
sor side. If the error is still with PSV sensor, then replace the top block.
R Check the electrical continuity of the sensor cable including connector at both
ends for each individual wires. If continuity test fails, then change the cable.
R Change the I/O board.
R Check the electrical continuity of the sensor ca-
ble including connector at both ends.
R Measure the resistance across two terminals of the temper-
ature sensor. If the measured resistance is found to be in-
finity or zero, change the temperature sensor.
R Replace the I/O board.
R Check the electrical continuity of the sensor ca-
ble including connector at both ends.
R Measure the resistance across two terminals of the temper-
ature sensor. If the measured resistance is found to be in-
finity or zero, change the temperature sensor.
R Replace the I/O board.
Replace the I/O board.
R Measure the resistance across:
- Red-Black
- Green-White
If any of the two measurement shows inifinite resistance, change the load sensor.
R Change the I/O board.
R Measure the resistance across
- Red-Black
- Green-White
If any of the two measurement shows inifinite resistance, change the load sensor.
R Change the I/O board.
Replace the I/O board.
Robert Bosch GmbH