ACS 553, ACS 563 Service Manual
1 689 975 295 2021-04-13Robert Bosch GmbH
47
Diagnostics and Testing
1. Possible reasons to replace the power
board:
• No power to any components.
• A solenoid won’t open.
• Compressor and fan won’t start.
• Vacuum pump won’t start.
• A function does not start or finish a
process.
2. Do not replace the power board for these
issues:
• Display has lines, missing characters,
etc.
• Repeated read errors.
• Repeated communication errors.
• Display is blank at power up, contrast
can’t be adjusted, and power has been
The best way to troubleshoot is to go into the
diagnostic menu:
• If you are able to switch a solenoid or
board is likely okay.
• If the fan, compressor, or vacuum pump
is selected it should receive power.
Pressures can be verified with a gauge at
the accumulator port, low-side hose, and
by accessing the tank. The tank pressure
transducer can be checked by charging a hose
and comparing to the low-side transducer or
the gauges. They should be reasonably close
initially, but the gauge or low-side reading
should drop quickly if the tank is warm.
1. Possible reasons to replace control board:
• Repeated read errors.
• Repeated Communication errors.
• Keys don’t read (after verifying keypad).
Before reflashing, make sure the
unit has the latest software version installed.
controller if updating the software solves the
needed (refer to “Replacement Control Board”
in the Electrical section).
2. Do not replace the control board for these
issues:
• A solenoid will not open.
• A motor won’t start.
•
undercharge etc).
• The display is dim or dark (unless it can
not be adjusted).
• A pressure reading is wrong.
• High pressure, air purge time out, etc.
• A function doesn’t start or complete
(Recovery, Charge Tank Fill etc).
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