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PROBLEM SYMPTOMS RESOLUTION
Excessive air tank
pressure – safety
valve pops off
Pressure switch does not •
shut of motor when com-
pressor reaches cut-out
pressure
Pressure switch cut-out •
too high
Set the On/Off switch to Off, if the unit •
does not shut off contact a Bosch fac-
tory service center or a Bosch authorized
service center
Contact a Bosch factory service center or •
a Bosch authorized service center
Air leaks Tube fittings are not tight •
enough
Tighten fittings where air can be heard •
escaping. Check fittings with soapy water
solution. Do not overtighten.
Air leaks in air tank or
at air tank welds
Defective air tank• Air tank must be replaced. Do not repair •
the leak
Warning:• Risk of bursting. Do not drill
into, weld or otherwise modify air tank or
it will weaken. The air tank can rupture or
explode.
Air leaks between
head and valve plate
Leaking seals• Contact a Bosch factory service center or •
a Bosch authorized service center
Air leaks from safety
valve
Defective safety valve• Operate safety valve manually by pull-•
ing on ring. If valve still leaks, it must be
replaced.
Knocking noise Defective safety valve•
Pump oil is low•
Carbon build-up in pump•
Operate safety valve manually by pull-•
ing on ring. If valve still leaks, it must be
replaced.
Add no-detergent oil to pump. •
Contact a Bosch factory service center or •
a Bosch authorized service center
Pressure reading on
the regulated pressure
gauge drops when an
accessory is used
Regulator is not adjusted •
correctly for accessory
being used
It is normal for some pressure drop to •
occur when an accessory is used, adjust
the regulator.
Note:• Adjust the regulated pressure
under flow conditions while accessory is
being used.
trouble sHootInG
This section provides a list of the more frequently encountered malfunctions, their causes and corrective
actions. The operator or maintenance personnel can perform some corrective actions, and others may
require the assistance of a qualied Bosch technician or your dealer.