7 Problem solving
Attention
Use only authorised parts. Any damage or malfunction caused by the use of unauthorised
parts is not covered by Warranty or Product Liability.
Apply all relevant Safety precautions.
Before carrying out any maintenance or repair work on the compressor: move start/stop
switch (1) to position 0FF.
Wait until the compressor has stopped and switch off the voltage.
Open the isolating switch to prevent an accidental start.
Close the air outlet valve.
On units with air receiver, open the manual condensate drain valve.
Compressor problems
Condition Fault Remedy
The machine does not start No power Check power supply
Fuse blown Replace fuse
The main motor thermal
protection has tripped
On single-phase units: check and let the
motor cool down; move compressor start/
stop switch to 0, then to I
The main motor thermal
protection has tripped
On three-phase units: check and let the
motor cool down, reset the overload
protection; move compressor start/stop
switch to 0, then to I
Pressure release valve of
pressure switch (PSR) keeps
blowing after 5 seconds
Unloader valve leaks Clean the valve
Replace if damaged
Instruction book
38 2920 7002 03