40
9. Trouble-shooting
Malfunction
Possible cause
Remedy
Unit cannot be started
1. No operating or control voltage
1. Check fuses, main switch and supply line
2. Malfunction not acknowledged
2. Acknowledge fault message
3. Pressure reservoir not depressurized
3. Wait until depressurized, the reservoir
pressure must be <0.8 bar for a start
4. Electric motor defective
4. Check connections, winding, etc.
5. Compressor defective
5. Turn the compressor manually; if required,
replace
6. Ambient temperature less than +1 °C
6. Make sure that the ambient temperature is
not less than +1 °C; install an auxiliary
heater, if required.
7. Display shows >>E<< in the pressure
7. Check sensors, connections and lines
or the temperature display
Unit stops during the
1. The intake regulator closes only partly
1. Repair or, if required, replace the intake
start-up phase
regulator; check solenoid valve - 19 -
2. Short-circuit in the unit
2. Determine and eliminate cause; replace
defective fuses
3. Connecting terminals in the switch
3. Check and re-tighten
cabinet are loose
4. No or insufficient pressure builds up
4. Check the pressure holding valve and the
in the pressure reservoir during the
opening function of the intake regulator
∆
phase
5. Oil too viscous
5. Select the type of oil according to the
ambient conditions or install an auxiliary
heater
6. >>E<< appears on the display
6. Check sensors, connections and lines
7. Maximum motor switching cycles
7. Avoid frequent manual on and off-switching,
exceeded due to too frequent manual
let electric motor cool down
on and off-switching
8. Timer for Y/
∆
-circuit set too short
8. Correct timer
Unit does not reach the
1. Pressure monitoring device set too low 1. Check, re-set
end pressure
2. Intake regulator opens only partly
2. Repair or, if necessary, replace intake
regulator; check solenoid valves - 19 + 20 -
3. Excessive air consumption
3. Reduce consumption or cut in a further
compressor
4. V-belt slips
4. Replace the V-belt set
5. Oil fine separator clogged
5. Replace oil fine separator
6. Air filter clogged
6. Carry out intermediate cleaning or replace
7. Heavy leakage in the compressor
7. Check unit
system
