Operating Manual - EVO
®
Line
[en] 07/2020 10.1
10 Troubleshooting
Fault Possible cause Remedy See chapter
Incorrect direction of rota-
tion
Phases reversed Reconnect 2 supply lines
System does not start No electricity Check
Combistat switches off due
to excessively high tem-
perature
Check oil level, cooling,
thermo-bypass
System difficult to start Motor output insufficient Check
Drive gear ratio "too fast" Check
Star-delta switchover
incorrect
Set
Screw compressor air end
is flooded with oil
Check
System has not been
discharged yet
Check
Oil filling too viscous Check viscosity 8.1.1
Differential pressure Pressure in the separator
cartridge is too high if the
cartridge is full or clogged
Replace separator car-
tridge
Combistat switches off
due to excessively high
temperature
Oil shortage Check oil level in oil reser-
voir and top up if neces-
sary
7.2
Oil filter soiled Replace oil filter cartridge
Thermostat defective Replace thermostat
Oil cooler soiled Clean oil cooler on air side,
clean on oil side if neces-
sary
Incorrect installation
a) Room ventilation
b) Exhaust air blocked
c) Thermal short circuit
Observe recommendation
on installing system
5.3
Combistat faulty or incor-
rectly adjusted
Adjust combistat or
replace
Fan has failed Check
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