Problem
Possible causes
Remedy
Vacuum pump does not reach
the specified ultimate pres-
sure
● Condensate in the vac-
uum pump
● Operate the vacuum pump at at-
mospheric pressure for a longer
period.
● Flushing gas nozzle/gas
ballast valve open
● Close the flushing gas nozzle/the
gas ballast valve.
● Soiled valves or dia-
phragms
● If necessary, clean or replace
the valves and diaphragms.
● Leak in system
● Locate and eliminate the leak.
Pumping speed of vacuum
pump too low
● The intake line is not
suitably dimensioned
● Make sure that connections are
short and cross sections ade-
quately dimensioned.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Unusual noises during opera-
tion
● Defective valves or dia-
phragms
● If necessary, clean or replace
the valves and diaphragms.
● Soiled suction chamber
● Clean suction chamber.
● The silencer is loose or
missing
● If necessary, check or replace
the silencer.
● Valves dirty or defective
● If necessary, clean or replace
the valves and diaphragms.
● Connection rod or motor
bearing defective
● Contact
.
Tbl. 18:
Troubleshooting on diaphragm pumps
12.2 Error codes
Errors (** Error E–––– **) always cause the vacuum pump to be switched off.
Warnings (* Warning F –––– *) do not cause the vacuum pump to be switched off.
Handling malfunction messages
1. Read out the error codes via the display and control panel or the PC.
2. Remove the cause of the malfunction.
3. Reset the error message with parameter
[P:009]
or by pressing the button
on the DCU.
Error code Problem
Possible causes
Remedy
Err098
Internal communication error between inter-
face board and drive
–
● Contact
Err117
Vacuum pump excess temperature
(> 90 °C)
● Insufficient cool-
ing
● Improve the cooling
● Check the operating conditions
Err174
Vacuum pump blocked
–
● Contact Pfeiffer Vacuum Service.
Tbl. 19:
Error messages for vacuum pump
Error code
Problem
Possible causes
Remedy
Wrn117
High temperature vacuum pump (> 75 °C)
● Insufficient cooling
● Improve the cooling
● Check the operating conditions
Tbl. 20:
Warning messages for vacuum pump
12.3 Warning and error messages when operating with DCU
Besides the device-specific warning and error messages on the electronic drive unit, additional messag-
es are displayed with the connected display and control panel.
Malfunctions
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