Pfeiffer Vacuum UnoLine UNO 35

Questions and Answers

U
ujamesAug 10, 2025
What to do if my Pfeiffer Vacuum UnoLine UNO 35 Water Pump will not start?
- M
  michael62Aug 10, 2025
  If your Pfeiffer Vacuum Water Pump won't start, several factors could be at play. First, check that the mains voltage is correct and the mains fuse protection is intact, also inspect the motor switch. If the pump temperature is too low, warm it up to above 12°C. A tripped thermal protection switch could be the culprit, so identify and resolve the cause of overheating, allowing the pump to cool down if needed. The pump system might be dirty or damaged, requiring cleaning or overhauling; contact Pfeiffer Vacuum Service if necessary. Lastly, a defective motor would necessitate replacement.
A
Arthur NobleAug 15, 2025
Why does my Pfeiffer Vacuum UnoLine UNO 35 switch off after starting?
- O
  orojasAug 15, 2025
  If your Pfeiffer Vacuum Water Pump switches off after starting, it might be due to a few reasons. The thermal protection switch of the motor may have been activated, so detect and correct the cause of overheating, and allow the motor to cool. Alternatively, the mains fuse protection might have triggered because of an overload (e.g., cold start); in this case, warm up the pump. Also, high exhaust pressure could be the cause, so check the opening of the exhaust line and exhaust accessories.
J
jamesolsonAug 20, 2025
Why is the pumping speed of my Pfeiffer Vacuum UnoLine UNO 35 too low?
- K
  Kimberly WilliamsAug 20, 2025
  If your Pfeiffer Vacuum Water Pump's pumping speed is too low, the intake line might not be well-dimensioned. Ensure connections are as short as possible and that cross-sections are adequately sized. Additionally, high exhaust pressure could be the issue, so inspect the opening of the exhaust line and exhaust accessories.
C
carlsondeborahAug 25, 2025
What to do if my Pfeiffer Vacuum Water Pump does not attain final pressure?
- W
  wmartinAug 26, 2025
  If your Pfeiffer Vacuum Water Pump isn't reaching its final pressure, start by checking the gauge for accuracy and verify the final pressure without any connected installations. The pump or connected accessories may be dirty, requiring cleaning and inspection for contamination. If the operating fluid is dirty, run the pump for an extended period with the gas ballast valve open or replace the operating fluid. A leak in the system could also be the cause, so repair any leaks. Low operating fluid levels can also prevent the pump from reaching final pressure, so top off the operating fluid. If the pump is damaged, contact Pfeiffer Vacuum Service.
W
wnelsonAug 30, 2025
Why does my Pfeiffer Vacuum UnoLine UNO 35 Water Pump make unusual operating noises?
- M
  Michael MejiaAug 30, 2025
  If you notice unusual operating noises from your Pfeiffer Vacuum Water Pump, the silencer might be dirty, requiring cleaning or replacement. Alternatively, there could be damage to the pump system, suggesting a need to clean and overhaul the pump; contact Pfeiffer Vacuum Service if necessary. Finally, a defective motor bearing could be the cause, necessitating motor replacement; contact Pfeiffer Vacuum Service if needed.
C
Charles BradySep 4, 2025
How to fix loss of operating fluid in Pfeiffer Vacuum UnoLine UNO 35?
- T
  Tara GomezSep 4, 2025
  If you're experiencing loss of operating fluid in your Pfeiffer Vacuum Water Pump, the swivel gasket might be leaky. Check its tightness and replace it if necessary. Alternatively, the radial shaft seal ring could be leaking, requiring replacement of the seal ring and inspection of the bushing. Operational loss of operating fluid may also occur; if necessary, install an oil mist filter and oil return unit.