Direct answer

Pfeiffer Vacuum Err045 is listed as “Excess temperature, motor or pump lower part.” for Turbopump in the source record linked below. This tells you what the alarm is called; it does not, by itself, identify a failed part or prove that every Pfeiffer Vacuum model uses the code in the same way.

Before acting, compare the machine label, product family, controller and displayed characters with the exact manual or support page for that equipment.

Operating guidance: Do not decide continued operation from the code alone.

What the source says

  • Displayed code: Err045
  • Manufacturer description: Excess temperature, motor or pump lower part.
  • Current product scope: Pfeiffer Vacuum Turbopump
  • Model/controller coverage: Not specified in the current dataset; confirm it in the source before using the meaning.

Safe next steps

  1. Record the complete code exactly as shown, including spaces, prefixes and leading zeros.
  2. Record the model number, controller name, firmware if visible, and what the machine was doing when the code appeared.
  3. Follow the owner-safe action captured with this record: Improve cooling, check operating conditions, and stop if the fault returns.
  4. Do not repeatedly clear or reset an alarm. A returning code needs model-specific diagnosis.
  5. Stop and escalate if there is smoke, a burning smell, leakage, abnormal pressure, unusual movement, repeated breaker trips or any risk to people.

Safety boundary

Use only external, owner-accessible checks. Stop if the alarm repeats or the machine behaves abnormally. Follow the equipment manual, workplace energy-control procedure and local requirements before service work.

What this code does not prove

An alarm name is not a confirmed root cause. Wiring, sensors, operating conditions, installation issues, controller configuration and upstream faults can produce similar symptoms. Do not replace a component solely because its name appears in the code description.

Applicability check

This record is organized at the Turbopump level. The seed data does not identify every compatible model, production year, controller or firmware revision. If the source does not cover the nameplate on your machine, treat this page as a possible match and continue with the correct manual rather than forcing the code to fit.

Source and verification

  • Primary source used for this record: pfeiffer-vacuum.com
  • Source checked in the project dataset: 2026-05-01
  • Evidence status: The code meaning is source-linked; exact model/controller applicability still requires confirmation.

The linked source takes priority if its wording, status colour or operator action differs from this page. See how sources are selected and the editorial policy.

When to contact qualified service

Escalate when the code returns after the permitted owner action, the model is outside the confirmed source scope, continued operation is unclear, or diagnosis requires panels, live measurements, fuel, refrigerant, pressure, high voltage, stored energy or moving machinery.

FAQ

What does Pfeiffer Vacuum Err045 mean?

Pfeiffer Vacuum lists Err045 as ‘Excess temperature, motor or pump lower part.’ for the product scope shown here. Confirm the exact model and controller against the linked source.

What should I do when Err045 appears?

Improve cooling, check operating conditions, and stop if the fault returns. Stop if the condition repeats, the machine behaves abnormally, or the work would require opening a hazardous system.

Does Err045 mean the same thing on every Pfeiffer Vacuum model?

Not necessarily. Code meanings and allowed actions can vary by product family, model, controller and firmware.