Chapter 1 – Lift Fault Diagnosis

What you will find

The five faults in this chapter are the ones that, in the author’s field experience, have most often left a lift out of service, many times with people inside. Each one follows the same order:

• Symptom: what the user sees and what the technician finds on arrival.
• Probable causes: from most to least frequent.
• Step-by-step checks: in a practical order, with tools and measurements.
• Safety: what must never be skipped on that fault.

Includes a six-step diagnostic method, field tips from Ramón, four original diagrams and a quick checklist to keep on your phone.

Who it is for

Lift maintenance technicians, electricians starting out in the trade and independent technicians. It assumes you know basic electrics, can use a multimeter and have safety training for work in the shaft, the pit and on the car roof.

Contents

1. Before you start: who it is for, six-step diagnostic method and recommended tools
2. General safety for every fault and how the safety chain works
3. Fault 1 · Stretched overspeed governor rope
4. Fault 2 · Frequency inverter tripped or burnt out
5. Fault 3 · Blocked infrared light curtain
6. Fault 4 · Car door operator
7. Fault 5 · Landing and car doors out of adjustment
8. Summary: quick checklist and checklist before returning the lift to service