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Maintenance Technician Interview Questions and How to Answer Them

A maintenance interview is really a troubleshooting test wearing a nice shirt. The hiring manager wants to hear how you think when a line is down and production is standing behind you with their arms crossed. Expect questions on electrical and mechanical basics, safety, preventive maintenance and how you talk to the people whose machine you just fixed.

12 questions8 minute read

Part 1

1.Walk me through how you troubleshoot a machine that won't start.

Why they ask

This is the core of the job. They want a method, not a lucky guess, because guessing burns parts and downtime.

How to answer

  • Start by talking to the operator: what happened right before it stopped, any alarms, any noises
  • Check the obvious first: power, e-stops, guard switches, air pressure, tripped overloads
  • Pull up the electrical print and follow the start circuit with your meter, point by point
  • Check the PLC or HMI for fault codes and input status if the machine has one
  • Fix the root cause, test it with the operator watching, and log what you found in the CMMS

2.Explain your lockout/tagout process on a piece of equipment with more than one energy source.

Why they ask

Stored energy kills maintenance techs. They need to know you'll lock out every source, every time, even when the supervisor is pushing.

How to answer

  • Identify every energy source: electrical, pneumatic, hydraulic, gravity, springs, thermal
  • Notify affected operators, shut down normally, then isolate and apply your own lock and tag
  • Bleed or block stored energy, like dropping air pressure or pinning a raised ram
  • Verify zero energy by trying the start button and metering the circuit
  • Follow the site's written procedure for that machine, and mention group lockout on bigger jobs

3.Tell me about the worst breakdown you've dealt with. What happened and what did you do?

Why they ask

A real story shows how you work under pressure and whether you fix symptoms or causes.

How to answer

  • Pick a real, specific failure: a seized conveyor drive, a hydraulic press losing pressure, a chiller tripping
  • Describe what production lost while it was down, in plain terms, without inventing numbers
  • Walk through your troubleshooting steps and any dead ends
  • Say what the root cause turned out to be
  • Explain what you changed afterward so it didn't happen again, like a new PM task or a spare on the shelf
4.How do you read and use electrical schematics and ladder logic?

Why they ask

Plenty of techs are strong mechanically but freeze in front of a panel. They want to know which side of that line you're on.

How to answer

  • Say honestly how comfortable you are with control circuits, motor starters and VFDs
  • Describe following a rung in ladder logic to see which input isn't making
  • Mention the PLC platforms you've touched, like Allen-Bradley or Siemens, and whether you can go online or just read
  • Give one example of finding a fault from the print, like a bad prox sensor or a failed relay coil
5.What's your experience with preventive and predictive maintenance?

Why they ask

Good maintenance departments spend more time preventing breakdowns than fixing them. They want someone who does PMs properly, not someone who pencil-whips them.

How to answer

  • Describe the PM work you've done: lubrication routes, belt and chain checks, filter changes, bearing inspections
  • Mention any predictive tools you've used, like vibration pens, infrared cameras or oil analysis
  • Explain how you close out a work order in the CMMS with real notes
  • Give an example where a PM caught something before it failed

Part 2

6.A pump is running but not moving enough fluid. What do you check?

Why they ask

This is a quick mechanical reasoning test. They want to hear you work from simple to complex.

How to answer

  • Check suction side first: clogged strainer, closed valve, low tank level, air leaks
  • Listen for cavitation and check rotation direction, especially after motor work
  • Look at worn impellers, wear rings or a slipping coupling
  • Check discharge side for a partly closed valve or a blockage
  • Compare readings to the pump curve or normal gauge readings if the plant logs them
7.Two machines go down at the same time and both supervisors want you now. What do you do?

Why they ask

Triage is part of the job. They want to see you prioritize by safety and production impact, not by who's yelling loudest.

How to answer

  • Safety issues come first, always
  • Next, the machine that's a bottleneck or has no backup
  • Call your lead or maintenance manager so the decision isn't only yours
  • Tell both supervisors what's happening and when you expect to get to them
  • Get a quick look at the second machine if it might be a simple reset
8.Which tools and test equipment are you comfortable with?

Why they ask

They want to know what you can do on day one and what they'll need to train.

How to answer

  • Name the meters you use: a multimeter, clamp meter, megger
  • Mention mechanical tools and skills: alignment tools, torque wrenches, welding or fabrication if you have them
  • Say whether you bring your own hand tools
  • Be honest about gaps and what you're working on learning
9.What licenses or certifications do you hold?

Why they ask

Some work legally needs a license, and some plants pay attention to specific certificates.

How to answer

  • List what you actually hold, like EPA refrigerant certification for HVAC work, a forklift or aerial lift card, or a welding cert
  • If electrical work is involved, say if you hold a license and note that electrical licensing rules differ by state
  • Mention any in-progress training or apprenticeship
  • Don't overstate. They may ask to see the card
10.Tell me about a time you disagreed with a supervisor or operator about a repair.

Why they ask

Maintenance sits between production and safety. They want to know you can push back politely and stand firm when it matters.

How to answer

  • Pick a real disagreement, like a supervisor wanting a guard left off to run a few more parts
  • Explain how you laid out the risk in plain terms
  • Show that you offered an alternative, like a temporary fix or a scheduled repair
  • Share how it ended and what you learned about working with that person

Part 3

11.How do you document your work and hand off to the next shift?

Why they ask

An undocumented repair is a mystery for the next tech at a bad time of night.

How to answer

  • Close work orders in the CMMS with what failed, why and what you replaced
  • Log parts used so the storeroom can reorder
  • Leave clear notes or talk face to face at shift change on anything still open
  • Flag temporary fixes so they get a permanent repair scheduled
12.Why do you want to work here, and what equipment are you hoping to learn?

Why they ask

They want to see that you looked at what they run and that you'll stick around.

How to answer

  • Mention what you know about their site: packaging lines, CNC machines, a hospital's boilers and chillers, whatever fits
  • Connect it to your experience
  • Name something you want to get better at, like PLCs or hydraulics
  • Keep it honest and short

Questions to ask them

Ask at least two. It shows you're picking them too.

  • How much of the team's week goes to planned work compared with breakdowns?
  • Which CMMS do you use, and do techs close their own work orders?
  • What equipment gives you the most trouble right now?
  • How does on-call work, and how often would I be on the rotation?
  • Is there training for PLCs or other skills, and how do techs move up to the next level here?
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