Boolean search strings for maintenance technicians: industrial, facilities or apartment, PLCs, CMRT and boiler licenses

A maintenance technician search has to name the setting first, because one title covers three different jobs: industrial technicians who keep production lines running (PLCs, motor controls, hydraulics and pneumatics), facilities technicians who look after a building's HVAC, plumbing and electrical, and apartment technicians who turn units and clear resident work orders. The Bureau of Labor Statistics splits them across separate occupations. As of November 2026, Indeed's own guide for repair and maintenance candidates documents AND, OR, NOT, quotes, parentheses and a skill: field, and its example strings search for CMRT, the maintenance and reliability technician credential.

Below are ten strings by setting and craft, and what Indeed, LinkedIn and Google support as of November 2026. For licensed electrical work at the same plants, see Boolean search strings for electricians; for the machine shop next door, see Boolean search strings for machinists.

Settings, crafts and credentials that change what a maintenance technician search finds

• Three occupations behind one title. The BLS page for general maintenance and repair workers says they "fix and maintain machines, mechanical equipment, and buildings" and hand licensed work to electricians or HVAC mechanics. Its page for industrial machinery mechanics, maintenance workers and millwrights says mechanics diagnose and do major repairs, maintenance workers do minor ones, and millwrights install and move machinery. Write the setting into its own block.
• CMRT. SMRP's CMRT page says the exam covers four domains: Maintenance Practices, Preventative and Predictive Maintenance, Troubleshooting and Analysis, and Corrective Maintenance, as of November 2026. Its certification page says CMRT is accredited by the ANSI National Accreditation Board under ISO/IEC 17024, and SMRP publishes certificant directories. Its sister credential, CMRP, includes business and management, so it usually belongs to engineers and managers.
• CAMT. The National Apartment Association's CAMT page requires at least 12 months of apartment or rental housing maintenance experience, the coursework and an exam; candidates who lack the experience earn a Provisional CAMT that expires after two years. It is the clearest signal of an apartment technician rather than a plant technician.
• EPA Section 608. EPA's technician certification page requires it for technicians who maintain, service, repair or dispose of equipment that could release refrigerants, lists Type I, Type II, Type III and Universal, and says the credentials do not expire. Facilities and apartment technicians who handle air conditioners and refrigerators often list it; for full HVAC roles, see Boolean search strings for HVAC technicians.
• Boiler licenses are state and city rules. Minnesota, for example, says in Statutes section 326B.972 that to operate a boiler, steam engine or steam turbine a person must hold a license for the grade covering it, and section 326B.978 sets chief, first class, second class and special engineer classes, as of November 2026. Other states and cities set their own rules, so ask the client which license the job needs. This is not legal advice.
• LOTO and OSHA cards are training, not licenses. OSHA's hazardous energy page says the lockout/tagout standard covers the servicing and maintenance of machines and that authorized employees must be trained, which the employer does. Its Outreach Training Program page says none of its courses is a certification. Treat both as optional terms.

Ten Boolean strings by setting and craft

Swap in the setting, equipment and city from your own intake; these are examples.

Industrial and manufacturing

1. Electrical and PLC maintenance technician — Indeed Smart Sourcing
("maintenance technician" OR "maintenance mechanic" OR "industrial maintenance" OR "electro-mechanical technician") AND skill: (plc OR "motor controls" OR vfd OR "allen-bradley") AND (troubleshooting OR downtime) NOT (janitorial OR custodian OR apartment)

2. Mechanical, hydraulic and pneumatic technician — Indeed Smart Sourcing
("maintenance mechanic" OR "industrial mechanic" OR "maintenance technician") AND skill: (hydraulics OR pneumatics OR gearboxes OR bearings) AND (conveyors OR "packaging line" OR presses) NOT (sales OR "hydraulic engineer")

3. Reliability-minded technician with CMRT — Indeed Smart Sourcing
("maintenance mechanic" OR "maintenance technician") AND (CMRT OR "certified maintenance and reliability technician") AND ("predictive maintenance" OR "vibration analysis" OR "root cause")

4. Industrial millwright — LinkedIn general search
(millwright OR "industrial mechanic" OR "maintenance millwright") AND ("laser alignment" OR "shaft alignment" OR rigging OR "machine installation") NOT (millwork OR cabinetry OR carpenter)

Facilities, apartments and plant utilities

5. Building or facilities technician — Indeed Smart Sourcing
("building maintenance technician" OR "facilities technician" OR "facility maintenance technician" OR "building engineer") AND skill: (hvac OR plumbing OR electrical) AND ("work orders" OR "preventive maintenance") NOT (janitorial OR custodian OR housekeeping)

6. Apartment maintenance technician — Indeed Smart Sourcing
("maintenance technician" OR "apartment maintenance technician" OR "maintenance tech") AND ("make ready" OR "make-ready" OR "unit turns" OR turnovers) AND (CAMT OR "epa 608" OR appliances) NOT ("leasing consultant" OR "property manager")

7. Boiler operator or stationary engineer — LinkedIn general search
("stationary engineer" OR "boiler operator" OR "building engineer" OR "chief engineer") AND (boilers OR chillers OR "steam plant") AND (licensed OR license OR "first class") NOT (excavator OR crane OR "heavy equipment")

Maintenance systems and search-engine X-ray

8. Technician who runs PMs in a CMMS — LinkedIn Recruiter, Keywords filter
("maintenance technician" OR "maintenance mechanic" OR "multi-craft technician") AND (cmms OR maximo OR "sap pm" OR "work orders") AND ("preventive maintenance" OR "pm program" OR "predictive maintenance") NOT (planner OR scheduler)

9. Public profiles by craft and city — Google X-ray
site:linkedin.com/in "maintenance technician" "plc" "hydraulics" "greenville" -jobs -recruiter -janitorial

10. Recent public resumes — Google X-ray, filetype and date search
filetype:pdf "maintenance technician" resume "plc" "preventive maintenance" after:2025-01-01 -template -sample

Many strong technicians have no LinkedIn profile at all, so the X-rays reach a smaller pool than a job board. Treat what they return as leads and check the craft on the first call.

What Indeed, LinkedIn and Google actually support

Indeed's repair, maintenance and installation guide documents AND, OR, NOT, quotes and parentheses, a skill: field for the skills section of a resume, and fieldofstudy: and school: for education, as of November 2026. Its own maintenance examples pair ("maintenance mechanic" OR "maintenance technician") with CMRT and with skill: (hydraulic NOT pneumatic), which is the pattern strings 1 to 6 follow. It also says "lives in" before a city filters for current residents but can hide resumes without that exact phrase. Technicians are more likely to have a job-board resume than a detailed LinkedIn profile, so most strings here are written for Indeed.

LinkedIn's Boolean help page requires capital AND, OR and NOT, supports quotes and parentheses, evaluates quotes first, then parentheses, NOT, AND and OR, and does not support wildcards, so "make ready" and "make-ready" go in as a pair. LinkedIn Recruiter's Boolean page lists Job titles and Skills and Assessments among its Boolean filters and warns that too many facets in one query can cause a search result issue. Google's search operators page documents quotes, site:, the minus sign, filetype: and the before: and after: date operators, but not OR, which is why strings 9 and 10 use none.

Narrowing by equipment, shift and craft depth

Equipment narrows an industrial search more than any credential. A food or beverage plant runs fillers, case packers and palletizers; a stamping plant runs presses and robots; a distribution center runs conveyors and sortation. Ask which PLC platform the plant uses and whether the technician must edit logic or only go online to watch inputs and outputs, because the second group is far larger. The maintenance technician screening questions test that difference on the call.

Shift is rarely on a profile: plants run second, third and rotating 12-hour crews, and facilities roles carry on-call weekends, so raise it on the first call. Seniority shows in scope words: "maintenance technician III," "lead technician," "multi-craft" and "wrote the PM procedures," against "assisted" and "helper." LinkedIn's premium search filters page says Years of Experience is now only in Recruiter and Sales Navigator.

False positives worth excluding with NOT

• Janitorial and custodial staff. Cleaning and porter roles often carry "maintenance" in the title. Exclude janitorial, custodian and housekeeping for skilled roles.
• Lawn and landscape maintenance. Exclude "lawn care," landscaping and groundskeeper unless the client wants grounds work.
• Software and IT maintenance. "System maintenance," "database maintenance" and "application maintenance" come from IT profiles. Require plant or building words instead of excluding them one by one.
• Aircraft, fleet and quick-lube maintenance. A&P mechanics, diesel fleet technicians and oil-change shops all write "maintenance technician." Exclude aircraft, fleet and lube for plant roles; Boolean search strings for aircraft mechanics covers that trade.
• Planners, schedulers and managers. They write CMMS and work orders without turning a wrench. Exclude planner and scheduler for hands-on roles; the 30-60-90 day plan for maintenance managers covers the manager seat.
• MRO and industrial supply sales. Distributor reps list bearings, motors and hydraulics. Exclude sales and "account manager."
• Millwork and heavy equipment operators. Millwork means cabinets, and "operating engineer" is also a heavy equipment title. Exclude them in millwright and stationary engineer searches.

None of these strings targets or excludes anyone by age, sex, race, religion, national origin, disability or veteran status, and yours should not either. Union status is not a search term either: the NLRB lists refusing to hire or consider applicants because of their union membership, activities or sympathies as something employers may not do.

A worked example: three passes on a packaging-line technician search

An invented search, shown as it actually gets narrowed.

The craft block found plant technicians; the equipment block found the ones who know this plant's kind of line. Shift and on-call go on the first call, not in the string.

What a search cannot verify

A string can find someone whose resume names the right setting, craft and credential. It cannot show that they lock out every energy source before they start, that they can read a ladder diagram under pressure at 3 a.m., or that a license is current for the boiler on site. Check CMRT in SMRP's directories and state licenses with the issuing agency, then use the maintenance technician screening questions on the call. The maintenance technician job description template pins down the setting and crafts before you search, and the interview guide for manufacturing roles covers the later rounds.