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Building Service Mechanic

Ameren · Belleville, IL · Full time

Posted Sep 25, 2025 · We last checked this listing on Oct 6, 2026

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Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

Tell me about your training in industrial electrical and HVAC, and the work you have done as a journeyman.

What they are checking: Whether they meet the certificate and experience requirements and can apply them on the job.

Tell me about a time a safety rule slowed you down. What did you do?

What they are checking: Whether they follow safety practices every time, which the posting stresses.

How would you prepare for the written technical test?

What they are checking: Whether they know their weak areas and take the requirement seriously.

Tell me about a time you worked with building occupants who were unhappy about a problem.

What they are checking: Whether they can communicate calmly with employees while fixing issues.

What would you do

You have three work orders: a broken door, a server room getting hot and a leaking faucet. Which first and why?

What they are checking: Whether they prioritize based on risk to operations and safety.

You find a repair is beyond your training. What do you do?

What they are checking: Whether they know their limits and bring in the right help rather than risking injury.

About the work

A rooftop unit is not cooling. Walk me through how you troubleshoot it.

What they are checking: Whether they check airflow, electrical and refrigerant issues in a logical order.

What does your EPA Universal certification allow you to do, and what rules do you follow when recovering refrigerant?

What they are checking: Whether they handle refrigerant legally and safely.

How do you troubleshoot a motor that keeps tripping its breaker?

What they are checking: Whether they can diagnose electrical faults with meters instead of swapping parts.

How do you plan preventive maintenance for building systems?

What they are checking: Whether they think ahead to prevent failures in boilers, chillers and air handlers.

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The full job description

As published by Ameren.

About Ameren Illinois Ameren Illinois provides electric transmission and distribution service and natural gas distribution service. Every day, we deliver electricity to 1.2 million electric and 816,000 natural gas customers in central and southern Illinois. We deliver safe, reliable energy to more than 1,200 communities. Position Requirements: • Industrial Electrical Certificate (2 year or 14 months continuous) from a Company approved college or recognized trade school. Satisfactorily completed with a "C" or above in each class. • Must understand and perform standard practices and safety rules and must be careful, accurate, alert, thorough and observant. • Heating, Ventilation, Air Conditioning, and Refrigeration-HVAC and Refrigeration certificate (2 year or 14 month continuous) from a Company approved college or recognized trade school. Satisfactorily completed with a "C" or above in each class. • Must possess and maintain an EPA Universal Certification. • At least two years' work experience as a Journeyman, and presently working on that classification or must have been classified as an Office Building Mechanic in the previous 24 months and have met all of the educational requirements for that job classification. • Must achieve a passing score on a written test of technical knowledge. • Demonstrated ability to handle general maintenance work and the ability to read and understand blueprints and write clear and legible work reports and requisitions. • Receive a "Recommended" score on the CAST test. • Must possess and maintain a valid motor vehicle operator license class D. Hourly Pay: Grade Step BD 079 Step 1 of 1 (Top Step) - 50.54 USD Position is eligible for annual incentive payments based on company performance and subject to sole management discretion. Visit our Benefits & Perks Page for more information on benefits provided to regular full-time employees. ​ If end date is listed, the posting will come down at 12:00 am on that date: All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, ethnicity, age, disability, genetic information, military service or status, pregnancy, marital status, sexual orientation, gender identity or expression, or any other class, trait, or status protected by law.

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