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HQ Maintenance Srvcmn-1stClass

Ameren · Decatur, IL · Full time

Posted May 12, 2026 · 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 a repair outside your main trade that you handled, like plumbing or minor construction.

What they are checking: Whether they are the well-rounded building mechanic the role needs across many trades.

Tell me about a time you noticed a safety hazard in a building that wasn't your responsibility.

What they are checking: Whether they speak up and act on hazards, which matters in a utility with a strong safety culture.

What would you do

You're in the middle of a PM when someone reports a leaking pipe above an office. What do you do?

What they are checking: How they prioritize urgent problems and protect people and property without leaving a job unsafe.

About the work

A building's chilled water temperature is climbing on a hot afternoon. Walk me through how you'd figure out why.

What they are checking: Whether they can trace a problem across the chiller, cooling tower and controls instead of guessing at one part.

How do you reset heaters on a motor starter, and what would make you not reset it again?

What they are checking: Whether they know an overload trip is a symptom and find the cause before putting the motor back in service.

Tell me about troubleshooting low voltage lighting controls. What have you replaced, and how did you find the fault?

What they are checking: Their hands-on experience with relays and switches in lighting control systems named in the posting.

What lockout/tagout steps do you follow before working on a 480 volt piece of equipment?

What they are checking: Whether safe energy isolation is second nature for them on systems up to 600 volts.

How do pneumatic controls work on an air handling unit, and what goes wrong with them most often?

What they are checking: Whether they understand older pneumatic control systems that many headquarters buildings still run.

Describe your preventive maintenance routine for belts and lubrication on air handlers.

What they are checking: Whether they do PM properly, since bad lubrication and belt tension cause many avoidable breakdowns.

What do you look at on a boiler's gauges and controls during a walk-through?

What they are checking: Whether they can spot boiler problems early by reading pressure, temperature and flame safeguard indicators.

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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. Experience: A minimum 5 years commercial building maintenance performing general maintenance on building systems and equipment. Position requires knowledge, experience and training in electrical, HVAC, pneumatic controls, plumbing and building construction fields. Knowledge and/or training in Industrial Healthy & Safety. Must have experience working on electrical systems and equipment up to 600 volts and troubleshooting low voltage lighting controls, replace relays, switches, etc. Position requires the ability to perform basic plumbing repairs. Requirements: Successful candidate must have a working knowledge of the operation of boilers, chiller, cooling towers and air handling units and be able to visually identify problems through controls and instrument gauges as well as performing routine preventative maintenance and repair. Required to understand/reset heaters on starters and have knowledge of proper lubrication procedures and belt maintenance. Other: Must possess a valid Illinois class D drivers license. Successful candidate is required to become a member of IBEW Local 51. Reporting location is at Ameren Operating Center, 370 S. Main, Decatur, Illinois. Normal hours are 7am to 3:30pm. Overtime may be necessary on an as needed basis. Hourly Pay: Grade Step BC 050 Step 1 of 1 (Top Step) - 45.25 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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