September means different things to different people. For some, it’s football, harvest, or pumpkin-spice everything. But if you’re in aviation, construction, oil & gas, military, or disaster relief, September means one thing: pre-season heater maintenance.
And let’s be real: would you rather spend 30 minutes on a checklist now, feeling in control and prepared, or 30 hours stuck in the cold waiting for an emergency fix?
With decades of field experience behind us, we’ve seen how minor issues snowball into big downtime problems when heaters sit idle all summer. The good news? A handful of checks can keep your heaters running strong, efficient, and safe all winter.
✅ 1. Fuel System: Keep the Lifeblood Flowing
Think of your heater’s fuel system as its circulatory system — if the flow is blocked, everything else stops. Over time, fuel lines can crack, filters can clog, and sludge can settle in the tank, all of which can leave your unit refusing to fire up when you need it most.
What to check:
- Look over all fuel lines for cracks or leaks.
- Swap out filters (they’re inexpensive, and skipping this step can cost you far more later).
- Test the pump to make sure fuel flows smoothly and without hesitation.
💡 Pro Tip: Never trust leftover fuel from last winter. Drain it out and start with fresh fuel. We’ve seen heaters sidelined on the first cold snap thanks to sludge in the tank.
⚡ 2. Electrical & Battery: Spark Confidence, Not Headaches
Cold weather loves chewing through batteries — faster than your crew can empty a coffee pot on night shift. Weak batteries and corroded connections are often the silent culprits behind those dreaded “it won’t start” mornings.
What to check:
- Test your batteries and replace any that won’t hold a solid charge.
- Inspect wiring and connections for corrosion, wear, or loose ends.
- When you turn the key, listen for a clean, strong engagement — not grinding or hesitation.
💡 Pro Tip: Keep a spare battery around. Odds are it’ll sit there collecting dust until the day you really need it. That’s when it pays for itself.
🌬️ 3. Airflow & Ducting: Don’t Let Heat Get Choked Out
Your heater can roar at full power, but if ducting is torn or blocked, warm air never reaches your crew.
What to check:
- Inspect ducting for rips, holes, or collapses
- Clear dust, debris, and last year’s “tape fixes”
- Run a complete test to confirm steady airflow
💡 Pro Tip: Keep a couple of spare ducting sections close by. The day one collapses or tears, you’ll be glad you did. Nothing slows a crew down faster than cold air where warm air should be.
🛑 4. Safety Systems: Don’t Just Assume — Test Them
Your heater’s safety features are like seatbelts — you don’t think about them until something goes wrong. Don’t just cross your fingers and hope they’re working. Take the time to test them so you know for sure.
Things to check:
- Trip the high-limit switch and see if it actually does its job.
- Look at the sensors — are the readings believable or way off?
- Force a shutdown. Does the system kill power right away, or hesitate?
💡 Pro Tip: Hitting the “test” button isn’t enough. Put the heater under a real load and watch how the safeties respond. That’s the only way to know they’ll work when it counts.
🔎 5. General Inspection: The Quick Walk-Around
This one isn’t rocket science — take a few minutes to walk around your heater and see what jumps out. It’s often the small stuff you catch early that saves you from a bigger mess later.
Here’s what to do:
- Pop open the combustion chamber and knock out the soot. If it’s dirty, you’re burning more fuel than you need to.
- Give the belts, bolts, and panels a quick shake. Loose? Tighten them up. Worn? Replace them.
- Step back and take a look. Dents, cracks, anything that doesn’t look right — deal with it now.
💡 Pro Tip: Take a couple of quick photos while you’re doing your check. Next time, you’ll have a side-by-side to compare against, and it also keeps the crew accountable for what’s been covered.
💰 Why Pre-Season Heater Maintenance Matters
Skipping maintenance is a bit like ignoring the “check engine” light in your truck. It’ll keep running until it doesn’t. And when it quits, it usually happens at the worst possible time — say, 2 a.m. in -30°C with a crew standing around freezing.
What downtime really costs:
- Crews are sitting idle, and projects are falling behind.
- Emergency calls and overnight parts (never cheap).
- People are trying to work in unsafe, freezing conditions.
What maintenance gives you instead:
- Heaters that burn cleaner and waste less fuel.
- Equipment that lasts longer before needing a rebuild.
- Fewer unexpected breakdowns.
- Crews that can keep working instead of waiting for heat.
👉 At the end of the day, downtime drains budgets. Maintenance keeps you ahead of it.
🏆 Aerotech Advantage: Proven in the Coldest Conditions
Aerotech Herman Nelson heaters have been field-proven for decades in the harshest Canadian winters and are trusted worldwide in aviation, oil fields, construction sites, and military deployments.
We back that with:
- Pre-season service packages
- Full overhauls and rebuilds
- Genuine parts and accessories
- Lease-to-own programs for new units
📞 Don’t Wait for the First Frost
September is your last open window to prep heaters before service demand spikes. By October, schedules are packed, parts move fast, and downtime becomes a very real risk.
✅ Run this checklist today, or let our technicians handle it for you. You’ll thank yourself on that first freezing morning.
AEROTECH HERMAN NELSON INTL. INC.
📍 100 Eagle Drive, Winnipeg, MB, CANADA, R2R 1V5
📞 Outside Canada: 1 (800) 486-4328 | Within Canada: 1 (204) 633-1999
📧 Sales@hermannelson.com
🕒 Mon – Fri: 8:00am – 4:30pm CDT
Aerotech Herman Nelson: Built in Canada, Delivered Worldwide.
