Ten Checks Before the First Frost: A Facilities Manager's October Audit

Every January, our call-out logs tell the same story. Boilers that locked out on the coldest morning of the year. Condensate pipes frozen solid on roof-level plant. BMS schedules still running on summer timeclocks, heating empty floors at midnight. Almost none of these failures were unpredictable — they were simply never checked in time.

Autumn is the make-or-break window for commercial buildings. Once the frost arrives, every defect becomes an emergency, and every emergency costs more than the maintenance visit that would have prevented it. Here is the ten-point checklist we recommend every facilities manager and landlord completes before October ends.

1. Boiler Sequence Testing

Multi-boiler installations rely on lead-lag sequencing to share wear evenly and maintain efficiency. Run the full sequence: confirm each boiler fires, modulates and rotates correctly. A standby boiler that fails silently in September becomes a no-heating call-out in December.

2. BMS Timeclock and Schedule Audit

Clock changes, seasonal setpoints and occupancy patterns all shift in autumn. Audit every timeclock, optimum start/stop setting and frost protection schedule. Check that holiday overrides from the summer have been cleared — a surprisingly common source of wasted energy and complaints.

3. Frost Protection Settings and Trace Heating

Verify that frost stats and BMS frost protection loops are set and functioning. Confirm that trace heating on exposed pipework, roof-level runs and external plant is energised and monitored. A failed heat trace cable is invisible until the pipe splits.

4. Condensate Line Protection

Condensing boilers discharge acidic condensate, and external condensate runs freeze readily. Insulate, trace-heat or re-route vulnerable sections. A frozen condensate is the single most common boiler lock-out we attend each winter.

5. Roof-Level Ductwork and AHU Inspection

Check AHU belts, bearings, dampers and door seals. Confirm weather louvres are clear, that bird and insect mesh is intact, and that any ductwork insulation on the roof is dry and secured. Water ingress into ductwork is a winter-long problem that starts with one autumn storm.

6. Pressurisation Units and System Pressure

Check sealed system pressures, expansion vessel pre-charge and pressurisation unit operation. Systems that slowly lose pressure through autumn are announcing a leak — find it while the weather is mild.

7. Controls and Zone Valve Verification

Drive every motorised valve and actuator end-to-end. Actuators that stick after a summer of inactivity will fail on demand. Verify that zone controls respond at the BMS and at the point of use.

8. Filter Changes and Airflow Balancing

Replace AHU and FCU filters ahead of the heating season. Dirty filters increase fan energy, reduce heat delivery and push systems harder than they need to work. Confirm design airflows where spaces have been reconfigured during the year.

9. Legionella and Water Hygiene Review

Autumn shutdowns and low-occupancy periods create stagnation risks. Confirm temperature monitoring is current, flush little-used outlets, and check that cold water storage and calorifiers remain within compliant parameters under your L8 regime.

10. Emergency Plan and Documentation

Finally, confirm that your emergency call-out arrangements are live: contacts current, plant room access arrangements clear, and as-installed drawings and O&M manuals findable at 3am. The best-maintained building still needs a competent response when something fails.

The Window Closes Quickly

None of these checks is exotic, and most can be completed in a single structured visit per building. What matters is that they happen before the first hard frost, when a two-hour inspection is still a maintenance task rather than a crisis.

Print the list, book the visits, and treat October as the deadline it genuinely is. Your January self — and your tenants — will be grateful.