Rooftop unit basics for office managers — belts, filters, drains

What this error means

The unglamorous truth about the machine on your roof: the failures that actually take offices down are cheap parts nobody checked. A worn $30–$60 blower belt that snaps means no airflow — and can cascade into a $3,000–$8,000 compressor failure. Clogged filters and dirty coils show up in field studies as inadequate airflow in 40–70% of units. Clogged condensate drains announce themselves as ceiling stains and roof leaks. Quarterly PM on these three items prevents the large majority of emergency calls.

Symptoms

• Weak or no airflow (belt or filters)
• Ceiling stains below the unit (drain)
• Rising energy bills (dirty coils, failed economizer)
• Squealing from the roof (belt)

Try this first (safe DIY steps)

1. What you can do from inside: change accessible filters on schedule and log airflow complaints with dates — patterns are diagnostic gold
2. Put the unit on a quarterly PM contract that explicitly includes: belt inspection/replacement, coil cleaning, drain clearing, and an economizer function test
3. Use our Maintenance Budget tool to sanity-check the PM quote

Safety: power off before any physical intervention. Never bypass covers or interlocks — fuser areas run hot enough to burn.

When to call a technician

All rooftop work is professional territory (roof access + refrigerant). Typical items: belt ~$100–$300 installed, contactor $200–$450, capacitor $100–$250; commercial service rates run above residential.