What is likely happening
Rapid on-off cycling wastes fuel and wears components. Common causes are an oversized boiler, poorly set controls, a failing sensor, or low flow through the system.
What you can safely check
- Time a few cycles and note how long the burner runs each time.
- Check thermostat and control settings for recent changes.
What an inspector will look at
- Control settings and sensors
- Flow and circulator operation
- Boiler sizing versus load
- Combustion check
Does this affect compliance?
Short cycling is not a violation on its own, but it often shows up alongside control defects noted at inspection.
When it becomes urgent
More urgent if cycling comes with lockouts, noise or pressure swings.
We can help with this
Boiler inspection is something Insparisk does nationwide. To see the local rules for your building, open this in the interactive Problem Solver.
Request boiler inspectionTalk to an advisorGeneral guidance only, not a substitute for a licensed inspection or emergency services. For any gas odor, carbon monoxide alarm, fire, or trapped occupant, call 911 first.