Boiler frequently cycles on and off in short intervals during heating demand.

Safety: Normal operation involves some cycling, but rapid cycling can damage components.

• 1. Check thermostat location: Ensure room thermostats are not near heat sources or drafts that cause rapid temperature swings.
• 2. Adjust settings: Review Noritz boiler control parameters (if accessible to user) for minimum run time or differential settings; consult manual.
• 3. Increase system volume: If the system has very little water volume (e.g., small radiant zones), discuss adding a buffer tank with your installer.
• 4. Professional review: A heating professional can evaluate boiler sizing and control strategy to reduce short cycling.