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Welcome to our ‘How-To’ video series!
Boiler getting too hot
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- Check the thermostat and make sure it is set properly, not too high. Lower it to an appropriate temperature.
- Inspect the high limit switch and make sure it is functioning properly to shut off the boiler if overheating occurs.
- Test the thermostat sensors with a multimeter. Replace any faulty sensors giving incorrect high temp readings.
- Check for restricted water flow due to closed valves, clogged pipes, or a stuck circulator pump. Open all valves and clear any obstructions.
- Bleed radiators and baseboards to remove trapped air that can impede water circulation and lead to overheating.
- Clean heat exchanger surfaces if scale buildup is present, reducing efficiency and heat transfer.
- Inspect burner nozzle size and flame for proper combustion. Adjust fuel/air mixture as needed to prevent overfiring.