Burnham
Insufficient Boiler Output or System Capacity
Boiler takes a very long time to heat the house, or cannot reach set temperature on cold days
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Boiler undersized, Burner not firing at full input, Incorrect water temperature settings, Flow too low through emitters
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting internal controls.
- Check boiler firing rate: Ensure the burner is firing steadily and not short cycling or locking out.
- Verify temperature settings: Confirm the high limit or setpoint is appropriate for your system (often 180–200°F for baseboard).
- Inspect circulators and valves: Make sure all zones that should be heating are getting flow and that pumps are sized correctly.
- Consider outdoor reset adjustments: If using outdoor reset, the curve may be set too low; consult the manual or a technician to adjust.
- Have a heat loss evaluation done: A professional can determine if the boiler is properly sized and if system upgrades are needed.
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Repair Difficulty
Medium
3/5
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