Combustion & gas: Boiler tips
Short, practical technician tips on combustion & gas for boiler. Check each one against the manual for your exact model before acting.
Air vent caps must be loose
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A fully tightened cap blocks venting; painted-over vents in living spaces are a common failure.
Test the LWCO by draining
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Shut makeup water, open boiler drain, burner must stop immediately; also lift the relief lever briefly — if nothing comes out, shut down and replace.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.