F28 may indicate failed ignition, interrupted gas supply or flame-sensing trouble. Learn safe first...
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E03 can relate to flue, fan, air pressure switch or combustion-air safety. See safe next steps and w...
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E02 may indicate overheating and safety protection in a boiler. Learn how pump, filter, circulation...
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E10 often points to low heating system pressure. This guide explains the pressure gauge, hidden leak...
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E01 or A01 usually appears when the boiler cannot ignite and locks itself for safety. Learn the safe...
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Humming, knocking or water sounds from a combi boiler may be caused by air, pump strain, limescale,...
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Flue, air pressure and combustion safety error codes can indicate a serious boiler safety issue and...
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If the boiler runs but radiators do not heat properly, the cause may be trapped air, circulation, ba...
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If shower or tap water keeps switching between hot and cold, the cause may be flow sensing, a divert...
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