What's your boiler's display telling you?
Fault codes, fixes and heating tools for UK boilers, checked against the manufacturers' own manuals.
Worcester Bosch
Type the code from your boiler's display.
Dots and spaces don't matter. Press Enter to open the top match.
No code showing? Start from what it's doing.
Heating calculators
BTU/hRadiator size calculatorHow much heat a room needs, in BTU and watts, and what radiator to buy. Allows for heat pumps and low flow temperatures.kWWhat size boiler do I need?The kW size manufacturers recommend for your home, and whether a combi suits it.barPressure checkerMove the needle to match your gauge and see what your boiler's maker says to do.£ savedWhen to turn the heating onWhat starting later or switching off earlier saves this winter, from Ofgem and government figures.p/litreHeating oil quote checkerTurn any oil quote into pence per litre and compare it with the latest survey average.Does my oil tank need a bund?Tick what's near your tank to see what the rules say.
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Each brand's recommended pressure when the system is cold, from its own guidance.