An F1 fault is caused by low pressure in the central heating system with Ideal logic boilers.
When the pressure is too low the boiler won’t work at all so you’ll have no heating or hot water.
Using the reset button or switch has no effect on low pressure faults. The fault can only be cleared by increasing the pressure.
Check the pressure by using the pressure gauge. On older models it is hidden under the boiler on the left. On more modern versions it is on the front of the boiler.
The pressure is increased using the filling loop. On most Ideal logics this is built in under the boiler on the right hand side. Before starting make a note of the positions of the valves. When you are finished return them to the original position.
Turn the left hand blue valve toward you. Next slowly turn the right hand valve toward you until you can hear water running. Carefully watch the needle on the pressure gauge go up. When it gets between 1 and 1.5 turn the right hand back to where it was and do the same with the left hand valve.
The F1 fault should be clear now. If the pressure is between 1 and 1.5 and the boiler still has an F1 fault the pressure sensor may be faulty which requires a gas safe engineer to repair it.
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