Can I fix Ideal F1 myself?

Easy (About 15 minutes). 1. Read the pressure gauge: On the Logic Combi it's on the far left of the boiler. Ideal says it should read between 1 and 1.5 bar. 2. Top up with the filling loop: To between 1 and 1.5 bar, following the steps in your user guide. Call an engineer: If the pressure keeps dropping, call a Gas Safe registered engineer. Ideal says pressure that keeps falling can mean a leak, and needing to top up often means the system needs checking.

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IDEALBOILER

Ideal · Boiler

Ideal F1 error code

Q: Is Ideal F1 worth repairing?

Usually free. Topping up costs nothing. If you have to do it often, there's a leak or a worn part for an engineer to find.

Water pressure too low

The water pressure in the heating system is too low. Ideal says it needs topping up to between 1 and 1.5 bar.

What to check

Worth repairing?

Usually free

Topping up costs nothing. If you have to do it often, there's a leak or a worn part for an engineer to find.

Can you do it yourself?

Easy

About 15 minutes

Before you start

Never take the boiler's cover off. Anything inside is a job for a Gas Safe registered engineer.

What to check, in order

Read the pressure gauge
On the Logic Combi it's on the far left of the boiler. Ideal says it should read between 1 and 1.5 bar.
Top up with the filling loop
To between 1 and 1.5 bar, following the steps in your user guide.

When to call a Gas Safe engineer

If the pressure keeps dropping, call a Gas Safe registered engineer. Ideal says pressure that keeps falling can mean a leak, and needing to top up often means the system needs checking.

Good to know

Ideal says a system that has just been filled can lose some pressure as air works its way out.

Checked against

Last reviewed September 2026. Manufacturers update their pages, and your manual is the final word.