Ideal boiler F1 fault code

Ideal Boiler F1 Fault Code

The Ideal boiler F1 fault code indicates low pressure, so you must repressurise your boiler to fix it. You first need to check the pressure gauge and if it’s low, repressurise it until it’s at 1 to 1.5 bar.

I have been fixing boilers for over 10 years and this is how I fix an Ideal boiler F1 fault code most of the time.

It could be other problems causing the F1 low water pressure fault code, but a leak is by far the most common reason for your boiler pressure dropping. To check this, you must repressurise the boiler, then it should start working again.

The Ideal boiler F1 fault code should disappear when the boiler is repressurised, and you should hear the pump start to circulate the water in the boiler.

How to Reset an Ideal Boiler

The first thing I would check on an Ideal boiler that is not working, no matter what fault code is showing, is to check the pressure and reset the boiler.

Knowing how to reset an Ideal boiler is the simplest way to get your boiler working again, as it might have just locked out.

To reset an Ideal boiler, you must turn the right-hand knob clockwise as far as it will go and hold it there for a few seconds, then release it.

Ideal Boiler F1 Error Keeps Happening

If your boiler keeps losing pressure, showing F1 and going to lockout, then you most likely have a leak on the boiler or central heating system which needs to be fixed.

Or, if you have bled a radiator, then the pressure will drop and the boiler needs to be repressurised.

If the boiler pressure is dropping straight away after repressurising, then you must have a serious leak or an open-ended pipe on the central heating system. This will need to be found and fixed to get your boiler working again.

How to Repressurise an Ideal Boiler

To repressurise an Ideal boiler, you must find the filling loop. If it’s a built-in filling loop, it will be two blue or black handles under the boiler. Both handles must be turned to open and then closed when the pressure reaches 1 to 1.5 bar.

If it’s an external filling loop, it will probably be on two of the pipes under the boiler. It will most likely have two valves with black handles and a flexible hose connecting them together.

You must open both valves to repressurise the boiler, then close them both when it is repressurised.

You should be able to hear the water filling the central heating system when both valves are open, if not, then the filling loop might have problems or the house’s mains water might be turned off.

Other Causes for Ideal Boiler F1 Fault Code

Other causes for the Ideal boiler fault code, if it’s not low water pressure, could be:

  • Pressure sensor
  • PCB

Ideal Boiler F1 Fault Code FAQs (Frequently Asked Questions)


Why Does My Ideal Boiler Keep Losing Pressure?

Your Ideal boiler keeps losing pressure because you most likely have a leak on your central heating system, which could be at the boiler.

Another reason your Ideal boiler keeps losing pressure could be an expansion vessel problem, or the pressure relief valves might be letting by.

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