Vaillant F22 Boiler Fault & How To Fix It

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Keeping your Vaillant boiler in tip-top condition is an important part of keeping your heating on and hot water running. Most modern Vaillant boilers are smart enough to communicate a problem quickly, and the error codes can be a useful way for you to identify an issue, and figure out the best next steps.

A F22 error code is a common problem, and means that the water pressure on your boiler has fallen, and that it needs to be increased before the system will run again. Its the same as a F1 Error on an Ideal Boiler, but different from the F75 Boiler Fault.

In some cases, the boiler will lock out when the pressure drops to a certain temperature; this means that your hot water and central heating systems will fail to work until the issue is resolved.

What Causes An F22 Error Code?

As we mentioned, an F22 error code is caused when the water pressure of your boiler drops below a safe level. If your boiler loses pressure, it will not ignite, leaving you without heating and hot water.

If you have noticed an F22 error code on your Vaillant boiler, then your heating system (not nessesarily the boiler itself) is losing pressure.

This pressure loss can be caused by faulty components or leaks – if your boiler is losing pressure then we are here to help.

Leaks On Your Heating System

If you have noticed a sudden, dramatic drop in pressure, this is a strong indicator that the loss of pressure is down to a leak. In most cases, you should leave the repair to the experts; finding and fixing a leak can be a challenge, and it can be almost impossible to locate and rectify without access to the proper equipment or experience.

If you have noticed a sudden, dramatic drop in pressure, this is a strong indicator that the loss of pressure is down to a leak. In most cases, you should leave the repair to the experts; finding and fixing a leak can be a challenge, and it can be almost impossible to locate and rectify without access to the proper equipment or experience.

Corroded Heating Pipe Leaking

Faulty Boiler Component

In addition to a potential leak, the culprit for an F22 code could potentially be a fault with a major component within the boiler itself. Common culprits are the pump, the pump lead, or the pressure sensor. These faults may appear in conjunction with a leak, or as an independent issue, but should always be left to the experts; it is likely that the part needs to be replaced, and this should be carried out by a fully qualified engineer.

Can I Fix An F22 Fault On My Vailliant Boiler?

In some cases, it is possible to repressurise your boiler, but this should only be attempted if you are confident and after reading your Vailliant boiler manual.

Start by turning off the boiler and allowing the system to cool, before finding the filling loop – this is recognisable thanks to a valve at either end. This is attached to the system – you may have to remove end caps – before you open the valves, allowing the water to flow into the system. As this happens, the pressure rises – when it hits 1, close the valves, remove the loop, and replace the end caps.

There are a few key observations to note here; the first is that you should hear water flowing into the system when you turn the valves – if this does not happen, there could be a deeper issue, and you will need to call in a local plumbing and heating engineer. (not us, we are a specialist Leak detection company)

The final stage is to keep a close eye; if pressure continues to drop, there is a very strong possibility that there is a leak in the system, and this needs the experienced eyes of a professional engineer.

Is Your Boiler Losing Pressure Because Of A Suspected Water Leak?

Here at ADI Leak Detection, we have the skills, tools and knowledge to find hidden water leaks on your central heating system – these are quite often the cause of a F22 Fault on Vailliant boilers.

If you believe a water leak on your heating system is the cause of your Vailliant boiler giving a F22 error code then please call our team on 0800 731 3843 – we look forward to helping you.

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