Vaillant ecoFIT Pure Problems — Faults & Fixes
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The Vaillant ecoFIT Pure is a popular, compact boiler found in many UK flats and smaller properties, and like all boilers, it can develop faults over time. Most problems show up as fault codes on the display panel — these are your boiler's way of telling you something needs attention. The good news is that many faults, particularly low pressure issues, are straightforward to fix yourself without calling an engineer. However, some faults do require a Gas Safe registered engineer to diagnose and repair safely. This guide walks through the most common fault codes on the ecoFIT Pure, what they mean in plain English, and whether you can tackle them at home or need professional help. If you ever smell gas, leave your property immediately and ring 0800 111 999 — never attempt to repair a gas boiler yourself unless you're Gas Safe registered.
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Most likely cause & what to check
The Vaillant ecoFIT Pure is a more recent and compact boiler range, introduced as a budget-friendly alternative to the ecoTEC series. It is common in smaller flats and properties. The ecoFIT Pure shares the same fault code system as other Vaillant boilers. Manuals at vaillant.co.uk or call 0330 100 3461.
Fault code F22 (low pressure): most common fault. Repressurise via the filling loop under the boiler to 1.2 bar, then press reset. The ecoFIT Pure has a clearly labelled filling loop and pressure display.
Fault code F28 (ignition failure): reset once. Check gas supply. If F28 returns, the ignition components need inspection by a Gas Safe engineer. The ecoFIT Pure is a newer design with a slightly different ignition assembly to the ecoTEC — make sure any engineer is familiar with the range.
Fault code F75 (pressure sensor fault): less common than on the ecoTEC Plus, but still occurs. The pressure sensor can fail independently of the actual system pressure. A Gas Safe engineer can test the sensor with a multimeter and replace it if faulty.
General reliability: the ecoFIT Pure is a relatively new model and early feedback has been positive. It is an A-rated boiler but has slightly fewer features than the ecoTEC Plus — it does not, for example, have a built-in bypass valve, which means system design matters more.
Vaillant offer up to 7 years' warranty on the ecoFIT Pure when registered within 30 days of installation. Visit vaillant.co.uk to check your warranty status.
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Frequently asked questions
What does fault code F22 mean on my Vaillant ecoFIT Pure?
F22 indicates low pressure in your heating system — the most common fault on this model. Your boiler won't fire up or will keep shutting down when pressure drops below the safe operating level (around 1 bar). You can usually fix this yourself by topping up the system using the filling loop located under the boiler until the pressure gauge reads 1.2 bar, then pressing the reset button.
Can I fix low boiler pressure myself, or do I need an engineer?
If you have an F22 fault, you can safely repressurise the system yourself using the filling loop — it's a five-minute job requiring no special skills or tools. However, if the pressure drops again within a week or two, there's likely a small leak somewhere in your pipework or radiators, and you'll need an engineer to locate and fix it to prevent recurring faults.
What should I do if my boiler shows fault code F28?
F28 means your boiler isn't igniting — the spark plug or ignition circuit isn't working. Press reset once and check your gas supply is switched on at the meter and isolation valve. If F28 returns immediately, the ignition components need inspection by a Gas Safe engineer, as the ecoFIT Pure has a different ignition design to older Vaillant models.
How long is the warranty on an ecoFIT Pure, and does it cover fault codes?
Vaillant offers up to 7 years' warranty on the ecoFIT Pure if you register it within 30 days of installation — most faults during this period will be covered at no cost. You can check your warranty status and registration on the Vaillant website; always register promptly to protect yourself.