Are you wondering if there’s a fix for your faulty Ferroli boiler?

Having to deal with a faulty boiler can be stressful, especially if you depend on it for hot water, too! And trying to work out how to diagnose the problem and whether it’s actually serious or not can also be tricky.

That’s why I’ve put together this blog post detailing five of the most common faults and fixes for Ferroli boilers, so you can get an idea of what’s causing the problem and what the solution entails.

NOTE: Remember, DO NOT try to fix the problem yourself; always call a Gas Safe registered engineer.

About Ferroli boilers

Ferroli manufacture cheap budget boilers which are known to be quite unreliable, with cheap fittings that are prone to leaks after a bit of wear and tear. It’s common for homeowners to experience a wealth of fault codes flashing up on their boilers, and often have to try and decipher what’s wrong by checking the internet.

Unfortunately, because these boilers are prone to having multiple faults at a time, many engineers (including us) will often refuse to carry out repairs. Ferroli also don’t have their own dedicated engineers, and instead use local contractors who may not have a high expertise level of dealing with this brand.

Fault 1: The boiler is leaking from below

If water is leaking from your boiler from below, it could be a problem due to this brand’s cheaply manufactured shut valves, as these boilers are prone to this particular fault.

The Fix: Unfortunately, the only solution is to have the valves replaced by your chosen engineer. However, they are only sold as a pack which costs over £120 at trade price, so it could be an expensive fix!

Fault 2: The boiler is losing pressure

If your Ferroli boiler is losing pressure, but you’ve checked there are no leaks coming from the radiators and no water discharging from the pressure relief valve, it’s usually a problem with the expansion vessel which will need to be repressurised.

The Fix: An engineer will normally use a foot pump or hand pump to repressurise the vessel – it’s usually a quick fix, but with this brand you may require a replacement vessel first – as again, they are quite cheaply manufactured and and are prone to fail early in the boilers life

Fault 3: Heating behaving erratically

By ‘erratically’, I mean that your heating either isn’t coming on at the time you’ve set, or just coming on at random times that seem completely out of your control and make little sense (think 3am).

The Fix: The cheap mechanical timers that were often installed in Ferroli boilers tend to be very flimsy and often break if someone tries to turn the timer back. It should be fairly simple to replace the programmer.

Fault 4: Boiler not firing/Going into lock-out

If your boiler is failing to fire up and just going into lock-out, it could be a problem with the PCB (printed circuit board), but you can check this by testing with a vault meter to see if electricity is reaching the PCB whilst still remaining unresponsive.

The Fix: Often, the only solution here is to have the PCB replaced, which can be costly.

Fault 5: Boiler igniting briefly or ‘puffing’

If your Ferroli boiler is only igniting briefly, or making a ‘puffing’ sound, this is usually down to flue problems, such as corrosion in the flue duct, or joints coming lose.

The Fix: Get an engineer to replace your flue or clamps holding the flue in place.

Consider a replacement

Especially if your Ferroli boiler is old, it may be worth considering a replacement boiler. Spare Ferroli parts tend to be very expensive, and the boilers themselves are unreliable and prone to multiple faults, so even if you fix whatever’s wrong now, you may find the boiler breaking down again in a couple of month’s time.

Upgrading to a new, A-rated boiler from a more reliable brand could save you a lot of money in the long-term, although you may see it as a bit of an investment in terms of upfront cost.


I hope you’ve enjoyed reading, and by now you should have a better idea of how to diagnose your faulty Ferroli boiler – just remember to call an experienced gas engineer and do NOT try to fix these issues yourself.

Are you struggling with a problem regarding your Ferroli boiler that I haven’t mentioned above? Either leave a comment below or get in touch with me directly – I’ll be happy to help!