😩 What Actually Goes Wrong with Boilers (And What You Can Do About It)

Let’s be honest – nobody thinks about their boiler until it decides to pack up on the coldest day of the year. And when it does go wrong? Panic mode. Cold showers. Kettle baths. Blankets layered like lasagne.

So, let’s take a chill look at what typically goes wrong with boilers – and how you can stay one step ahead (or at least know what you're looking at when your heating engineer throws out a word like "diverter valve").

💨 1. No Heat or Hot Water

Likely Culprit: Broken motorised valve, thermostat issues, or low pressure.
Fix Vibe:

First, check the pressure gauge (should sit around 1–1.5 bar).

If it’s too low, you might need to top it up using the filling loop.

Still cold? Could be the valve or a faulty sensor – both are easy swaps if you know what you're doing (or have us on speed dial).

🔁 2. Radiators Are Only Warm at the Bottom

Likely Culprit: Sludge. Yes, actual sludge.
Fix Vibe:

Bleed your radiators – it’s oddly satisfying.

If that doesn’t help, it might be time for a power flush or a filter install. We stock magnetic filters that keep future sludge at bay.

🔥 3. Boiler Keeps Turning Off

Likely Culprit: Low pressure, thermostat, or a dodgy pump.
Fix Vibe:

Top up the pressure first.

Still switching off? Your pump might not be pushing water properly – we’ve got replacements for most brands in stock.

💧 4. Leaks

Likely Culprit: Worn washers, cracked seals, or rusted components.
Fix Vibe:
Leaks never fix themselves. Identify the source and replace the part before it leads to bigger problems. If you need a hose, valve, or fitting – chances are we’ve got the exact one you need (and we’re happy to help you find it).

💡 A Little Tip From Us:

Always keep your boiler manual handy (or at least take a photo of the label with the model number). It makes everything easier when you're trying to find the right part – or when you're ringing us with a “Do you have one of those things that goes into the other thing?” kind of question. We’ve heard it all, and we’ve got you.

🤝 We're Here for the "Oh No" Moments

At Heating-Parts.co.uk, we’re not just about boxes and barcodes. We’re a real team that deals with real heating problems – just like you. So whether you're a seasoned engineer or a DIY warrior, we’ve got your back.

Need a hand finding a part? Or just want to rant about your boiler's latest breakdown?
📞 Give us a call.
📧 Or drop us a message.
🚚 And if you order before [insert time], we’ll get it out to you next working day.

Until then – stay warm and may your radiators never gurgle.

Published on 04 April 2025