Top 7 Common Heating Problems and How to Fix Them

When winter hits London, the last thing you want is a heating system failure. Yet, many homeowners encounter common heating problems that can leave them cold and frustrated.
Understanding these issues — and knowing how to fix them — can save you time, money, and stress.

Here’s a guide to the top 7 most common heating problems and what you can do about them.

1. Radiators Are Cold at the Top or Bottom

Problem:
Radiators that are hot at the bottom but cold at the top usually have air trapped inside.

Fix:
Bleed your radiators using a radiator key to release the trapped air. If the problem persists, it might be a circulation issue requiring professional help.

2. Boiler Keeps Losing Pressure

Problem:
Low pressure affects your heating system’s efficiency and can lead to no heating or hot water.

Fix:
Check the pressure gauge. If it’s below 1 bar, top it up using the boiler’s filling loop. Persistent low pressure could indicate a leak or expansion vessel issue.

3. No Hot Water or Heating

Problem:
This could result from several issues: faulty motorised valves, broken thermostats, airlocks, or even low pressure.

Fix:
Reset your boiler first. If that doesn’t work, it’s time to call a qualified heating engineer.

4. Strange Noises Coming from Boiler or Pipes

Problem:
Banging, whistling, or gurgling sounds usually suggest kettling (limescale build-up), trapped air, or pump failure.

Fix:
Bleeding the system can help, but a power flush might be needed if limescale has built up significantly.

5. Pilot Light Keeps Going Out

Problem:
A pilot light that won’t stay lit often points to a broken thermocouple, a faulty gas valve, or draughts blowing out the flame.

Fix:
Do not attempt to fix gas issues yourself. Call a Gas Safe registered engineer immediately.

6. Thermostat Problems

Problem:
Incorrect thermostat settings, aging devices, or battery failures can all cause heating system malfunctions.

Fix:
Replace old thermostats with modern, programmable models. Smart thermostats offer better control and efficiency.

7. Heating System Cycling On and Off Too Frequently

Problem:
Short cycling stresses your boiler and increases energy bills. Causes could be low water pressure, thermostat issues, or a failing pump.

Fix:
Schedule a professional inspection to identify and resolve the root cause.

Why Choose A&C Heating and Plumbing Ltd?

At A&C Heating and Plumbing Ltd, we specialise in diagnosing and fixing heating problems across North and West London, including heating services in Ealing, heating repairs in Islington, and more.

✅ 24/7 Emergency Heating Repairs
✅ Gas Safe Certified Engineers
✅ Fast Response Times
✅ Transparent Pricing with No Hidden Fees

Learn more about our Heating Services in London

Need Help with Your Heating System?

Don’t wait until a minor problem turns into a major breakdown.
Contact A&C Heating and Plumbing Ltd today for fast, professional heating repairs.

📞 Call us at 0779 559 5757
📧 Request a quote online

Frequently Asked Questions About Heating Problems