Resetting your boiler can often resolve minor faults or restore hot water after a pressure drop or power cut. In this article, we’ll show you how to reset your boiler safely, when it’s appropriate, and when you should call a Gas Safe engineer instead.
🔍 When Should You Reset a Boiler?
- After a fault code appears on the display (e.g. F28, F75)
- If your boiler has locked out due to a power cut
- When there’s no hot water or heating, but the pressure is correct
- After topping up pressure via the filling loop
⚠️ Only reset your boiler once or twice. Repeated lockouts indicate a deeper issue.
🛠️ How to Reset Your Boiler (General Steps)
Every boiler model is different. Always check the manual, but here’s a general guide:
- 🔄 Locate the reset button – usually on the front panel or under the flap
- ⏱️ Press and hold the reset button for 5–10 seconds
- 🟢 Wait for the boiler to restart – it may take a few minutes
- ✅ Check if the fault code disappears and heating/hot water resumes
Example: Vaillant and Worcester Bosch boilers typically use a circular dial or button with a reset icon.
⚠️ Safety Tips Before Resetting
- ❌ Do not reset if you smell gas, hear banging, or see leaks
- 🔌 Ensure there’s no ongoing power fault or water pressure issue
- 📘 Read your boiler’s user manual for specific instructions
- 🔥 If your boiler shows a flame failure, seek professional help
📞 When to Call a Heating Engineer
If your boiler:
- Shows the same error after reset
- Keeps losing pressure
- Makes loud noises or leaks
- Has a failing PCB or ignition issue
…it’s time to book a visit with a certified Gas Safe engineer.
📞 Call 0779 559 5757 or
🔧 Request a Free Quote
🧰 Related Articles You Might Find Helpful
- 🔧 No Hot Water? Common Causes and How to Fix It
- 🔥 Common Boiler Fixes You Can Try Yourself
- 🧠 How to Know If Your Boiler Needs Replacing
❓ Frequently Asked Questions
🔹 Is it safe to reset my boiler myself?
Yes — if there’s no sign of a gas leak, water leak, or unusual noise. Always read your boiler’s manual first and reset only once or twice.
🔹 How do I know where the reset button is?
Most modern boilers have a reset button on the front panel, often marked with a circular arrow or ‘R’. If unsure, consult the user manual.
🔹 My boiler reset but still isn't working. What should I do?
This usually means there’s a deeper fault. Repeated lockouts often indicate a faulty sensor, diverter valve or ignition failure. Contact a Gas Safe engineer.
🔹 Can resetting the boiler damage it?
No — the reset function is built-in and safe to use. But repeated resets without resolving the cause can strain internal components.
🔹 Do you offer same-day boiler repair in London?
Yes, A&C Heating and Plumbing Ltd offers same-day boiler diagnostics and repair across North and West London.