🔧 1. Check the basics first
- Make sure the power supply is on (wall switch or fused spur near the boiler).
- Ensure gas supply is on (if it’s a gas boiler).
- Check that the pressure gauge is in the normal range (usually 1–1.5 bar when cold).
🔘 2. Turn on the boiler
Most boilers have:
- A power button or switch → turn it ON
- A control panel or dial → set to heating or hot water
If you have a thermostat:
- Turn the room thermostat up so it calls for heat.
If you have a programmer/timer:
- Set it to “ON” or “AUTO” with the correct time.
🔥 3. Ignite (if needed)
- Modern boilers ignite automatically.
- Older boilers may require pressing a pilot light or ignition button.
🌡️ 4. Set temperature
- Heating: usually 60–75°C
- Hot water: around 50–60°C
⚠️ 5. If it doesn’t start
- Check for an error code on the display.
- Press the reset button (only once or twice).
- Make sure pressure isn’t too low (below ~1 bar).
🚫 Safety tips
- If you smell gas → do NOT turn anything on, leave the house, and call emergency services.
- Don’t open the boiler casing unless you’re qualified.
- If unsure, contact a Gas Safe registered engineer (required in the UK).
👍 Quick question for you
What kind of boiler do you have (combi, system, or conventional—and brand if you know it)? I can give you exact steps for your model.