My central heating boiler has gone off (no power) and the book asks if there is 240v present at the boiler. Would you recommend i use my multimeter to do this ? I don't really want to phone an electrician out if its simply a fuse to replace, The fuse in the spur is ok but don't really want to open the boiler up to check other fuses unnecessarily. Ta in advance for any advice. P.S. I'm not at home at the moment so its not an emergency.
voltage check
- Thread starter dweeble
- Start date
Your multimeter is just the tool you require. Set it to AC voltage and measure between L/N, N/E, L/E. You should get around 240v on the first and last.
Bear in mind that when you open the fitting it is live. It would also be wise to test your multimeter on a known working circuit first to make sure the multimeter is working.
Is the boiler on it's own circuit ? if so check mcb / fuse at board.
If it's a spur off a ring, does the rest of the ring circuit still work ?
Have you tried changing the spur fuse (having checked it's a good un with the meter via continuity) ?
If you feel safe to work live and understand the risks, having sorted out the above you could check for L & N at the load and supply side of the spur. If they both work, then check the boiler.
If it's a spur off a ring, does the rest of the ring circuit still work ?
Have you tried changing the spur fuse (having checked it's a good un with the meter via continuity) ?
If you feel safe to work live and understand the risks, having sorted out the above you could check for L & N at the load and supply side of the spur. If they both work, then check the boiler.
Prob the 20mm fast blow fuse has blown inside the boiler.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
