How can I fix my Main Mersey multipoint water heater?
I have an old Main Mersey water heater that has worked well for years
It hasn't been used since January and today I turned the gas back on, lit the pilot, and ran the tap.
It fired up nicely but when I turned the tap off the boiler kept burning!
I turned the main gas tap off, waited a few minutes and tried again. Same thing
Steve, July 2008