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Thanks to Owain and Boilerman for your help. I have enough information to go away and draw out the wiring needed to replace my Coronet. I like a challenge!

There are two switches on the Myson one for central heating that will only work if the hot-water switch is on but you can have just the hot water switch on. These switches are on the casing face plate of the boiler. The Coronet only controls the time. In the summer I have it on 24 hours and just...

I have to thank you Owain for your patience but hopefully one last question? I realise now that it would have helped you if you had all of the information on my first question. A combi boiler? Pass. I have a Myson Velaire PJ 50/70 Pressure Jet Oil Fired Boiler. It was working with a Horstmann...

Sorry to be a pain but when I click on the Horstmann H21XL it says it is a direct replacement for the 425 Diadem. However on checking mine I find that it is a 425 Coronet. Is this still the replacement item? Thanks

Thnks I will get right onto it

for some reason I cant follow your link but what you have recommended is just what I need. Can you tell me on here what the particular Horstmann I need to replace the 425? Is it a C27? Thanks

Hi I have a boiler that has a Horstmann 425 as the timer. This was fitted many years ago when the integral timer gave up the ghost. It works well when it works but I live in the country and prone to power cuts. After about 2 years the Horstmann will not start on its own. I replaced it about 3...