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Many thanks for all the replies, I really appreciate all the suggestions. On the back of this, I bought a LAP trailing edge dimmer switch and some LAP 2700K GU10 LED bulbs. I've installed the dimmer switch and BINGO, got the warm light effect that I've been after. I have tried it with the...

I have ordered two different sets of GU10 LED bulbs that purport to be warm white, but both sets give off what I would describe as a stark or cool white illumination. They do not emulate the GU10 halogen bulbs I am replacing, and I am now wondering whether there are equivalents for these. The...

Many thanks. It was in the “Auto” position when I last looked. Both of them have been in operation for many years so maybe time to be replaced.

Thanks for your reply. On closer inspection, there are two of these valves, the other is a Honeywell F3-9601. The affected one is in the "Auto" position. What do they do and if it's now not working, how will this affect my heating and hot water?

During the early hours of today, this item was making a loud buzzing noise, which eventually stopped. I don't know what it is or what it does, and I don't know if the noise stopping was indicative of it now being broken. What does this do and if it is broken, how will this affect my heating...

Good points. Ultimately, I'm trying to reduce cost. I use my current dimmers to light stairs and hallway, and also my office, where I don't always need such bright light.

Thanks to everyone that replied. Appreciate your help and advice.

I want to replace these bulbs with the low energy equivalents, but do I need to change the bulb holders and do I also need to change the dimmer switch as I’ve seen there are two types of dimmers called leading edge and trailing edge, but I’m unsure what I would need. Thanks for your help.

Certainly will. Thanks.

Hi, just thought I would provide an update. Had a sparky come round this evening and, as I previously said, the arcing noise didn’t occur and hasn’t since I examined the ceiling rose the second time. The sparky checked the dimmer connections and was happy with those. He then checked the...

Although the kitchen and dining room are nearby I doubt they put the transformers outside of the kitchen. In reality I just don't know. Will update the thread when I find the answer. Thanks for all the help.

One other thought. Could faulty transformers connected to the cabinet lighting cause this?

I've checked as far as I can see and that fitting has been in place for several years as has the kitchen lighting. Yes, when I connected L1 & L2 the lights didn't come on. I thought I had a faulty dimmer but on closer inspection of the picture I took of the original dimmer and wiring I realised...

No, I'm still none the wiser. I'm going to get a sparky in.

I realised that when I changed the existing dimmer to the new one I wired it incorrectly. Instead of wiring L1 and COM (wavy line with arrow pointing) I wired L1 and L2 on both dimmers. I have now wired as per the original dimmer and whilst the lights work the arcing noise returned. Have to...

Just typical. I went to record the noise and now it isn't doing it!

I will get as near to the source as possible and will double check the connections. I hadn't considered it might be the bulbs but I'll remove one by one and see if that has any effect. Both my wife and I are convinced it's originating from the ceiling rose but it could equally be very near to it.

Hi John. I wasn't sure of the correct terminology to describe it but someone suggested it was arcing hence I used that. I'll record it later and post here. It's not a buzzing noise but crackling is a better description. The noise increases / decreases if I turn up / down the dimmer yet...

Another suggestion put to me is the transformer connected to the cabinet lights. If the transformer is faulty could this create the issue I'm experiencing? Tomorrow I will check the wiring in the ceiling rose again and try another dimmer switch. I'm still puzzled as to why the new one didn't...

I've now switched the wires around so that the dimmer controlling the spots now controls the cabinet lights and vice versa. Now when I switch on what was the spots dimmer I'm gettig the arcing whereas before I got the arcing when I activated the cabinet dimmer. This now seems that it might be a...