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It's 13 years old and my brother (gas Safe installer) has been saying it needs replacing for at least 7 years. I suppose it has become a bit of a hobby in proving my brother wrong. :D Parts are cheap, one breakdown every couple of years costs me £20-70 to fix. It will take me a while to claw...

Where do you think the real problem might lie then? I assume that you also don't think its just a dodgy probe? Today I had the the underfloor heating running flat out (heating is in two zones) and it ran for several hours without tripping. I expect this might have reduced the return...

A bit more info. The manual says "under normal CH or DHW operation" the voltage should be 24v. What I have found is that the red and black wires that it suggests to test across have 36v DC at idle, which drops slightly to around 30-33v DC when the fan is running. There are actually 5 wires to...

Hi. Thanks for the reply. I have been measuring in DC. The manual didn't say either way, but I assumed 24v would be DC? I agree the flue is probably too hot, which is why I thought fan speed might be a factor. The pump is spinning. Central heating gets warm pretty fast (before tripping)...

Hi. I have a Biasi Riva advance 32HE. It's quite old and over the years j have become quite familiar with fixing it. This week it has been locking out with a flue temp ntc alarm. I think this must be a common alarm, as I've had it before and actually had a spare probe. With the spare probe...

DIY doesn't run that quickly in my house. I was still at the visualisation stage when I made the first post. Now I'm at the psyching myself up stage. :mad: I might start in the spring, once I can drain down the central heating. I did find that my cousin had done the same thing in his terrace...

I thought it was quite clear. Do you need some clarification?

Hi there. I have got the above rubbish boiler, it's old, but it does a job. Last week I woke up to no hot water. The diverter valve had leaked and dripped onto a zone valve and tripped the RCD. The diverter valve leak was coming from the pin which is actuated by the motor. I brought a...

Thanks - that seems so obvious. I had tried googling "imperial conduit fittings" "imperial conduit gland" etc. I've ordered a few, I'm fairly confident that they will fit.

This forum was able to help me a couple of years back identifying the thread size of some old BA screws in an old light fitting I had brought. Now I've been buying more old reclaimed lights.... This time I have some old Coughtrie bulkhead lights. I am trying to find the size of the inlet...

Thanks for the reply. Will the boiler stat cut out even though the boiler return is cold (only at the temperature of the return from the ufh, so say 30 degrees). I thought it would only cut out when the returning water approaches that of the outgoing water. If the boiler does cut out on its...

I forgot to add, there is a bypass right near the boiler in case both of the zone valves are shut and a fault occurs causing the boiler to be on. Am I being a tight arse by trying to make my boiler cycle on/off while ufh only is being called for? Could I acheive this by keeping the pipe...

Ok, thanks. Is that because of the non-return valves, or because of how the thermostatic capsule thingy inside the valve works. I've re-drawn my schematic from scratch, rather than amending someone else's. Which bit doesn't look right?

I think my first post must have been a bit confusing. I'll try and keep this brief. I have now wired this up and it is all working in terms of the timer and thermostats working the zone valves and turning on the boiler. I included a pipe stat next to my UFH mix valve. The intention was that...

This looks like a problem with the original fitting, as bobasd has pointed out the flush pipe is exiting the fitting at an angle. If not nicely square into the fitting then you are much more likely to get leaks. it may have weeped since originally fitted, or just be more prone to leaks as the...

Hi. I have a new kitchen with wet underfloor heating. I have installed 2 zones, controlled by 2 port valves. The underfloor heating is a pretty simple install, just one zone with a mixer and pump. Its not wired in yet. I want to wire it up so that it it as efficient as possible. As far as I...

Hi. thanks for the reply. There are a pair of steels beneath the first floor. I've just remembered I have proper drawings for these There is a bit of a void where these two steels are boxed in (where the four spot lights are), so this would be an easy way to run in pipes

This is a bit of building and a bit of Plumbing. I am trying to create some room to put a shower cubicle into my bathroom. I have a victorian terrace. The Bathroom is in the L shaped bit at the back. Coming up through the house I have a large chimney. It has been removed on the ground floor...

I had looked on that Wikipedia page to get the BA dimensions. I'd missed the last paragraph though!

Thanks for all the replies. I think the mystery is now solved. The screws inside the fitting which will take the lamp holder were: Major diameter 4.74mm TPI: 34 approx I reckon this is a BA2 - my TPI measurement is a bit out, but the screw I had was only about 5mm long, so there was probably...