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Last week I was asked to do a few jobs at a Day Care Home. One of the jobs was to look at why they can only get cold, or at the very best tepid, water from some of the hot taps. The problem taps are on 4 washbasins and a bath which I discovered are all fitted with adjustable TMVs. I think they...

Thanks guys, that's a definite "No" then. Looks like I'll be extending the pipework on the outside of the skirting board.

Hi, Someone has asked me to move a radiator and fit a TRV. Actually they've asked me to fit a new radiator the other side of where the pipes come out of the skirting board, but that's not the problem. The problem is that the existing radiator has a single valve arrangement (non-TRV) at one...

Thanks Big Spark, but I'm still confused. Is the white flying lead type the DC sensing type? Is this what I call the "old" type that relies on a good connection to earth and measures the current flowing to earth? (This is the type that was originally fitted in my house, 80mA I think in a...

I know how an RCD works (at least I thought I did); a toroid with 3 windings, one connected to the live, one to the neutral and the other, which detects an imbalance between the first two, connected to the tripping circuit. My question is, if the RCD works purely on the principle of imbalance...

About 2 months ago I installed 2 sets of low voltage downlights in 2 completely seperate locations. One set consists of 9 transformers and lights and the other set has 6 transformers and lights. i.e. Each light has its own individual transformer. I purchased the transformers (and lights/lamps)...

Sorry it has taken me so long to get back to you ChrisR and pf_mills but I've just been so busy! You were spot on ChrisR, there was no wire from HW OFF on the programmer to Terminal 7! I had to take up the floorboards on the landing yesterday and run a new cable from the terminal box in the...

Thanks for your help Chris and pf_mills. Now that you point it out Chris, it's obvious that the valve should open the full 30 degrees (not the mid-point position as it is doing) when CH only is selected without DHW. Duh! It's the same position as when DHW is selected but the cylinder stat has...

Thanks for the information Chris. I've been back to the house today and discovered they had already had the complete diverter valve assembly changed about a month ago. I needn't have bothered changing the powerhead after all! However, the problem still exists. Like you, the customer thinks it is...

I have a problem with a heating system. The central heating works OK but only when the hot water is also on. When the hot water is off, the pump stops. Somebody else has changed the programmer unit and the wall thermostat but this didn't fix the problem. I think the problem is something to do...