Recent content by DR_Smith

Thank-you Ian. I have spent many hours checking the wiring, watching youtube videos and will test over the next few days, but your give away one liner has largely answered the question!!!! It would seem though it is only a part of the problem. I am guessing the ball inside maybe partly...

A side question please. :-) In checking the wiring some cables are buried in the wall and I can't see the back of my boiler (installed circa 1982). As far as I can tell, there is only one power cable to it, a switched live, whereas most Y plan diagrams show a switched live and a permanent live...

Ian. I have found youtube videos on pressure relief valves but nothing for restrictive valve, apart from passing reference in one video, that said they should be on the output side. Mine is on the input side, which I would have expected to be right - if it makes any difference at all. I could...

There is a valve there, top looks like a bleed point for air. I am familiar with concept, but don't know how to adjust them and what I am aiming for. I have a shower that can use HW at high rate, so wouldn't want to compromise that. You have hit on something good there!!! Any tips on how to...

Thank-you Jackthom. I have a multimeter and a printed off the web the expected voltages for each position. I was hanging back from testing with multimeter in case I accidentally shorted something, as don't want to be without heat whilst freezing outside. Multimeter has setting for 200 and 600...

Thank-you Ian. I can confirm there is a HW OFF cable from Programmer to TB7 then green to cyl stat and grey to valve. I have pics, not sure if it will help as been same since house built around 1982. All as per standard Y plan except pump is not via boiler over-run (checked with Boiler m/f that...

Thank-you DP. I have checked the wiring is as per Y diagrams and all corrrect. Awake in the night trying to make sense as it is non-sensical. If motor will turn CH off it must be working, so at a loss why it won't move into CH only position. I have read gearbox can go but don't hear any noises...

After further investigation I believe I have a problem with 3 port valve on the Y plan. If programmer is set for HW + CH, that works fine, I have HW and CH. If room stat is turned down, radiators cool, as expected. (Does this alone mean 3 port valve motor is working?) If room stat turned up...

Update. Spoke to a heating engineer over the phone. It seems I am perhaps assuming the programmer is more intelligent than it is and if programmer won't display CH with HW off, then either it is in the 10 program gravity mode not 16 program pumped mode, or it is a problem with the programmer...

Hello, First post :-) I have Y plan system for CH and HW via 3 port valve, Honeywell 4073, pump on its input side. The CH works whilst HW is on at programmer (Potterton EP2000), but CH does display or work when HW is off at programmer, even if room stat is calling for more heat. It has been...