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Just for info: Having traced all the wiring it's plain to see that the controller wasn't originally wired to enable the HW & CH to work independantly. Just thought i'd post this in case it helps anyone else with similar issues... many thanks to peeps that assisted in suggestions.... Ian

I mentioned that the issue was 2 fold..... 1. Dodgy controller wiring. 2. Heating not being controlled by thermostat. Issue 2 has now been resolved !! It turned out that the mid position valve wasn't performing correctly i.e. it was opening/closing the valve as per thermostat...

...and just like elderly parents do.... they produce the boiler's installation manual which has been gathering dust and forgotten about :roll: I'm hoping that with the boiler wiring diagram & controller wiring diagram i can suss it out.... Many thanks for the input chaps! :D

Just for clarification - This is a single terminal block connector inside the controller. There is a wiring centre up in the airing cupboard as per previous post..

Thanks very much for taking the time to post that information - very much appreciated! (Been looking all over t'internet for a pic like that - thank you!). The problem i have is actually trying to determine where the other ends of the wires are! :lol: No doubt the right person with the...

Thanks for the responses... :) OK... i've checked out the wiring for the controller and it's definitely NOT wired as per the instructions for a fully pumped system and can see that by selecting DHW 'only' wouldn't actually do anything as there's no wiring to the controller to call for HW...

Unsure of what you're pointing out re: Interlock... ? Isn't this purely for the benefit of gravity systems? The switches aren't interlocked but yes i did interlock them just to see if it made a difference - unfortunately not.. Apologies if a dip switch = interlock...in IT it's something...

Sorry, i may have mislead you when i stated "After confirming that the controller is wired up correctly" .. i meant that i WAS going to check it and then carry out the other steps...(haven't done so yet) Have just checked the installation manual of the controller and there's no mention of any...

Hi Folks, My parents have a heating system as follows: (Fitted by British Gas). Ideal Mexico Super 2 RS50 Horstmann Tiara H425 controller Room stat Fully pumped system 3 way mid position valve Their issues appear to be 2 fold. 1. Ever since this system was fitted the DHW was...