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Thanks for your advice, I wired up the Horstmann timer today as sugggested and all seems to be working fine so far.

Hi Please can anyone advise me. I have a Vaillant ecotec exclusive 838 pre-2012 model combi-boiler at home which is currently time controlled with a Horstmann Centaur plus C17, 7 day timer which is wired through a Vaillant VRT30 stat to terminals 3 & 4 on the boiler control panel, my VRT30...

Thanks to all for your input I will get the CU checked out to make sure the fault isn't on the electrical circuits As the CU was fitted in1991 it's perhaps the time to consider a replacement unit

Please will JW2 advise?

Please can anyone suggest a reason or reasons why the RCD in my Proteus Centaur consumer unit trips out the electric supply for no apparent reason? This might happen at any time of the day or night any time of the year, sometimes every day for a few days & then it might be every few weeks, it...

The boiler just won't run anymore with the roomstat and timer clock connected up, I can get it to run with the timer clock but I have to rely on the rad TRV's to shut the boiler down, which isn't ideal.

Would that be a check across terminals 4 and 5 for the roomstat and a check on the switching circuit for the clock?

Hi I am experiencing a malfunction with my Vaillant combi-boiler. The boiler control on the heating side is currently set up to be switched on and off via a separate room thermostat and a separate time clock, it has been working fine like this for years. (setting mode 1 as per instruction...