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thank you for explaining...

Thanks again.. I will order now.. I have a room stat combined with timer (a Salus 520) and the heating is fine.. it is just the water timing that is the issue.. and I also have a stat on the cylinder.. The flaky timer/programer (which is working this morning) seems to be wired to make or...

This seems to be the issue (and this was the last bit to be done and it wasn't done by the main guys) ... and is is my suspicion from the start BUT what confuses me is it works some of the time? Which is confusing no? Is this possible with a mis-wired programer/timer.. ?

Thank you Sxturbo for correcting me.. I will investigate further ... but I am 99% it is a S-plan setup But to check surely the https://salus-controls.com/uk/product/ep110/#downloads I posted above is a similar thing? anyways the link you sent it great as there is a screwfix close to me I...

No two very experienced guys but the main bulk of it was done by them but at the end it was a younger guy who finish it of... The Underfloor heating is working great as are the radiators and the controls for both of them... it is simply the hot-water.. as much I appreicate the time you have...

I can do that tomorrow.. I think I will buy this and swap with the other timer https://salus-controls.com/uk/product/ep110/#downloads

] sorry for calling my cylinder a tank... Yes you 100% understand! I want to do exactly as you suggest re timings.. but the Salus RT520TX programmer/thermostat I have only controls the radiators.. and they have installed the simple timer to do the hot water. Is this wrong?

Ok let me ask another perhaps better question.. So instead of "Most reliable a hot water cylinder timer (fed from system boiler)?" Perhaps I should be asking ...with a system boiler what is the best way to be time specific about turning the hot water call on from the cylinder's thermostat...

Sorry not to be clear but it is a conventional boiler... I assumed as my post says "Most reliable a hot water cylinder timer (fed from system boiler)" this was implied? thank you

Yes I have worried about that, and you may be right, but since it works some of the time I can't myself imagine the 'other' issue. The timer surely isn't really more than a switch which is in series opening a Thermal Actuator and trigger a thermostat on so it can make calls on my gas boiler...

Conventional system boiler with a very insulated cylinder.. thanks PS I have edited this post as I stupidly originally misnamed the cylinder a tank :-(

Simply... my timer (despite having a battery backup and uninterrupted power) keeps reseting .. Good question and one I have asked... so basically I am asking what should I have? what is the best timer/programer for this situation? thanks JohnD

Hi I have one of these and it keep resetting (and since it us under the house it is driving me mad as I bump my head reprogramming it and my family moans there is no hotwater) https://www.screwfix.com/p/lap-7-day-digital-immersion-timer/1804r I assumed it was faulty so swapped it out for the...