Hi, I wish to replace the above timer with a 7day one that seperates the hot water and heating cycles. Thanks - I read that earlier but even trying that suggestion feels like I'm pulling the baseplate off the wall too. Using the average ratings, you can check what all the reviewers think instead of just viewing the subjective opinion of one specific reviewer. Offers 16 programmes for fully pumped systems incorporating motorised or mid-position valves and 10 programmes for gravity H. If the "plate" were slightly out of alignment and just hooked on the main unit, it should have come away by now.

The 31 and 37 3 channels use same backplate but different wiring, live is not available/linked L-2-5 as 2 and 5 are used for switching. The term should really be used only for systems where the circulation through the HW coil is due to the change in density of the water when heated; i. Thanks for the reply, I have got a friend checking it out tuesday and he diagnosed exactly what you said, he said that it will be the motorised valve more than likely. Even Horstmann's later programmers, apart from having different wiring use pins instead of blades for the contact between the backplate and body. Personally I think they are fairly expensive for a mechanical basic clock, but they have been around for many years.The amount of effort I've put into it is just shy of breaking the plastic itself - I can hardly imagine how the builders installed it. There are lots of options, with a smallish number of variations, so if you decide what features you want we'll probably know of one which will do them. Pull it hard at the top (once screws are loosened) it should come away, the bottom then unhookes, this is the reverse of most other timers which pivot on the top with the screws underneath. I'd prefer not to break it as a replacement is some 90 quid, not to mention the loss of any hot water for the days it takes to turn up.

Try not to be so harsh, yes looking back that was a stupid thing to post, but I've never been on these forums before so I didn't know what to expect, I was just trying to be helpful. This was supposed to be a direct replacement, simply clipping onto the identical backplate and giving me new functionality, with the ability to set different times for different days.Regardless, I've had my mains-shock already this month (replaced some light fittings in the hall and landing, and new light switches in the garage), so I'm back to being careful again. You can have things like one or two hour boost during an OFF period or addition to an ON time, 7 day control or 5+2 day, 2 or 3 on times per day, holiday timer, single button daylight saving adjustment.

Turned off the leccy, stuck a "bladed" lever into the top (it's a wide pry-bar I'd previously ground to a flat edge) and woofed it off the wall. Another option if you do bugger it would be a single channel timer in it's place to run the hot water, then control the two heating circuits from prog room stats on each floor if possible. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. If you are poking around with a screwdriver, make sure the system is isolated - there are live terminals near the top edge. For instance, I *hope* the cabling to each thermostat allows for me to install the NEST power supply (supplies?

The HORSTMANN (SECURE) 425 TIARA PROGRAMMER - Now use 4210051 or 4210056 is a genuine, brand new Horstmann Controls product, covered by a Horstmann Controls manufacturer's guarantee.

Tiara, two channel programmer with 16/10 programme setting for fully pumped or gravity hot water/pumped CH systems.i just would like to be able to programme at least 3 times aday and what exactly does using the existing backplate mean. I can get a screwdriver between the wall box and the stand-off but there's no way they are going to separate without my breaking one of them. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. You want to have look at their controller for gas street lights, a work of art, clockwork movement is brass,.