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It works! Thanks everyone for their help.

Thanks for the comprehensive way to test. I’ll try it first and confirm using this.

Thanks I will give it a go.

Thanks. Yes, there is. The only one without a wire connected is terminal 2. Here is what it looks like to confirm as well as the wiring diagram from the RBW9 programmer.

Thanks for the reply and explanation. Is there any way I can check if it will work fine set to pumped? The house was built in 2005 and originally had a Worcester Bosch 19/24cbi, I have recently had this changed for a heat only Viessmann 100-W.

I am in the process of replacing my HW & CH programmer. The current Siemens RBW9 unit has the dip switch (5) set as gravity fed. However, I have a grundfoss pump and what I believe to be a Y-plan system with a three way valve, hot water cylinder in the airing cupboard with a cold water tank and...

I am having a new Viessmann 100-W 25kW heat only boiler fitted and trying to decide whether to go with weather compensation or something like a Tado thermostat. Currently we normally use the heating from about 3:30pm in winter until about 8pm on 20c then I let it set back to 15c from 8pm until...

Thanks Freddo!

Hi everyone, I am looking to change my DT90e thermostat for a Danfoss TP7001 (battery version) and would like some guidance / confirmation as to the correct wiring up. I currently have the DT90E with the Brown wire in A and the Black wire with Brown sleeve in B. There is nothing in C, the Grey...

Thank you very much, I followed your clear instructions and now all is working perfectly. Thanks again. :) :)

Hi, I am hoping someone can give me some guidance. The job I want to do is simply to change a dimmer switch for a normal on/off switch. I have done this many times before, but not seen the kind of wiring I have on this one. The dimmer switch is for a bathroom (outside of the door), it also...

Cheers Dan, I'll persevere with it a bit longer. I work shifts, but my wife is home most of the time with young kids. If I do change it I'll just buy a basic digital stat with no TPI or the equivalent thereof. I'm interested to see if the pb on 3 will help, so will see how it goes. It...

All too true it would appear! :x

In terms of location, the stat is in the hall and I have taken all steps I can to ensure there is no draught through the wall cavity or from the front door to interfere with it working correctly. I've now adjusted the Pb to 3 and it may be a little better, but too soon to tell. I'm on nights...

Hi Dan, Thanks I'll try raising it to 3 and see what happens. I had put it on 1.5 so that when trying to achieve a higher temperature it continued to give 100% until 1.5c before the set point to heat the house up quicker. My house is well insulated, having been constructed in 2005...

Hi Dan, the Pb is set to 1.5 which is as low as it goes. I have done multiple tests on comparative consecutive days (temperature wise) and the days I left the stat at a fixed temperature (and the boiler cycling on/off due to the stat) it used considerably more gas. This backed up what...

Hi Dan, Thanks for the reply. I would agree it is acting as supposed to if only the temperature did actually drop when I turn the heating off. As this doesn't happen for more than an hour with the temperature outside greater than 6c, it does seem that the stat is too sensitive and wasting...

Thanks Fullofit, I have experimented with all the settings and changed the cycle rate per hour to 3 to bring down the amount of time the boiler fires. Unfortunately the boiler still fires (allbeit a little less often) however it still fires the boiler for only about one minute to two...

I haven't noticed any corrosion on the heat exchanger. The WB 19/24 cbi has a cast iron heat exchanger and when I checked a year ago was fine.

Hi, Is the tpi stat with a WB 19/24cbi non condensing boiler a "no no" then?