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If there is a speed I setting then it's very well hidden! I have a digital thermometer with external probe and I have recently purchased a temperature data logger with probe which is how I am monitoring the flow temperature. Excellent device and not expensive.

Yes, there is an ABV but I'll have to do a bit of rummaging in the garage to read the actual setting. I assume that it is OK as I can hear it operating when zone valve(s) close and the pump runs on for 3 minutes. I will try reducing the pump speed to II and see what happens. I will also log the...

Grundfos pump is marked as: Type: UPS0 15-60 A0KR. (From a web search it seems that this is now obsolete.) It has two speed settings marked as II and III. It is on the higher flow rate as the installer said that this was necessary for my CH system.

@Johntheo5 Thanks for your reply. Apparently nothing adjustable on this boiler - it either works or it doesn't! Certainly a temperature drop of 5C would be acceptable but mine is falling ~18C and around 20 minutes before re-ignition. My measurements don't show the boiler going over temperature...

I have a Honeywell T4R thermostat which I bought last year as a replacement for my long-serving CM927. It's working fine but I haven't tried the optimum start / stop or the delayed start options. Has anyone tried these and are they effective?

Worcester Bosch engineer came yesterday to look at the boiler issue. Spent a lot of time looking at the system and eventually replaced the temperature sensor. It hasn't made any difference! When heating HW only, boiler goes to set point (~73C at the moment), boiler stops firing and doesn't...

I have had a temeprature data logger measuring the temperature on the flow pipe from the boiler. Temperature peaked at around 70C after 35 minutes and then dropped to 51C over the remainder of the one hour cycle. Boiler did not re-ignite. Bosch attending tomorrow to replace the temperature...

I've got one on the flow pipe which is how I'm monitoring the temperature. I am thinking about buying a simple temperature data logger so that I can prove to WB what is actually happening.

I have a Worcester Bosch Greenstar 24ri gas fired boiler for water and central heating. Hot water is via an indirect cylinder, tank stat set to 60C and boiler set to give flow temperature at around 73C (measured using contact thermocouple on pipe). Grundfoss pump set on speed setting 2 of 2...

A long time since I started this thread but I have finally bought and installed a Honeywell T4R wireless thermostat to replace the EPH CP4. Early days, but so far so good. I am back to 6 cycles / hour recommended for gas boilers and I have set the minimum run time to 2 minutes. The system...

Let us know how you get on with it. Good idea just to order the room stat and then add to it. My reservation about having something with app control is that neither my wife nor I are spring chickens any more and, although we are reasonably tech savvy, we need a system that is straightforward in use.

I'm sure that you are right. Out of interest, and a fair amount of frustration, I put the EPH in to 'normal' mode this evening. Gas consumption has rocketed which was not a surprise and, like you, I have ended up heating the whole house despite the TRVs being wound right down. I'll take a good...

Thank you. I do like the idea of being able to control the temperature in each room separately - it makes sense but to install the Drayton Wiser would cost me around £500. (And that's assuming that I can do it all myself.) Would I get the return? Don't know is the short answer. I have read...

I can see a lot of threads about wireless room thermostats but as many of them are some years old I would appreciate some recommendations please. I have a Worcester Bosch Greenstar 24Ri boiler and am currently using an EPH CP4 wireless thermostat. I am not very impressed with this! I prefer to...

The plastic becomes brittle with age and eventually breaks. I have only had a couple of these fail in over 20 years. Repalcement heads are around £18 ea from Screwfix. Check that the pin on the valve body is moving freely before you fit the new head.

I think that is exactly what is happening! It seems to stabilise at 0.4C below set point when the burn time will be longer of course. Maybe! I am currently experimenting with the CP4 set at 2 cycles per hour and, at the moment, it seems to be behaving. I am going to ask the heating installer...

No, tried that. Because boiler runs flat out there is a big overshoot on set point and consequently requires a big fall in room temperature before system starts again. Uncomfortable! Few moving parts on an old boiler. Might be worth trying again. No, I didn't. Display kept failing on the...

The old boiler was a traditional on / off, full flame or nothing! The Honeywell CM927 did short cycle as it approached set point and as the room temperature started to fall but at least the heat input was significant. From memory there was a minimum on time setting. Control was spot on!

All my initial observations were done with 3CPH and prop band at 1.5C. On time with a temperature drop of 0.1C is approx 1 minute, consistent with the calculated time. Yes, the boiler fires immediately. The boiler is a variable flame unit and never starts on full flame. This is normal. Yes...

I have an EPH CP4 wireless thermostat controlling a Greenstar 24Ri gas condensing boiler. The CP4 was a replacement for my old Honeywell CM927. I use the CP4 in TPI mode. (If I run it in ‘normal’ mode I get a huge overshoot on set point temperature.) The default settings are 6 cycles per hour...