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  1. Over the summer, I reduce the flow temperature in...

    Over the summer, I reduce the flow temperature in the radiators to luke warm via a 3-way mixing valve on the boiler, and set a single zone to heat to an unattainably high temperature for a couple of...
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    Evohome is a great retrofit to an existing...

    Evohome is a great retrofit to an existing system. Hometronic was certainly the best I could do without a major refit. However, if you have decided on a complete refit, I would give preference to a...
  3. Thread: Heat Genius

    by JohnnyP
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    Do you need heating on when you're in bed? My...

    Do you need heating on when you're in bed? My system goes off at 11pm and doesn't come back 'til 6am. (And I'm in a draughty Victorian pile in NW Scotland.) That will solve your noisy actuator...
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    I hesitated over using the word "equilibrium",...

    I hesitated over using the word "equilibrium", it's too subjective. In my earlier post, you could more accurately substitute "the state in which Hometronic/Evohome decides to short cycle". But that...
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    Once Evohome or Hometronic reaches equilibrium it...

    Once Evohome or Hometronic reaches equilibrium it will short cycle your boiler (usually 2mins per 10mins, but can be even shorter, say 30secs). If optimisation is OFF your system will spend less time...
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    The 1 minute in 10 minute boiler cycling may be...

    The 1 minute in 10 minute boiler cycling may be stopped by adding a time delay relay after the Honeywell boiler controller. There's a thread on here from about 2009 dealing with it...
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    If the two HR92s are bound to the same zone, and...

    If the two HR92s are bound to the same zone, and one is designated at the temperature sensor, then even if one HR92 is on FUL stroke and the other on DEF, then they should both activate at the same...
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    This may not help... because I've a Hometronic...

    This may not help... because I've a Hometronic setup, but the HR92s are the same, so... If I had your situation with two quite different radiator locations in the same zone, I would not explicitly...
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    In my case, the question is impossible to answer,...

    In my case, the question is impossible to answer, since the temperature profiles of the house 'before' and 'after' installation are completely different. All I can say is that subjectively, the house...
  10. Radiator balancing with Evohome/Hometronic/etc.

    I've been using Hometronic for years now, but only recently started wondering about the position of the lockshield (return) valves on the radiators. When first installing hometronic I'd just left the...
  11. Try binding the HR80 whilst holding it within a...

    Try binding the HR80 whilst holding it within a couple of metres of the HCM200D. If that works, then your radiator location is difficult. In that case I would suggest sticking some aluminium kitchen...
  12. I've just typed up a long and considered response...

    I've just typed up a long and considered response to your post, but by the time I came to hit the Reply button I'd been logged out, so lost the reply. Can't be bothered to type it all again. Sorry.
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    After problems with an HR80 repeatedly losing...

    After problems with an HR80 repeatedly losing comms, probably due to a combination of distance and age, I had to remove it whilst I went on holiday to prevent the boiling firing constantly. When...
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    What are users' experiences of HR80s failing?...

    What are users' experiences of HR80s failing? I've had 2 fail now, after about 4yrs of a system using 40. The first failure was quite interesting, with the HR80 interfering with adjacent HR80s,...
  15. I'd have a look on www.mjtcontrols.co.uk - that's...

    I'd have a look on www.mjtcontrols.co.uk - that's where I identified my Danfoss valves.
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    It sounds like you need a new HR80, but before...

    It sounds like you need a new HR80, but before throwing out the old one, make sure you've tried it on "FULL" setting as opposed to "DEFAULT". The FULL setting does not try to determine the extent of...
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    In normal circumstances the achieved...

    In normal circumstances the achieved temperatures, as reported by either HR80s or remote HCW82s, are close, +/- 0.5C, to the setpoints once the system has been running for a while. However, some of...
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    Wow - never had all HR80s lose comms at once....

    Wow - never had all HR80s lose comms at once. Very disconcerting, and warm! I've had the odd one lose comms as discussed in this thread, which includes the very detailed explanation of the "lost...
  19. Thread: CM67z opt

    by JohnnyP
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    Hi, don't know much about the cm67z, but you can...

    Hi, don't know much about the cm67z, but you can disable optimisation by entering Installers Set Up Mode (section 8.1 of the installation instructions) and changing parameter 15, Optimisation Enable,...
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    Not sure I can help, but here are the two cases...

    Not sure I can help, but here are the two cases when my Hometronic setup has fired up the boiler when I didn't want it to: first, when the heating has reached, or is near equilibrium, the boiler is...
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    That's great information - thanks. I'm pleased to...

    That's great information - thanks. I'm pleased to hear that an HR80 in this state will attempt to sync every 24hrs. I've been concerned that if I were away and this condition occurred then a radiator...
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    The mode you describe matches my situation - and...

    The mode you describe matches my situation - and explains why the manager is triggering the boiler even though it's not receiving a signal from the HR80, a failsafe frost-protect. I'm sure it is...
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    Hi Neil - thanks for reply. There are no warnings...

    Hi Neil - thanks for reply. There are no warnings or unusual status messages at the HCM200D, and no, the incidents are not associated with power cuts. I'm a little encouraged that you believe a...
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    I've dug out this old thread to add my comments...

    I've dug out this old thread to add my comments after living with Hometronic for just over a year. About five or six times now I have heard my boiler switch on when it should be off (for example, in...
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    I've had a few requests for the wiring of the...

    I've had a few requests for the wiring of the M1EDK time delay relay, and since I can't work out how to send an attachment in a pm, I've attached it here.

    I strongly recommend using the test...
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