Fonyt

No buffer tank installed.

Sorry, I completely forgot about my post here, seems notifications weren't enabled. Thanks for the reply. I'm still sort of seeing this same issue a year later, I have reduced the curve and it's now set to 28°c at low ambient temps and 20°c at high ambient temperatures, but it still keeps running even after it hits 21°c though it doesn't go as high as 22°c now, maybe this is how it's meant to operate? Is it by design that it runs constantly to maintain temperature? I just assumed it would turn off as soon as it hits 21°c. Some other measures I've taken: I've since checked online and tried rebinding the wireless stat and on the controller it is showing the temperature that is set on the wireless stat (I changed it to lower and higher temps to make sure it was updating and not showing 21°c as a default), so it doesn't seem to be a faulty stat. There is something I happened upon by accident, when I manually turn the pump off at the controller (after it hits 21°c) and turn it back on again, the pump stays off - obviously this is not a practical solution.

Thanks for your replies. I don't have a schematic, but I can provide an overview of our system. House is 230m2 with 4 thermostat controller bedrooms Hitachi Yutaki M4 11 kW Monobloc Heat Pump & Hitachi Main Controller Air permeability 1.4 m3/h.m2 Underfloor heating throughout Hot water cylinder 1 circuit covering downstairs and upstairs Downstairs wireless thermostat controls the overall system - so in theory when it hits its temperature (21°c) it turns the both the circuits off. Upstairs thermostats are wired and only control the manifolds, they are set to close at 18°c. The system is currently set on points and looks like this: Let me know if there's any other information that would help, thanks.

Hi folks, I know this post is really old, but I'm at a loss and it's the only one that I could find on Google that is relevant to some issues I'm having. Our heat pump has been running constantly recently and it's costing us a fortune, about 6 months ago the machine was knocked off during a power outage and was reset to factory, I followed the recommended setup but it's not been right since. Our thermostat is set to 21°c, but room temp at 22.5°c (way too warm - verified with a separate temp gauge). The company who installed our Yutaki M Heat Pump have since gone out of business and any of the literature I've found I can't really make sense of. Could anyone explain the the points, gradient and fixed modes for me, what do the temperature relate to? Any recommendations for a generic setup for the UK climate. Thanks in advance.