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Does anyone have a Myson MPRT wall thermostat, need some help.
edited 12 January 2021 at 11:04PM in LPG, heating oil, solid & other fuels
17 replies 1.1K views
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I have been in touch with Myson to put it plainly if I set it to 21c then it should go off at 21.5c and then will turn back on when it's 20.5c. That's definitely not doing that.
Do you know what differential has been set in the thermostat - I understand that it can be adjusted using the engineers setting if you can find out how to do it.
What temperature does the room actually get to - you probably need to get a thermometer to check it. Where is your thermostat situated, in a draught, near a rad, in the hall or even on an outside wall. Location of the unit can make a difference to it's responsiveness. How long does it take to get up to temperature (how long do you allow it to get up to temperature)
What have Myson said about it
To be honest I haven't left it for hours to see what happens as it's just wasting heat because it goes on and off to quickly that means all the radiators dont get warm enough to heat the rooms.
I'm still waiting from Myson to see if it's supposed to work this way. It can't be right though if the temperature on the stat reads 24c if I then turn it down to 20c in theory it shouldn't come back on if I turn it off and then turn it back on.
I have sent the information on to the housing association but how things are going with the developers the cold weather will be over by the time they sort it out.
Edit: I have set it lower to 21.5 so this time I will see how it behaves when I leave it on for longer.
By slowing down the rate rate at which the hall gets heated you should give the rest of the place time to warm up - thermostats should not be located anywhere near radiators as they'll be affected by the rapid heat rise
My issue is the wall thermostat not behaving how it should, setting the wall thermostat to 21c the wall thermostat should turn off the heating when its 21.5c and not come back on until the wall thermostat reads 20.5c, it goes beyond 21.5c up to 22.3c and then cycles on and off when it's 22.3c.
I just read back my first post it may sound like I'm talking about the rooms not reaching 21c, no what I'm meaning is the wall thermostat turns off before the Myson reads 21c. and when it does reach the target temperature it will then keep on going on and off when the Myson reads 21c.
Hopefully you can explain it better either to Myson or your building engineer because I'm really confused.
I set my stats to the temperature where the room is comfortable without bothering too much about the actual number although once I've established what that number is then that's where it sits (in my case it's 19 degrees) and then let it get on with it. The actual room temperature then sits at around 18-19 degrees (measured by a separate thermometer in another part of the room). However my system, having low temperature underfloor heating is extremely slow at responding (it can take several hours to increase the room temp by just one or two degrees). A system using hot water radiators will respond much more rapidly and over/undershoot a lot more.
As I can't hear them click on and off I don't know (or even care) at what temperature they actually switch providing the room temp stays fairly even .
If you ever get it sorted to your satisfaction please let us know the outcome as it may help others with a similar problem
I have now had a phonecall from the housing association, they are going to send a replacement out.
I definitely will update on this to see how it should work.