Polypipe underfloor heating

[formula400]

any of you guy know anything about or understand it??? I've got it at home and all of a sudden can't get it to work.

[KungFooBob]

I used to work for Polypipe.

In IT, so I've no idea about any of their products, sorry.

[formula400]

I used to work for Polypipe.

In IT, so I've no idea about any of their products, sorry.

I got very excited for a minute

[KungFooBob]

I now work for a home automation and heating manufacturer with a large range of RF and IoT enabled underfloor heating products.

In IT, so I've no idea about the products, sorry.

[ogri]

Sounds expensive to fix, hopefully not for you.

[Silly Car]

My understanding of underfloor heating is it is like having radiators under the floor so...

Timer - is it working, do the batteries need changing in any remote thermostats

Boiler - do you have hot water, are any other radiators working.

Zone (2 port) valves - do they open when timer / t.stat call for heat - have / can you move them into manual position

Pump - is it running when / if the system is calling for heat

[formula400]

My understanding of underfloor heating is it is like having radiators under the floor so...

Timer - is it working, do the batteries need changing in any remote thermostats

Boiler - do you have hot water, are any other radiators working.

Zone (2 port) valves - do they open when timer / t.stat call for heat - have / can you move them into manual position

Pump - is it running when / if the system is calling for heat

Timer, we have it set to between 20/22 and have never used the timer in the 4 years ive been here, we have the 2 thermostats that run out of batteries that have now been replaced.

boiler, I have hot water in every tap in the house and the bath/shower

zone I believe they are open

pump is running, when its not calling for heating the green light goes off, and comes on when it does

[Cousin Jack]

If it's like my system a few more things to check

Heating/hot water - ours has a timer that can be set for each independently - I know you don't use the timer but check the programmer and it's battery.

Boiler itself, is it firing when stats demand heating and not HW?

Boiler - is the pressure OK? Iffy pressure may mean it sometimes fires and sometimes doesn't.

Other than simple things like that it's time to call an expert/hit it with a hammer.

[formula400]

not sure about the time, I don't think we have one,

boiler and pressure are fine


this is the manual for the thermostat its self https://www.theunderfloorheatingstore.c ... manual.pdf

I am hoping its a setting from when the batteries died or something but ive not idea really.

11. installer menu

Airc: Calibration of the internal probe The calibration can done after 1 working day with the same setting temperature in accordance with the following description:
Put a thermometer in the room at 1.5M distance from the floor (like the thermostat) and check the real temperature in the room after 1 hour.
When you enter on the calibration parameter “no” is displayed on the right to indicate no calibration has made.
To enter the value read on the thermometer, use the (-) or (+) keys to enter the real value. Once, press (OK) to confirm.
The message “Yes” should be displayed, the value will be stored in the internal memory.
If you need to erase a calibration press on the escape key ( ).
The old value will be erased and the message “no” will be displayed.
Note: Only the heating element managed
by the thermostat must be run during the complete step of the calibration.

[Cousin Jack]

Time to bite the bullet and call a heating engineer.

It will hopefully be something trivial but tracking it down may not be. My system has 3 room thermostats (2 different designs), a boiler stat and a tank stat, 3 programmers (all different designs), 2 pressure gauges and more valves than you can shake a stick at.

[Horse]

Under the floor there is only pipe, either in supports or embedded in screed. A blockage or leak is unlikely. More likely pump / mixer* thingy jobbie. You have now reached the limit of my knowledge.

* Ours runs at a lower temperature than the rads in the rest of the house.

[formula400]

I got this reply from Polypipe, maybe is time get some one in

what I don't understand is that 3/4 weeks ago it would go up to 23/24 (not that I kept it there) now now down stairs is max 21 and upstairs is 19.2


Hi Lewis.

I’m not sure there is anything wrong with your thermostat.
I think you should get a calibrated digital temperature sensor and check the actual temperature in the room before adjusting the thermostat.
I also believe you may wish to have the manifold recommissioned (bled and balanced) to ensure its outputs.
You may also want to have your windows, doors and wall insulation checked, if it is possible to get a domestic premises room up to 28+ in mid-winter it would require extreme levels of insulation and there is a chance over the last few years the resistance values of your insulation could have fallen.
Please remember that UFH is only designed to provide a standard comfort level, it’s not really supposed to heat much past 25C at maximum.

[Mussels]

I'd start with 'calibrated digital temperature sensor'
They are cheap and easy to get hold of but I guess if your house is freezing it won't tell you anything you don't know.
https://www.screwfix.com/p/magnusson-im ... eter/1352x

It is probably quite a simple system so I guess the question is how urgent is it? If it is a simple fix then a local plumber should be able to spot and correct it quite quickly and not cost the earth, I wouldn't start with a specialist company that charges specialist prices.

[David]

My suspicion is that the pump impellor has lost its attachment to the motor.....

[formula400]

the house is not cold, it seems not to go any higher than 20 on the thermostat. ill get the wife to bring her thermometer home from work and try that.

another reply from Polypipe.

It is the coldest it has been in quite a while and an E rated property is going to loose large amounts of heat.
If your system is fully operational and the thermostats are showing the correct temperatures then maybe the system is not enough to heat your home alone and may require additional heating, or you may wish to improve the efficiency of your home.

Thanks.

[maccecht]

Has your boiler lost pressure recently? On the UF heating manifold there will be little port valves which open and close as you demand heat.. There is normally an indicator on them to show open or closed sometimes they stick just like TRV's as in the pin gets stuck even though the port is open. There should also be a pressure valve showing 1 bar minimum.

[Nobby]

From your photo of the pump , the Temperature of the water in the manifold is 55. That would be correct.
How many stats have you got ?
How many " heads" have you got on the manifold ?
It could be one ( or more) of these have failed partially,though that is rare.
I would number the heads from left to right then unscrew them. This will release the pin to allow max flow to the pipe. Have a look at the flow indicators below to see.

[ace llani]

Is the boiler working other heat sources (radiators) OK?

Might be the pipes underfloor have a blockage, little bits of solder can collect on a bend.

Maybe get it flushed out, and fit a Magnaclean (other brands are available) to catch all the crap going forward.

(not a plumber but ran a plumber's merchants for a year).