Wet underfloor heating issue

[awaitcall]

Need some urgent help please
Installed wet central heating over a year ago and it has not worked as it should. Cold patches around the install
It is on 3 zones tried removing any air locks even removed the actuators still same issue. Even spoke to technical not much help.

Any professional tips from you pros out ther please

 

[SpecialK]

Do the flow indicators show flow to all the zones? Does the manifold stay consistently warm or is your boiler stuck cycling and going in to a 10 minute anti cycle?

 

[Rodders53]

Have you called back the Installer when this issue was apparent during operation over the last winter?
If not, why not?

Mind the oil fired UFH we have has such cold spots. It was in the house we bought. Installed as part of the build 16/17 years ago. Pretty sure the designer-installers had all the gear and no idea.

 

[awaitcall]

It was installed by me. Installed many without issues.
This is my own house lol
Yes ther is flow to each zone.
The issue iv noticed when ufh is on the temp of the boiler rises up very quickly but when rads are on too the its fine

 

[Exedon]

So the underfloor works correctly when rads are on as well but not when it's on its own?
Clear pictures of manifold any motorised valves and sketch of pipework layout would be useful.

 

[Johntheo5]

It was installed by me. Installed many without issues.
This is my own house lol
Yes ther is flow to each zone.
The issue iv noticed when ufh is on the temp of the boiler rises up very quickly but when rads are on too the its fine

If the rads+UFH are on together and if you turn off the rads does the boiler then continue to run on UFH only?.
What do the UFH flow meters read?.

If a gas boiler then as long as its minimum output is lower than the UFH demand then it should run continuously as long as the boiler flow/return dT is less than 30C, for example if you have a UFH demand of say 6kw (and a boiler minimum output of 5kw) if the UFH manifold temperature is 45C and the return is 37C, the UFH flowrate will be 10.75LPM and if the boiler flowtemp is 65C then the boiler flowrate will only be 3.07LPM at a dT of 28C, the biggest problem normally is to able to get the boiler to fire up (on UFH only) as most gas boilers fire up at ~ 65% of max output before modulating down so the temperature will rise very rapidly and if it exceeds the boiler set point +5C then the burner will trip and the boiler circ pump (and the UFH manifold pump) will continue to run until the anticycle time has elapsed, the boiler will then refire.