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ok, this makes sense. how do i confirm whether the valve is working or not before having it changed if necessary?

i understand this but if the valve is not working (stopping hot water getting through) when the manifold pump is on, how does the hot water get through when the manifold pump is off?

sorry for the misunderstanding. if the valve is not working correctly then is it normal that when the manifold pump is switched off, the hot water passes through no problem and the manifold gets hot to around 60-70 degrees?

ok, so if the sensor is removed then the temperature should be much higher should it not? also if 30 degrees is the correct temperature then how is it meant to heat up the rooms? i was told that the correct temperature is around 55 degrees.

the sensor you are describing is connected to the thermostat head and therefore has been disconnected. are you saying the 30 degrees is the correct temperature for ufh to be working at? if so, why arent the rooms heating up? as the sensor has been removed as well as the thermostat head...

which sensor are we talking about? if the valve is faulty, would it let through the hot water when the pump is switched off?

yes it seems that the loops are reaching 30 degrees and the pump seems to be working. the loops may be at 30 degrees but this is not enough to heat the rooms. is it possible that the pump is not working full force hence unable to pull through the hot water?

As i stated, the thermostat head was removed and therefore there should be no hinderance to the hot water coming through.

The temperature guage is showing around 30 degrees when the manifold pump is on. When the manifold pump is off, the temperature shows around 60-70 degrees which is the approx temp that the boiler is set to.

I did think the pump was the wrong way but the arrow on the front is pointing up which is the correct way. Is there any chance that the pump is working in reverse? When the pump is on, I can see that there is water travelling through the underfloor pipes as the glass guages show this...

Thanks. If the valve is faulty, then would it let through the hot water when the pump was turned off? There doesnt seem to be any relation between the pump and the valve so I dont understand how the water flows if the pump is off but doesnt if the pump is on. Any suggestions?

My underfloor heating manifold is the "pump mixing modular manifold" as per the link below: http://www.warmafloor.co.uk/pdfs/std-pmp-manifolds.pdf The problem being that, when the pump is on, the hot water gets as far as the injector valve but doesnt continue around the manifold and hence...