Radiator cold - even after bleeding

28 Nov 2017
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United Kingdom

I've just had an extension built with wet underfloor heating, and took the opportunity to split the heating into 3 zones. Kitchen/diner (with UFH), Lounge/hall (rads) & Bedrooms (rads). System is a combi boiler, 3 x Heatmiser Neo thermostats and 3 x S plan valves, and each rad has a TRV - it works well, except one of the rads in a bedroom that is not heating up.

All the other radiators on that circuit work and I have bled the radiator but there was no air trapped.

Any ideas?
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Do other radiators in the bedrooms zone work? Have you enabled just that one zone to see if the problem rad warms up?

If not, turn off the other rads in that zone and see if it then works. Assuming it does, balance the radiators in that zone to get all of them working. You will then need to balance the other zones as well.
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Thanks both. Rad has a TRV, doesn't feel stuck but obviously could be faulty. Other rads in the zone work - will have a go at balancing when I get home tonight

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