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Providing that they have worked at some point it's likely to be one of two things. Faulty/closed valve or blockage/air lock.
You need to close the valves and remove a rad, then open each valve into a bucket.
Doing this tests each valve and will also allow you to determine if there's a blockage. Often with a blockage or air lock - opening a valve into a bucket will give you a trickle and a splutter and then the blockage will clear.
If you're on a combi you need to keep the pressure topped up when doing this, you could go up to about 2.5 bar if it's stubborn, just make sure you go back down to 1 bar afterwards.
A radiator can bleed normally if only one of the 2 connecting pipes is blocked or only one valve is closed or faulty so the fact that you can bleed the rad isn't really useful.
Google how to remove a radiator, it's not as difficult as you might think, couple of towels and trays and you're away.
I would advise you to get a plumber in, but you've been advised that already and seem to be willing to try to fix the issue yourself.
Your system sounds like it will need balancing after, there are threads on this forum that go into detail about balancing.
You need to close the valves and remove a rad, then open each valve into a bucket.
Doing this tests each valve and will also allow you to determine if there's a blockage. Often with a blockage or air lock - opening a valve into a bucket will give you a trickle and a splutter and then the blockage will clear.
If you're on a combi you need to keep the pressure topped up when doing this, you could go up to about 2.5 bar if it's stubborn, just make sure you go back down to 1 bar afterwards.
A radiator can bleed normally if only one of the 2 connecting pipes is blocked or only one valve is closed or faulty so the fact that you can bleed the rad isn't really useful.
Google how to remove a radiator, it's not as difficult as you might think, couple of towels and trays and you're away.
I would advise you to get a plumber in, but you've been advised that already and seem to be willing to try to fix the issue yourself.
Your system sounds like it will need balancing after, there are threads on this forum that go into detail about balancing.
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