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It turned out to be the gas valve. Lovely and warm now :D Janos

THanks for the quick response. All the TRV's are opened fully. I've taken the TRV head off one of the rads so the spring is fully out, but the problem persists. Do you think it could be something like the overheat thermostat? Janos

Hi all, I've searched the archives and couldn't find anything on this, so I think I've discovered something new. I hope not, and that someone has come across this before and knows the solution! We have an Alpha CB24, which is connected to a load of thermostatically controlled radiators...