yeah I have a combi boiler, fitted about 15yrs ago. radiator performance is all up and down, no matter how you turn it down or up, it's either boiling hot, or cold, and sometimes it's boiling hot when the valve says it should be off.
Sounds like the trv valves are stuck.
@Howard started
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yeah I have a combi boiler, fitted about 15yrs ago. radiator performance is all up and down, no matter how you turn it down or up, it's either boiling hot, or cold, and sometimes it's boiling hot when the valve says it should be off.