Quote Originally Posted by Psycho4Bud
Sounds like your control valve (zone valve) is froze shut. Same thing happened to the rents boiler valve. Very common thing.......

Have a good one!:thumbsup:
A zone valve usually puts out a whole floor but it could be controling one room so your answer could be correct but,,, not likely...

So for all intents and purposes it is not the zone valve but,,, Good answer...