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My central heating system comprises a worcester bosch system boiler and honeywell smartfit controls. The problem I am having is that the central heating doesn't seem to knock off at the preset temperature I have to go to the room unit and reduce the temperature by 2/3 degrees and then turn it back up; is the fault in the room unit or a sticking relay in the control unit? regards terry

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You could possibly have an ignition problem. The controller will go into a lock-out condition if flame is not established. Turning the temperature control down and then back up may be serving to reset the control system so it tries again.

Posted on May 22, 2008

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