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Mend Worcester Bosch 24 CDi Prob Boiler Heating

Worcestor Bosch 24 CDi combi prob?

Just one problem.... boiler turns on heating if boiler is powered up, even though program is set to OFF.
Hot water is fine, shower, taps etc.
Manual troubleshoot guide kind of leads to replacing circuit board, but Im unsure, any advice appreciated and thanks in advance.

Jeff
September 2008

Worcester Bosch Worcester Bosch 24 CDi Heating, Home Heating Systems Prob Boiler Heating

Hi, thanx for reply. 24CDi doesnt have a flow switch, but prob is sorted now, was PCB, cheers.

Jeff
October 2008

Disconnect all external controls, frost stat (if fitted), room stat, internal clock.

Still firing?

Disconnect flow switch (two pink wires).

Still firing?

Yep, pcb.

BunSlinger
September 2008

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Worcester Bosch 24 CDi - Heating On When Off