Hi do you know the make or type of oil boiler that you have?
rob
November 2008
Does it have a frost 'stat? If so it will override any programmer setting because it is trying to prevent your system from freezing. Check its setting 2-3 oC. How cold is it where you are?
If everything checks out ok, then start suspecting a jammed switch in the programmer
Cledlyn
November 2008
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