System Overheat on Central Heating

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30 Jan 2006
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Combi 80 Boiler exceeds the Drayton RF1 Thermostat temp setting?

I have replaced both the Overheat and Frost Thermostats but still no joy!

Would appreciate any suggestions as the only solution I can see is opening a Sauna.
 
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The thermostat should be turning the boiler off.
Combi boilers come with a wire link so the combi is on all the time (clock on). If you put a thermostat in to control the boiler, the wire link should be removed.
 
Thanks for the info, Is the Wire Link in the Boiler and if so where can I find it?

Regards

Eddy
 
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DHW flow switch stuck holds CH on forever. Indicated by red light on pcb.
 

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