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how to fix an appliance overheat?

red light permenantly on manual says contact service centre can i fix myself
carl, March 2013
Probably not - it helps to say the make and model of your Heating System.

The flames make the water hot and the pump moves the heated water around the system - if the pump is defective then the risk is that the water might boil and there's a mighty explosion.

You need an expert to look at it - avoid the big firms.

Good luck...

Peccavi, March 2013