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Mend Potterton Boiler Noise

potterton puma ketteling overnight?

when left overnight my boiler is overheating and spitting out steam it also makes some noise like the fan is running please can you help me.thanks.

jim
October 2010
Domestic water housing has probably leaked through the stuffing box, this makes the pin stick out onto the H/W microswitch, boiler thinks it's constantly in demand for water.
A new water section will probably sort it.

Carefree
October 2010
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