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how can i fix my potterton puma 80 combi boiler?

my boiler lights and runs, heating all the rads, but it keeps going and over heats the rads and the presure on the gauge gos into the red

dell
November 2010
PottertonHeating, Home Heating SystemsPotterton Puma 80 Combi Boiler
is the red led light on pcb on with taps off. if yes hot water flow microswitch is stuck on, boiler thinks water running and will stay on untill its overheats, locks out and steam excapes thru air release at top and safety valve at bottom, pressure guage will pulse very high with steam

deano
November 2010
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potterton 16/22 pilot lihght out?
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Pressure gauge on a Potterton Boiler?
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Potterton Prima 60F- can you start it manually?
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Potterton heatmax combi?
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My potterton boiler keeps losing water pressure and condens?
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Potterton Prima 30F?
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E133?
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Replace potterton mini minder Es?
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Potterton EP2000 - pump control?
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Potterton ep22?
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Potterton Perfoma 24. Hot water works fine No heating?
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How to replace Potterton EP 3002 with EP 2?

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Potterton PrimaPotterton Prima 30FPotterton Prima F

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Free repair help for Potterton home heating systems