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when heating system put on pressure rises when only hot water on system is ?

what causes pressure to rise when central heating system switched on

dorothy
January 2011
Heating, Home Heating SystemsHeating Put Only Water System
Sounds like the expansion vessel has lost its charge

Dave
January 2011

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Boiler cycle?
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Vaillant ecotec 831 plus?
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Remove boiler cover?
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Fan tries to run every 15 seconds then stops immediately?
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Vaillant timeswitch 150 analogue unit (clock stopped?

vaillant timeswitch 150 analogue unit. the clock has stopped working.
Mend Heating, Home Heating Systems

Worcester boiler dripping water?

Worcester boiler dripping water, can I just tight the screw? The icon next to the valve looks like radiators... [Read more]
Mend Heating, Home Heating Systems

Vaillant ecotec 831 plus?

Following a F22 fault where we had no heating and only cold water from the hot water tap, I topped up the syst... [Read more]
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Remove boiler cover?

how can i remove the front cover of my ideal logic boiler?
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Siemens RDJ10RF thermostat problem?

My temp is showing on the reciever alot higher than it actually is & each time I turn the temp up to get the h... [Read more]
Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems