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vaillant vuw 828, central heating,what dose sh.f mean?

vaillant 828e when i put the boiler on the central runs for about min then stops and then stops and the process continues to do the same and a code of sf.h is show.also up stairs radiators are hot but down stairs are luk warm.hot water is fine.

jo
January 2009
VaillantHeating, Home Heating Systems
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how to fix water pressure its down at bottom of grey part?
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Hot water comes and goes!?
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vaillant ecoTEC plus boiler fault code - how to fix?
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Vaillant ecotec 831 plus?
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Vaillant eco plus 531 boiler?
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What does f.25 mean?
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Vaillant F22 fault?
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Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
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Vaillant vcw gb242 eh central heating problem?
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Vaillant 828E - no hot water?
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how do I rectify the fault as detailed below?
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Vaillant condensing boiler ecoTEC plus?

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Vaillant ecoTEC 831 Plus

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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]
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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]
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Boiler cycle?

My boiler only fires up for about 90 seconds greenstar 4000
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