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vaillant 18 t3w combi?

t3w 18 combi pilot light okay and lit ,pump running but

no heat or hot water,differential valve okay.solenoid does not lift .overheat stat okay faulty solenoid or pcbnot sending electrical signal?

c.ford
January 2011
VaillantHeating, Home Heating SystemsCombi Running Heat
is fan running ? if not check fan if running check fan pressure switch every boiler has a lighting sequence check each part in sequence don't jump ahead

brian
January 2011

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

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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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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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Boiler cycle?

My boiler only fires up for about 90 seconds greenstar 4000
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