5 hours ago: Nav screen shows: Result:NG in red?

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Nav screen shows: Result:NG in red?

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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]
Mend boiler heating fault

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Vaillant Turbomax pro. The central heating will not come on but the hot water is working ok
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No hot water, intermittent when air temp drops?
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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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How do I fix f22 error on my Vaillent Ecotec Plus boiler?
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Vaillant 828E - no hot water?
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Vaillant vcw gb242 eh central heating problem?
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Problem with the pressure in combi boiler?
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Vaillant eco plus 531 boiler?
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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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Valiant thermostat , BMU-Err ?
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Vaillant ecomax 828/2 e water pressure sensor?
Mend boiler heating Vaillant

how to fix water pressure its down at bottom of grey part?
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Vaillant Thermocompact Fault?
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can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
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Hot water comes and goes!?
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my vaillant boiler is saying a code com on it ?
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Advice?
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how do I rectify the fault as detailed below?

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