Vaillant Fault Code F.20

F.20

Safety switch-off: Temperature limiter: Incorrect earth connection between cable harness and product, flow or return NTC defective (loose connection), black discharge via ignition cable, ignition plug or ignition electrode




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Ware, Harlow, Hertford, Broxbourne, Hoddesdon, Roydon, Epping, Loughton, Woodford, Chingford, Enfield, Edmonton, Tottenham, Wood Green, Crouch End, Holloway, Hackney and Central London

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