Vaillant Fault Code F.23
F.23
Safety switch-off: Temp.spread too large: Pump blocked, insufficient pump output, air in product, flow and return NTC connected the wrong way round
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Landlord Gas Safety Inspections
Enfield, Cheshunt, Ware, Hertford, Harlow, Edmonton, Tottenham, Loughton, Chingford
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Call us now on 01992 308232
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