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vaillant open vent ecotec plus 418 fault 28?

boiler fired up when first turned on then turned it off when turned on again no egnition two codes come up s98 and f28

jonnie
November 2007
VaillantHeating, Home Heating SystemsVaillant Fault Boiler
Quote from Service manual (available as pdf from vailliant site)
Fault 28 - Fault in the gas supply such as:-Gas meter or Gas pressure detector defective. Air in gas, gas pressure too low. Fire detection tap has disengaged. Fault in the gas valve, wrong gas setting, Igniter (ignition transformer, ignition cable, ignition plug) defective. Ionisation currnent stopped (cable, electrode), Faulty earthing in appliance, electronics defective.

S98Flow/Return sensor check is running. demand (DHW or Heating) is blocked.

Peter kay
December 2007

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