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vaillant 838

  1. J

    ecoTEC838 Vaillant boiler temperature spike shutoffs

    Hi, We have an intermittent but common fault on our 7 year old ecoTEC838 Vaillant boiler. When running hot water, the water temperature will suddenly spike to an auto-safety shutoff point (over 80 degrees). We get "overrun" errors "water Deficiency" errors. (Specific errors: F20 "Temp...
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