My ecoTEC 630 is not igniting error message F73. The pressure is in the middle of the grey
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How long has the fault been there and have you had any cut in power supply to the boiler prior to the fault appearing
F73 is indicative of the water pressure sensor being defective or a short or fault in the wiring to it. It is not a do it yourself job.. You are well advised to call a Vaillant engineer in.. You can call Vaillant Ltd on #0845-602-2922Please take a moment to rate my assistance.. Please use the smiley faces to do this.