fix 77 fix or replace, so your best bet is replacing the boiler entirely. Vaillant F.77 Boiler Fault de. Error Description. Fault with the flue non. Embedded Fix 77 ; Specifications. Light source. Luminus CXM-6. Output . 400mA DC24V. Total power consumption . 8W. Color temperature. 2700K3000K4000K.
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