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Ariston Beretta Vaillant Squirrel Universal Gas Boiler Air Pressure Sensor Accessories Air Pressure SwitchIn theory, the smaller the pa charge of the air strain switch, the extra touchy the air strain substitute is. If the machine makes use of the fan for a long time, there'll be bound dirt impurities within the chimney. If the tension cannot be reached, the air strain switch won't work replacing a new air pressure switch, it is recommended to make your mind up a smaller one than the original pa, and also check whether or not or not the venturi tube related to the air stress switch on the fan is burned out model : Midea / Squirrel / Rinnai / Ariston / Macro / Wanhe / Haier / VaillantBoiler mannequin and air stress change fault codeAriston: E1 air pressure/fan failureMidea: E5 fan/wind stress failureHaydn: E6 air stress failure damagedMacro: E2 air stress fault wind pressure switchYARKES: E3 air strain failureYANUO: E5 air stress fan failure replacementVaillant: F air stress replace failed