The air pressure switch enables safety protocols that check the fan is working correctly. It ensures that, if the fan fails within the boiler, there would not be a build up of noxious fumes with no means of venting them. The PCB closely monitors the air pressure switch to make sure it is completely operational before the unit is fired up, preventing the appliance from starting without one of its key safety features.
Heatline: S24 COMPACT, S30 COMPACT, HYDROLINE B24, CAPRIZ 25, CAPRIZ 25S, CAPRIZ 28, CAPRIZ 28S, COMPACT S20S, COMPACT S24, COMPACT S24S, IG24, VIZO 24, SYSTEM S20, SYSTEM S24, SYSTEM S30
Demrad: Kalisto Bitermik, HK C 124, HK C 224, Kalisto mono, HK D 120, HK D 124, HK D 224, Tayros, BK (HK) 124, Aden, HK B 124, HK B 224, Solaris