Also referred to as a pressure differential switch, it is designed to act as a safety instrument which checks if the fan is running correctly, the air pressure switch connects to the Fan via heat resistant tubes which go directly onto the fan Venturies. Through these, it enables the boiler to detect when the fan is running to ensure that if the fan fails there would not be a build-up of toxic fumes with no way of venting them, A signal would then be sent to the printed circuit board telling the boiler to stop sending gas to the burner and preventing the boiler from turning on.

Main Air Pressure Switch 5105574

Part: 5105574

Price: £43.09
Saunier Duval S202005 Air Pressure Switch

Part: S202005

Price: £50.67
Main Pressure Switch 230068

Part: 230068

Price: £41.95
Main Air Pressure Switch 5137529

Part: 5137529

Price: £32.98
Main Pressure Switch 720011401

Part: 720011401

Price: £56.16
Main Pressure Switch 642220

Part: 642220

Price: £57.06
Main Air Pressure Switch 5110393

Part: 5110393

Price: £24.84
Main Air Pressure Switch 5105575

Part: 5105575

Price: £63.36
Main Pressure Switch Solo 80 Pf 720954401

Part: 720954401

Price: £53.16
Baxi 226060 Air Pressure Switch

Part: 226060

Price: £36.75
Heatline D003200032 Compact Air Pressure Switch

Part: D003200032

Price: £86.70
Main Air Pressure Switch 5112197

Part: 5112197

Price: £24.84
Potterton Pressure Switch 230068

Part: 230068

Price: £41.95
Main Air Pressure Switch 5105867

Part: 5105867

Price: £63.36
Potterton Pressure Switch 720011401

Part: 720011401

Price: £56.16
Vokera 5926 Air Pressure Switch

Part: 5926

Price: £39.95
Chaffoteaux 571651-01 Air Pressure Switch

Part: 571651-01

Price: £46.57
Potterton Pressure Switch Kit 5111610

Part: 5111610

Price: £27.68
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