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 Fan Pressure Switch- 5137530

Part: 5137530

Price: £32.97
Main Switch 226060

Part: 226060

Price: £36.75
Saunier Duval S230357 Air Pressure Switch

Part: S230357

Price: £53.67
Main Pressure Switch Solo 80 Pf 720954401

Part: 720954401

Price: £53.16
Potterton Pressure Switch Kit 5111609

Part: 5111609

Price: £28.46
Ideal 172588 Mini Air Pressure Switch

Part: 172588

Price: £49.50
Ariston 571652-01 Genus Air Pressure Switch

Part: 571652-01

Price: £49.96
Main Air Pressure Switch 5112197

Part: 5112197

Price: £24.84
Ariston 60081054 Air Pressure Switch

Part: 60081054

Price: £161.60
Glowworm 0020053614 Micron Air Pressure Switch

Part: 0020053614

Price: £47.36
Potterton Pressure Switch 226060

Part: 226060

Price: £36.75
Saunier Duval S230000 Air Pressure Switch

Part: S230000

Price: £45.95
Alpha 1.016884 C23 Air Pressure Switch

Part: 1.016884

Price: £59.75
Main Pressure Switch 230068

Part: 230068

Price: £41.95
Potterton 642216 Air Pressure Switch

Part: 642216

Price: £72.68
Ferroli 39800140 Optima Air Pressure Switch

Part: 39800140

Price: £39.95
Baxi 226060 Air Pressure Switch

Part: 226060

Price: £36.75
Main Pressure Switch Pro 64220802

Part: 64220802

Price: £70.82
Main Air Pressure Switch 248466

Part: 248466

Price: £14.30
Baxi Pressure Switch Solo 70 Pf 720954301

Part: 720954301

Price: £38.47
Ideal 172589 Mini Air Pressure Switch

Part: 172589

Price: £83.24
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