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.

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Main Air Pressure Switch 5137532

Part: 5137532

Price: £32.93
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Worcester Bosch 87161165410 28Cdi 24Sbi Air Pressure Switch

Part: 87161165410

Price: £28.27
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Main Air Pressure Switch 248466

Part: 248466

Price: £14.30
images/products/Potterton_Air_Pr_4ec6714158faa
Potterton Suprima 30He Air Pressure Switch 5112195

Part: 5112195

Price: £24.84
images/products/Saunier_Duval_Ai_503643890ff9f
Saunier Duval S230357 Air Pressure Switch

Part: S230357

Price: £52.62
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Potterton 642237 Air Pressure Switch

Part: 642237

Price: £51.82
images/products/Biasi_Air_Pressu_4e775fd01b823
Biasi BI1376104 Garda HE, Riva Compact HE Air Pressure Switch

Part: BI1376104

Price: £45.55
images/products/Ariston__Air_Pre_50191f082c22a
Ariston 998484-01 Microcombi Air Pressure Switch

Part: 998484-01

Price: £36.34
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Main Pressure Switch 642220

Part: 642220

Price: £57.06
images/products/Air_Pressure_Swi_50e6a17de8c1d9
Ravenheat Air Pressure Switch 0005PRE06006/0

Part: 0005PRE06006/0

Price: £49.95
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Ideal 173249 Mini C28, C32 Air Pressure Switch

Part: 173249

Price: £78.96
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Main Switch 226060

Part: 226060

Price: £36.75
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Worcester Bosch 87161461560 15 Sbi Air Pressure Switch

Part: 87161461560

Price: £24.37
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Baxi 5137530 Combi 105He, Instant He Air Pressure Switch

Part: 5137530

Price: £32.97
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Main Air Pressure Switch 5137529

Part: 5137529

Price: £32.98
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Ariston 60081054 Air Pressure Switch

Part: 60081054

Price: £161.60
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Heatline D003200136 Compact Air Pressure Switch

Part: D003200136

Price: £61.17
226060
Potterton Pressure Switch 226060

Part: 226060

Price: £36.75
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Biasi BI1036102 Parva Garda Air Pressure Switch

Part: BI1036102

Price: £49.69
720011401
Potterton Pressure Switch 720011401

Part: 720011401

Price: £56.16
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Saunier Duval S227097 Air Pressure Switch

Part: S227097

Price: £41.54
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Biasi BI1016106 24S Air Pressure Switch

Part: BI1016106

Price: £49.69
248466
Potterton Pressure Switch 248466

Part: 248466

Price: £14.23
images/products/Glow_worm_Air_Pr_501aa097bd205
Glowworm 0020053616 Micron Air Pressure Switch

Part: 0020053616

Price: £46.43
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Saunier Duval Air Pressure Switch 0020064569

Part: 0020064569

Price: £45.67
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Glowworm 0020064569 Micron 70Ff Air Pressure Switch

Part: 0020064569

Price: £45.67
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Main Pressure Switch 642223

Part: 642223

Price: £56.57
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Potterton Pressure Switch 230068

Part: 230068

Price: £41.95
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Ideal 171454 Classic Air Pressure Switch

Part: 171454

Price: £68.25
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Ideal 172588 Mini Air Pressure Switch

Part: 172588

Price: £49.50
images/products/Glow_worm_Air_Pr_50dedd43cac69
Saunier Duval S202135 Air Pressure Switch

Part: S202135

Price: £49.95
images/products/Glow_worm_Air_Pr_5036435e8c01b
Glowworm S230357 Economy, Fuelsaver Air Pressure Switch

Part: S230357

Price: £52.62
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Worcester Bosch 87161424060 24Cdi Air Pressure Switch

Part: 87161424060

Price: £24.21
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Main Air Pressure Switch 5112198

Part: 5112198

Price: £24.84
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Alpha 1.8396 Air Pressure Switch

Part: 1.8396

Price: £45.00
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Potterton 5105575 Suprima 40L Air Pressure Switch

Part: 5105575

Price: £63.36
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Ariston 571653-01 Microsystem 28RFFI Air Pressure Switch

Part: 571653-01

Price: £47.67
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Heatline D003200032 Compact Air Pressure Switch

Part: D003200032

Price: £86.70
images/products/Baxi_Air_Pressur_4f33e0ab1feb8
Main Air Pressure Switch 642481

Part: 642481

Price: £78.66
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Ideal 173236 Mini He Air Pressure Switch

Part: 173236

Price: £78.96
images/products/Potterton_Contro_4fb4eaa9c9618
Potterton 5111408 Control Unit

Part: 5111408

Price: £461.42
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Biasi BI1036103 Prisma 28Se Air Pressure Switch

Part: BI1036103

Price: £49.69
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Baxi 230068 Solo 2 Air Pressure Switch

Part: 230068

Price: £41.95
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Chaffoteaux 61306697-01 Britony Air Pressure Switch

Part: 61306697-01

Price: £49.24
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Main Fan Pressure Switch- 5137530

Part: 5137530

Price: £32.97
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Halstead 500592 Ace, Finest Air Pressure Switch

Part: 500592

Price: £62.06
images/products/Glow_worm__Air_P_4f635ce55d8fc
Glowworm S202232 Ultimate Micron Air Pressure Switch

Part: S202232

Price: £51.63
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Potterton 642216 Air Pressure Switch

Part: 642216

Price: £72.68
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Worcester Bosch 87161044610 24I Junior (Huba) Air Pressure Switch

Part: 87161044610

Price: £33.75
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Main Air Pressure Switch Kit 246055

Part: 246055

Price: £39.99
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