Description

Ariston 995903 Low Pressure Switch – Replacement

The Ariston low pressure switch 995903 helps monitor boiler water pressure to keep the heating system operating safely and efficiently. If pressure drops too low, the switch helps protect the boiler by preventing unsafe operation. However, a faulty pressure switch can cause lockouts or heating issues. Therefore, replacing it with this brand-new part helps restore reliable boiler performance and proper pressure monitoring.

Compatible Boilers

This part is compatible with the following Ariston boiler models:

ACO Series

• ACO 35 HP MFFI – GC No. 47-116-36

Challenger Series

• Challenger 80E – GC No. 47-116-05

DIA Series

• DIA 20 MFFI CE Edition 1 – GC No. 47-116-03
• DIA 20 MFFI CE Edition 2 – GC No. 47-116-03A
• DIA 24 MFFI CE Edition 1 – GC No. 47-116-04
• DIA 24 MFFI CE Edition 2 – GC No. 47-116-04A
• DIA System 27 RFFI – GC No. 41-116-02

Eco Series

• Eco Combi 27 MFFI – GC No. 47-116-23
• Eco System 27 RFFI – GC No. 41-116-08

Excalibur Series

• Excalibur 80 – GC No. 47-116-30
• Excalibur 100 – GC No. 47-116-31

Genus Series

• Genus 27 BFFI Plus Edition 1 – GC No. 47-116-11
• Genus 27 BFFI Plus Edition 2 – GC No. 47-116-11 Edition 2
• Genus 27 BFFI Plus Edition 3 – GC No. 47-116-11 Edition 3
• Genus 27 BFFI Plus Edition 4 – GC No. 47-116-11 Edition 4
• Genus 27 BFFI UK Edition 1 – GC No. 47-116-11C
• Genus 27 BFFI UK Edition 3 – GC No. 47-116-11D

Intesa Series

• Intesa 23 MFFI – GC No. 47-116-32
• Intesa 30 MFFI – GC No. 47-116-33

Microcombi Series

• Microcombi 23 MFFI Edition 1 – GC No. 47-116-16
• Microcombi 23 MFFI Edition 2 – GC No. 47-116-16 ED 2
• Microcombi 23 MFFI Edition 3 – GC No. 47-116-16 ED 3
• Microcombi 23 MFFI Edition 4 – GC No. 47-116-16 ED 4
• Microcombi 27 MFFI Edition 1 – GC No. 47-116-24
• Microcombi 27 MFFI Edition 1 Revision 1 – GC No. 47-116-24 ED 1

Microgenus Series

• Microgenus 11 24 MFFI – GC No. 47-116-25
• Microgenus 11 24 MFFI Edition 3 – GC No. 47-116-25 ED 3
• Microgenus 11 28 MFFI – GC No. 47-116-26
• Microgenus 11 28 MFFI Edition 3 – GC No. 47-116-26 ED 3
• Microgenus 11 31 MFFI – GC No. 47-116-27
• Microgenus 11 31 MFFI Edition 3 – GC No. 47-116-27 ED 3
• Microgenus HE 24MFFI – GC No. 47-116-37
• Microgenus HE 28MFFI – GC No. 47-116-38
• Microgenus HE 32MFFI – GC No. 47-116-39

Microsystem Series

• Microsystem 10 RFFI Edition 1 – GC No. 41-116-04
• Microsystem 10 RFFI Edition 2 – GC No. 41-116-04 ED 2
• Microsystem 10 RFFI Edition 3 – GC No. 41-116-04 ED 3
• Microsystem 15 RFFI Edition 1 – GC No. 41-116-05
• Microsystem 15 RFFI Edition 2 – GC No. 41-116-05 ED 2
• Microsystem 15 RFFI Edition 3 – GC No. 41-116-05 ED 3
• Microsystem 21 RFFI Edition 1 – GC No. 41-116-06
• Microsystem 21 RFFI Edition 2 – GC No. 41-116-06 ED 2
• Microsystem 21 RFFI Edition 3 – GC No. 41-116-06 ED 3
• Microsystem 28 RFFI Edition 1 – GC No. 41-116-07
• Microsystem 28 RFFI Edition 2 – GC No. 41-116-07 ED 2
• Microsystem 28 RFFI Edition 3 – GC No. 41-116-07 ED 3

SX Series

• SX 20 MFFI CE Edition 1 – GC No. 47-116-02
• SX 20 MFFI CE Edition 2 – GC No. 47-116-02A

Why Choose This Product?

This brand-new Ariston low pressure switch provides a reliable solution for restoring correct pressure monitoring and boiler safety functions. In addition, it helps reduce the risk of lockouts caused by faulty pressure detection.

Delivery and Return

Order before 1 PM for same-day dispatch with standard and next-day delivery options available. Returns are accepted within 30 days if the item remains unused and in original packaging. Always use a qualified engineer for installation.

Frequently Asked Questions

1. What does the low pressure switch do?
The switch monitors boiler water pressure and helps protect the appliance if pressure drops too low. As a result, it supports safe and reliable heating system operation.

2. What problems can a faulty pressure switch cause?
A faulty switch may cause boiler lockouts, pressure-related fault codes, or unreliable heating performance. Therefore, replacing the part can help restore normal boiler operation.

3. Is this part brand new?
Yes, this Ariston low pressure switch 995903 is supplied brand new. It is ready for direct replacement installation where compatible.

4. How do I confirm compatibility?
Always check the part number 995903 against your existing component and boiler model. This helps ensure the replacement part matches correctly.

5. Who should install this part?
A qualified heating engineer should install the component to ensure safe and correct operation. Professional installation also helps protect the heating system.