PartsByCodespare parts by code

Low Water Pressure Switch - DIA/Microgenus/Microsystem

Part number (MPN)
995903
Check compatibility

Type your appliance model: we compare it with the 38 appliances in our sources.

Catalogue numberChecked sources
Direct linkseBay and Amazon
Free to useNo sign-up

Parts for the same appliances

OEM Replacement Part & Compatibility Table

Brand
Guide price (£)
Not available: check the current price with the seller
Source
retailer parts list
checked 2026-11-06
Fitting notes

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

Compatible appliances

Always check the model and serial number on the data plate before ordering.

Frequently asked questions

Which appliances does 995903 fit?

The sources we checked list 995903 (Low Water Pressure Switch - DIA/Microgenus/Microsystem, Ariston) for: 20/1 MFS from serial no. N0000, Ariston ACO 35 Hp Mffi, Ariston ACO Floor 35, ACO FLOOR 35 SYSTEM NG, CHALLENGER 80 E COMBI NG, Ariston Ecocombi 27 MFFI, Ariston Excalibur 100, Ariston Excalibur 80, GENUS 27 PLUS ED 3 COMBI NG, Ariston Genus 27 Bffi Plus, Ariston Genus 27 Bffi UK, Ariston Intesa TP 23 Mffi, Ariston Intesa TP 30 Mffi, Ariston Microsystem 10 RFFI, Ariston Microsystem 15 RFFI, Ariston Microsystem 21 RFFI, Ariston Microsystem 28 RFFI, Ariston Sx 20 Mffi Ce, DIA 20 MFFI CE from serial no, DIA 20 MFFI CE LPG from serial, DIA 24 MFFI CE from serial no, DIA 24 MFFI CE LPG from serial, DIA SYSTEM 27 RFFI from serial, DIA SYSTEM 27 RFFI LPG from se, ECOCOMBI 27 MFFI COMBI NG, ECOSYSTEM 27 RFFI from serial, MICROCOMBI 23 MFFI from serial, MICROCOMBI 27 MFFI from serial, MICROGENUS 32 MFFI HE from ser, MICROGENUS HE 24 MFFI COMBI NG, MICROGENUS HE 28 MFFI COMBI NG, MICROGENUS II 24 MFFI COMBI NG, MICROGENUS II 28 MFFI COMBI NG, MICROGENUS II 31 MFFI COMBI NG, MICROSYSTEM 10 RFFI from seria, MICROSYSTEM 15 RFFI from seria, MICROSYSTEM 21 RFFI SYSTEM NG, MICROSYSTEM 28 RFFI SYSTEM NG. Always check the model and serial number on the data plate before ordering.

Does 995903 have equivalent or superseded part numbers?

The sources we checked list no equivalents for 995903. Ask a Ariston stockist to confirm.

What should I check before fitting 995903?

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

View on eBay

Some lists are dated and the part may have been superseded. Information only, compatibility not guaranteed.