Ariston
Ariston Low Water Pressure Switch 995903
Ariston 995903 low water pressure switch for DIA, Microgenus and Microsystem gas boilers, supplied as a pressure switch part.
At a glance
- Part type: Pressure switch
- Also known as N0321-B
Showing prices
£18.00
£15.00 ex. VAT · VAT at 20%
Out of stock — order for next delivery
Call 01302 279234 to check availability
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Ariston 995903 Low Water Pressure Switch is a pressure switch classed as a pressure switch part for Ariston gas boilers in the DIA, Microgenus and Microsystem ranges. It monitors the water pressure in the heating circuit and signals the boiler's control system when pressure falls below the safe operating level.
Before you order
- Check the boiler model, edition and fuel type (LPG or natural gas) against the fit list before ordering.
- Confirm the existing switch's part number or markings match 995903.
- Check the fitment for your specific appliance, as some models are listed with multiple editions.
Compliance
| Alternative numbers | N0321-B |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ARISTON ACO 35 HP MFFI UK | 47-116-35 | 47-116-35 | — | — |
| ARISTON ACO FLOOR 35 | 41-116-18 | 41-116-18 | — | — |
| ARISTON CHALLENGER 80E | 47-116-05 | 47-116-05 | — | — |
| ARISTON DIA 20 MFFI CE UK LPG | 47-116-03 | 47-116-03 | — | — |
| ARISTON DIA 20 MFFI CE UK MET | 47-116-03 | 47-116-03 | — | — |
| ARISTON DIA 20 MI CE UK LPG | — | — | — | |
| ARISTON DIA 20 MI CE UK MET | — | — | — | |
| ARISTON DIA 24 MFFI CE UK LPG | 47-116-04 | 47-116-04 | — | — |
| ARISTON DIA 24 MFFI CE UK MET | 47-116-04 | 47-116-04 | — | — |
| ARISTON DIA 24 MI CE UK LPG | — | — | — |
Showing 10 of 110 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
manual
ARISTON appliance manual — ACO 35 HP MFFI UK (GC 47-116-35)
manualmanualARISTON appliance manual — CHALLENGER 80E (GC 47-116-05)
manualmanualARISTON appliance manual — DIA 20 MFFI CE UK LPG (GC 47-116-03), DIA 20 MFFI CE UK MET (GC 47-116-03), DIA 24 MFFI CE UK LPG (GC 47-116-04), DIA 24 MFFI CE UK MET (GC 47-116-04)
manualmanualARISTON appliance manual — DIA 20 MI CE UK LPG, DIA 20 MI CE UK MET, DIA 24 MI CE UK LPG, DIA 24 MI CE UK MET
manualmanualARISTON appliance manual — DIA SYSTEM 27 RFFI LPG, DIA SYSTEM 27 RFFI MET (GC 41-116-02)
manualmanualARISTON appliance manual — ECOCOMBI 27 MFFI LPG EDITION 1 (OCT 2002) (GC 47-116-23), ECOCOMBI 27 MFFI LPG EDITION 2 (SEPT 2004) (GC 47-116-23), ECOCOMBI 27 MFFI NG EDITION 1 (OCT 2002) (GC 47-116-23), ECOCOMBI 27 MFFI NG EDITION 2 (SEPT 2004) (GC 47-116-23), ECOSYSTEM 27 RFFI EDITION 1 LPG (OCT 2002) (GC 41-116-08), ECOSYSTEM 27 RFFI EDITION 1 NG (OCT 2002) (GC 41-116-08), ECOSYSTEM 27 RFFI EDITION 2 LPG (SEPT 2004) (GC 41-116-08), ECOSYSTEM 27 RFFI EDITION 2 NG (SEPT 2004) (GC 41-116-08)
manualmanualARISTON appliance manual — GENUS 27 BFFI PLUS LPG EDITION 1 (MAY 2000) (GC 47-116-11), GENUS 27 BFFI PLUS LPG EDITION 2 (OCT 2000) (GC 47-116-11), GENUS 27 BFFI PLUS LPG EDITION 3 (MAY 2001) (GC 47-116-11), GENUS 27 BFFI PLUS LPG EDITION 4 (OCT 2003) (GC 47-116-11), GENUS 27 BFFI PLUS NG EDITION 1 (MAY 2000) (GC 47-116-11), GENUS 27 BFFI PLUS NG EDITION 2 (OCT 2000) (GC 47-116-11), GENUS 27 BFFI PLUS NG EDITION 3 (MAY 2001) (GC 47-116-11), GENUS 27 BFFI PLUS NG EDITION 4 (OCT 2003) (GC 47-116-11)
manualmanualARISTON appliance manual — GENUS 27 BFFI UK LPG EDITION 2 (JUN 1998) (GC 47-116-11), GENUS 27 BFFI UK LPG EDITION 3 (DEC 2000) (GC 47-116-11), GENUS 27 BFFI UK NG EDITION 2 (JUN 1998) (GC 47-116-11), GENUS 27 BFFI UK NG EDITION 3 (DEC 2000) (GC 47-116-11)
manualmanualARISTON appliance manual — INTESA 24 MFFI LPG, INTESA 24 MFFI NG (GC 47-116-32), INTESA 30 MFFI LPG, INTESA 30 MFFI NG (GC 47-116-33), TRAVIS PERKINS 24 MFFI LPG, TRAVIS PERKINS 24 MFFI NG, TRAVIS PERKINS 30 MFFI LPG, TRAVIS PERKINS 30 MFFI NG
manualmanualARISTON appliance manual — MICROCOMBI 23 MFFI LPG EDITION 1 (OCT 2000) (GC 47-116-16), MICROCOMBI 23 MFFI LPG EDITION 2 (DEC 2000) (GC 47-116-16), MICROCOMBI 23 MFFI LPG EDITION 3 (FEB 2001) (GC 47-116-16), MICROCOMBI 23 MFFI NG EDITION 1 (OCT 2000) (GC 47-116-16), MICROCOMBI 23 MFFI NG EDITION 2 (DEC 2000) (GC 47-116-16), MICROCOMBI 23 MFFI NG EDITION 3 (FEB 2001) (GC 47-116-16), MICROCOMBI 23 MFFI NG EDITION 4 (APR 2002) (GC 47-116-16), MICROCOMBI 28 MFFI LPG EDITION 1 (APR 2003) (GC 47-116-24), MICROCOMBI 28 MFFI NG EDITION 1 (APR 2003) (GC 47-116-24)
manualmanualARISTON appliance manual — MICROGENUS 24 MFFI HE UK NG (GC 47-116-37), MICROGENUS 28 MFFI HE UK LPG (GC 47-116-38), MICROGENUS 32 MFFI HE UK NG (GC 47-116-39)
manualmanualARISTON appliance manual — MICROGENUS II 24 MFFI UK LPG, MICROGENUS II 24 MFFI UK MET (GC 47-116-25), MICROGENUS II 28 MFFI UK LPG, MICROGENUS II 28 MFFI UK MET (GC 47-116-26), MICROGENUS II 31 MFFI UK LPG (GC 47-116-27), MICROGENUS II 31 MFFI UK MET (GC 47-116-27)
manualmanualARISTON appliance manual — MICROSYSTEM 10 RFFI LPG EDITION 1 (AUG 2000) (GC 41-116-04), MICROSYSTEM 10 RFFI LPG EDITION 2 (FEB 2001) (GC 41-116-04), MICROSYSTEM 10 RFFI LPG EDITION 3 (FEB 2004) (GC 41-116-04), MICROSYSTEM 10 RFFI LPG EDITION 4 (SEPT 2004) (GC 41-116-04), MICROSYSTEM 10 RFFI NG EDITION 1 (AUG 2000) (GC 41-116-04), MICROSYSTEM 10 RFFI NG EDITION 2 (FEB 2001) (GC 41-116-04), MICROSYSTEM 10 RFFI NG EDITION 3 (FEB 2004) (GC 41-116-04), MICROSYSTEM 10 RFFI NG EDITION 4 (SEPT 2004) (GC 41-116-04)
manualmanualARISTON appliance manual — MICROSYSTEM 15 RFFI LPG EDITION 1 (AUG 2000) (GC 41-116-05), MICROSYSTEM 15 RFFI LPG EDITION 2 (FEB 2001) (GC 41-116-05), MICROSYSTEM 15 RFFI LPG EDITION 3 (FEB 2004) (GC 41-116-05), MICROSYSTEM 15 RFFI LPG EDITION 4 (SEPT 2004) (GC 41-116-05), MICROSYSTEM 15 RFFI NG EDITION 1 (AUG 2000) (GC 41-116-05), MICROSYSTEM 15 RFFI NG EDITION 2 (FEB 2001) (GC 41-116-05), MICROSYSTEM 15 RFFI NG EDITION 3 (FEB 2004) (GC 41-116-05), MICROSYSTEM 15 RFFI NG EDITION 4 (SEPT 2004) (GC 41-116-05)
manualmanualARISTON appliance manual — MICROSYSTEM 21 RFFI LPG EDITION 1 (AUG 2000) (GC 41-116-06), MICROSYSTEM 21 RFFI LPG EDITION 2 (JAN 2004) (GC 41-116-06), MICROSYSTEM 21 RFFI LPG EDITION 3 (SEPT 2004) (GC 41-116-06), MICROSYSTEM 21 RFFI NG EDITION 1 (AUG 2000) (GC 41-116-06), MICROSYSTEM 21 RFFI NG EDITION 2 (JAN 2004) (GC 41-116-06), MICROSYSTEM 21 RFFI NG EDITION 3 (SEPT 2004) (GC 41-116-06), MICROSYSTEM 28 RFFI LPG EDITION 1 (AUG 2000) (GC 41-116-07), MICROSYSTEM 28 RFFI LPG EDITION 2 (JAN 2004) (GC 41-116-07), MICROSYSTEM 28 RFFI LPG EDITION 3 (SEPT 2004) (GC 41-116-07), MICROSYSTEM 28 RFFI NG EDITION 1 (AUG 2000) (GC 41-116-07), MICROSYSTEM 28 RFFI NG EDITION 2 (JAN 2004) (GC 41-116-07), MICROSYSTEM 28 RFFI NG EDITION 3 (SEPT 2004) (GC 41-116-07)
manualmanualARISTON appliance manual — SX 20 MFFI CE LPG PROG. MEC EDITION 1 (JULY 2007), SX 20 MFFI CE NG PROG. MEC EDITION 1 (JULY 2007) (GC 47-116-02)
manualmanualINTESA appliance manual — TP 23 LPG (GC 47-116-32), TP 23 NG (GC 47-116-32), TP 30 LPG (GC 47-116-33), TP 30 NG (GC 47-116-33)
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