Ariston
Ariston DHW Microswitch 65121081
Wiring micro switch for the domestic hot water circuit on Ariston Eurocombi and Genus boilers.
At a glance
- Also known as 1591785
£25.68
£21.40 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Ariston DHW microswitch, part number 65121081, is a wiring micro switch for Ariston Eurocombi and Genus boilers from July 2000 onwards. It forms part of the domestic hot water circuit, where it is actuated to indicate a hot water demand to the boiler controls.
Signs this part needs replacing
- No hot water demand detected — the boiler does not fire when a hot tap is opened.
- Intermittent hot water — the boiler fires only occasionally or cuts out during a draw.
- The microswitch does not click or audibly actuate when DHW flow is triggered.
- The boiler fails to respond to hot water calls but continues to work for heating.
Before you order
- Confirm your boiler model and serial number against the fits list above.
- Check the GC number where shown to ensure correct compatibility.
- Verify the existing part number is 65121081 before ordering.
- Inspect the microswitch connector and mounting for damage.
Compliance
| Alternative numbers | 1591785 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ARISTON ARISTON EUROCOMBI A23 MFFI UK - FROM SERIAL No 2320015700001 | — | — | — | |
| ARISTON ARISTON EUROCOMBI A27 MFFI UK - FROM SERIAL No 2320015700001 | — | — | — | |
| ARISTON ARISTON GENUS 23 MFFI UK - FROM SERIAL No 2320004900093 | — | — | — | |
| ARISTON ARISTON GENUS 27 MFFI UK - FROM SERIAL No 2320004900093 | — | — | — | |
| ARISTON EUROCOMBI A23 MFFI LPG UK EDITION 1 (OCT 2007) | 47-116-10 | 47-116-10 | — | — |
| ARISTON EUROCOMBI A23 MFFI NG UK EDITION 1 (OCT 2007) | 47-116-10 | 47-116-10 | — | — |
| ARISTON EUROCOMBI A27 MFFI LPG UK EDITION 1 (OCT 2007) | 47-116-12 | 47-116-12 | — | — |
| ARISTON EUROCOMBI A27 MFFI NG UK EDITION 1 (OCT 2007) | 47-116-12 | 47-116-12 | — | — |
| ARISTON GENUS 23 MFFI UK EDITION 3 LPG (SEPT 2000) | 47-116-08 | 47-116-08 | — | — |
| ARISTON GENUS 23 MFFI UK EDITION 3 NG (SEPT 2000) | 47-116-08 | 47-116-08 | — | — |
Showing 10 of 12 compatible appliances.
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.
ARISTON appliance manual — EUROCOMBI A23 MFFI LPG UK EDITION 1 (OCT 2007) (GC 47-116-10), EUROCOMBI A23 MFFI NG UK EDITION 1 (OCT 2007) (GC 47-116-10), EUROCOMBI A27 MFFI LPG UK EDITION 1 (OCT 2007) (GC 47-116-12), EUROCOMBI A27 MFFI NG UK EDITION 1 (OCT 2007) (GC 47-116-12)
manualmanualARISTON appliance manual — GENUS 23 MFFI UK EDITION 3 LPG (SEPT 2000) (GC 47-116-08), GENUS 23 MFFI UK EDITION 3 NG (SEPT 2000) (GC 47-116-08), GENUS 27 MFFI UK EDITION 3 LPG (SEPT 2000) (GC 47-116-09), GENUS 27 MFFI UK EDITION 3 NG (SEPT 2000) (GC 47-116-09)
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