Description
Ariston 998458 Temperature Probe Sensor (Now Use 998458-01)
The Ariston 998458 Temperature Probe is a replacement boiler sensor designed for a wide range of Ariston heating appliances.
This part has been updated by the manufacturer and is now replaced by 998458-01.
The temperature probe monitors water temperature within the boiler and helps ensure safe and efficient heating and hot water operation.
A faulty sensor can cause inaccurate temperature readings, heating issues or boiler fault codes. Replacing the probe can help restore correct boiler performance.
Compatible Boilers
Ariston ACO Series
- ACO 27 MFFI – GC No. 47-116-34
- ACO 32 MFFI – GC No. 47-116-35
- ACO 35 HP MFFI – GC No. 47-116-36
Ariston DIA Series
- DIA 20 MFFI CE – GC No. 47-116-03
- DIA 24 MFFI CE – GC No. 47-116-04
- DIA System 27 RFFI – GC No. 41-116-02
Ariston Eco & Ecogenus Series
- Eco Combi 27 MFFI – GC No. 47-116-23
- Ecogenus 24 MFFI – GC No. 47-116-17
- Ecogenus 24 RFFI System – GC No. 41-116-03
Ariston Eurocombi Series
- Eurocombi A23 MFFI – GC No. 47-116-10
- Eurocombi A27 MFFI – GC No. 47-116-12
Ariston Excalibur Series
- Excalibur 80 – GC No. 47-116-30
- Excalibur 100 – GC No. 47-116-31
Ariston Genus Series
- Genus 23 MFFI UK – GC No. 47-116-08
- Genus 27 BFFI Plus – GC No. 47-116-11
- Genus 27 MFFI UK – GC No. 47-116-09
- Genus 27 RFFI System – GC No. 41-116-01
- Genus 30 MFFI UK – GC No. 47-116-13
Ariston Intesa Series
- Intesa 23 MFFI – GC No. 47-116-32
- Intesa 30 MFFI – GC No. 47-116-33
Ariston Microcombi Series
- Microcombi 23 MFFI – GC No. 47-116-16
- Microcombi 27 MFFI – GC No. 47-116-24
Ariston Microgenus Series
- Microgenus 11 24 MFFI – GC No. 47-116-25
- Microgenus 11 28 MFFI – GC No. 47-116-26
- Microgenus 11 31 MFFI – GC No. 47-116-27
- Microgenus 23 MFFI – GC No. 47-116-14
- Microgenus 27 MFFI – GC No. 47-116-15
- Microgenus HE 24MFFI – GC No. 47-116-37
- Microgenus HE 28MFFI – GC No. 47-116-38
- Microgenus HE 32MFFI – GC No. 47-116-39
Always verify compatibility using your boiler’s full model number and GC number before ordering. If you’re unsure, our technical support team is happy to help.
Why Buy From Heating and Catering Parts?
- Fast UK dispatch — order before 2pm for same-day shipping from our UK warehouse
- 12-month warranty on every part for complete peace of mind
- Expert technical support team to confirm compatibility before you order
- Hassle-free 30-day returns — wrong part? We’ll sort it quickly
- Trusted by Gas Safe engineers and domestic customers across the UK





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