Ferroli
Ferroli Flue Gas Sensor 39839810
Flue gas sensor (thermistor) for Ferroli gas boilers, manufacturer part number 39839810.
At a glance
- Also known as 1211807
Showing prices
£19.34
£16.12 ex. VAT · VAT at 20%
Available to order · 3 working days
Available to order · 3 working days
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 Ferroli 39839810 is a flue gas sensor (thermistor) used in Ferroli gas boilers. It monitors flue gas temperature as part of the appliance's safety and combustion control system. The manufacturer lists it as Sensor - Flue Gas 120.
Signs this part needs replacing
- Boiler locks out or fails to fire, with a flue-related fault code.
- Repeated overheat or flue temperature faults during operation.
- Intermittent shutdown or erratic modulation as flue temperature readings become unstable.
- Boiler runs for a short period then shuts down before reaching set temperature.
- Fault code indicating a flue gas sensor or thermistor error.
Before you order
- Confirm your appliance model and, where shown, the GC number against the fits list above.
- Check the existing sensor's part number or manufacturer marking matches 39839810.
- Note any version suffix (such as V2) on your boiler, as fitment can vary between versions.
- If unsure, consult the manufacturer's parts list for your exact model and serial number.
Compliance
| Alternative numbers | FER39839810, 1211807 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| FERROLI ECONCEPT 51A - 30K0728003 (01/02/2012) | — | — | — | |
| FERROLI FERROLI ECONCEPT 51 | — | — | — | |
| FERROLI FERROLI OPTIMAX HE PLUS 18 OV V2 | — | — | — | |
| FERROLI FERROLI OPTIMAX HE PLUS 25 OV | — | — | — | |
| FERROLI FERROLI OPTIMAX HE PLUS 38C V2 | — | — | — | |
| FERROLI OPTIMAX HE PLUS 18 OV - 30K0673004 (01/11/2010) | 41-267-29 | 41-267-29 | — | — |
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.
No technical questions yet for this part.
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