Glow-worm
Glow-worm Control Thermostat S800849
2-pin control thermostat for Glow-worm Ultimate 30FF, 40FF and 50FF gas boilers, part S800849.
At a glance
- Also known as 1336467
£0.01
£0.01 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 Glow-worm S800849 is a 2-pin control thermostat used on Glow-worm Ultimate FF series gas boilers. It monitors boiler water temperature and switches the burner to hold the set point. The part is listed by Glow-worm under reference S800849.
Signs this part needs replacing
- The boiler runs but does not reach or hold the set temperature
- Heating output cycles on and off unpredictably
- No change in boiler behaviour when the thermostat control is adjusted
- Radiators or hot water run consistently hotter or cooler than the setting indicates
Before you order
- Confirm the appliance is a Glow-worm Ultimate 30FF, 40FF or 50FF
- Check the existing thermostat is a 2-pin type before ordering
- Check the appliance data badge to confirm the model
- Isolate the electrical supply to the boiler before fitting
Compliance
| Barcode / EAN | 5037985052972 |
|---|---|
| Alternative numbers | 1336467 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| GLOWWORM ULTIMATE 30FF | 41-319-56 | 41-319-56 | — | — |
| GLOWWORM ULTIMATE 40FF | 41-319-57 | 41-319-57 | — | — |
| GLOWWORM ULTIMATE 50FF | 41-319-58 | 41-319-58 | — | — |
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.
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