Glow-worm
Glow-worm Overheat Thermostat S202538
Overheat thermostat S202538 for Glow-worm KFB and Space Saver KFB boilers, Ranco LM7 P8507 type.
At a glance
- Also known as 7625873006886, GLOWWORMS202538, 1333612
£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 OVERHEAT THERMOSTAT is a safety limit device supplied by Glow-worm under part number S202538. It is a Ranco LM7 P8507 type thermostat, listed in the Thermostats category of gas boiler spares. Its role is to monitor boiler temperature and interrupt the burner circuit if the appliance overheats, protecting the heat exchanger and surrounding components from damage.
Signs this part needs replacing
- The boiler locks out or shuts down repeatedly once it reaches operating temperature
- The overheat trip operates and requires manual reset before the boiler will run again
- The appliance fires briefly then cuts out, with the fault recurring after each reset
- No heating or hot water is produced after a lockout, even with demand present
- The overheat thermostat fails to trip when the boiler runs hotter than normal
Before you order
- Confirm the boiler model against the rating plate, as the K F B and Space Saver KFB ranges share several part numbers across outputs
- Check the part number S202538 on the existing thermostat before removal
- Establish whether the fault lies with the overheat thermostat or the control thermostat, as the two are separate components
- Isolate the electrical supply and follow the manufacturer's safety guidance before working on the appliance
Compliance
| GC number | 397-894 |
|---|---|
| Alternative numbers | 7625873006886, GLOWWORMS202538, GLOWWORMS202538, 1333612 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| GLOWWORM K F B 20 | 41-319-07 | 41-319-07 | — | — |
| GLOWWORM K F B 30 | 41-319-08 | 41-319-08 | — | — |
| GLOWWORM K F B 40 | 41-319-09 | 41-319-09 | — | — |
| GLOWWORM K F B 50 | 41-319-10 | 41-319-10 | — | — |
| GLOWWORM K F B 60 | 41-319-11 | 41-319-11 | — | — |
| GLOWWORM K F B 70 | 41-319-12 | 41-319-12 | — | — |
| GLOWWORM SPACE SAVER KFB 20 | 41-319-22 | 41-319-22 | — | — |
| GLOWWORM SPACE SAVER KFB 30 | 41-319-08 | 41-319-08 | — | — |
| GLOWWORM SPACE SAVER KFB 40 | 41-319-09 | 41-319-09 | — | — |
| GLOWWORM SPACE SAVER KFB 50 | 41-319-10 | 41-319-10 | — | — |
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.
GLOWWORM appliance manual — K F B 30 (GC 41-319-08), K F B 40 (GC 41-319-09), K F B 50 (GC 41-319-10), SPACE SAVER KFB 30 (GC 41-319-08), SPACE SAVER KFB 40 (GC 41-319-09), SPACE SAVER KFB 50 (GC 41-319-10)
manualmanualGLOWWORM appliance manual — K F B 60 (GC 41-319-11), K F B 70 (GC 41-319-12), SPACE SAVER KFB 60 (GC 41-319-11), SPACE SAVER KFB 70 (GC 41-319-12)
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