Thermocouple
Glow-worm gas fire thermocouple S900004 (T127-300/M8)
Pilot thermocouple listed as a Glow-worm Fireblaze, Flamenco and Revival type replacement, manufacturer part S900004.
At a glance
- Also known as 1700635
- Gas Safe registered engineer required for fitting
£21.80
£18.17 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
A pilot-flame safety thermocouple sold as a Glow-worm type replacement, referenced under manufacturer part number S900004 and catalogue code T127-300/M8. It sits in the pilot flame and generates a small millivolt signal that holds the fire's gas valve open, cutting the gas supply automatically if the pilot goes out.
Signs this part needs replacing
- Pilot light won't stay lit once the control knob is released
- Main burner won't ignite despite a visible pilot flame
- Weak or unstable millivolt reading on test
- Corrosion, scorching or a damaged lead
Before you order
- Match the part number on your existing thermocouple against S900004
- Isolate the gas supply before removing the old thermocouple
- Confirm your fire model (Fireblaze/Flamenco/Revival) if unsure
- Gas Safe registered engineer required for fitting
Compliance
| Alternative numbers | 1700635 |
|---|
No fitment data held for this part.
Documents & drawings
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No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
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