Glow-worm Space Saver Compleheat 30 40 50 Fault Codes

Regular Natural Gas 8.8-14.7 kW 1988-1994 Discontinued

GC Numbers: 41-315-3841-315-3941-315-40

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
Neon 1 NOT lit	High	Your boiler has lost power or has insufficient water pressure to operate, meaning it cannot provide heating or hot water.	Yes
Neon 2 NOT lit	High	Your boiler has switched itself off to prevent overheating because the system is getting too hot or the water is not circulating properly.	Engineer
Neon 3 NOT lit	High	Your boiler has detected that the internal safety fan isn't moving air properly, so it has shut down for safety.	Engineer
Neon 4 NOT lit	High	Your boiler is failing to light the pilot flame or detect a steady flame, meaning it cannot start the heating process.	Engineer
Red neon on fascia illuminated	High	Your boiler has detected that the water pressure is too low to operate safely and has shut down to prevent damage.	Yes

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

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