Glow-worm Space Saver 30 40 50 Fault Codes

Regular Natural Gas 8.8-14.7 kW 1970s-1980s Discontinued

GC Numbers: 41-311-6641-311-6741-311-68

Replaced by: Economy Plus

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 appears to have no power reaching it, which is likely caused by an external electrical issue or a blown fuse inside the unit.	Yes
Neon 2 NOT lit	High	Your boiler has switched itself off because it has reached an unsafe temperature or a safety sensor has detected a fault.	Yes
Neon 3 NOT lit	High	Your boiler has stopped working because it cannot confirm that the internal fan is safely clearing waste gases from the system.	Engineer
Neon 4 NOT lit	High	Your boiler has failed to light the pilot flame or cannot verify that the burner is safely lit, resulting in no heating or hot water.	Engineer
neon1	High	Your boiler is not receiving the correct electrical power, meaning it cannot start the ignition process to provide heating or hot water.	Yes
neon2	High	Your boiler has likely stopped heating because it has reached an unusually high internal temperature and has shut down as a safety precaution.	Yes
neon3	High	Your boiler has detected an internal electrical communication error, meaning it cannot safely confirm the fan is working to clear waste gases.	Engineer
neon4	High	Your boiler is unable to light the pilot flame, which means it cannot fire up to provide heating or hot water.	Engineer

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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