Glow-worm Betacom Fault Codes
The Glow-worm Betacom (and later Betacom⁴) was the brand's budget compact combi — a small, simple, keenly priced boiler installed in great numbers in flats, rentals and starter homes through the 2010s. It uses a compact F-code set on a simple display: low single-digit and low-double-digit F-numbers covering ignition failure, flame loss, fan and sensor faults, overheat and pressure. Most Betacoms are now into double-digit ages, and their diagnostic context is that of a hard-working budget veteran: the faults that arrive are wear faults, parts remain cheap and available, and the repair-or-replace question deserves honest arithmetic once bills approach the boiler's value. The codes below link to their full pages — exact meanings can vary between Betacom generations, so treat the linked page (and your model's manual) as authoritative for your boiler year.
Where Betacom fault codes appear
The Betacom has a small, simple display (with indicator LEDs on some versions) showing an F-prefixed code on faults. On the oldest examples the display is terse — note exactly what shows, and your boiler's specific model (Betacom 24, 30, Betacom⁴ etc.) helps any engineer date the code scheme.
Resetting a Glow-worm Betacom
Press the reset button and hold briefly; the boiler retries. Pressure faults want the system topped up to about 1–1.5 bar via the filling loop first. On a boiler of this age and class, a code that returns after one reset has earned a proper diagnosis — and if quotes mount, an honest conversation about replacement.
Common Betacom problems
Ageing Betacoms mostly present ignition lockouts (electrodes and gas-valve wear, plus the universal winter condensate freeze), pressure loss on tired sealed systems, and fan and thermistor failures of honest old age. None of it is exotic; the judgement call is economic. A well-serviced Betacom can soldier on cheaply — an unserviced one at 15 years is usually telling you something.
Most common Betacom fault codes
- F1 The F1 code appears on Glow Worm boilers when the boiler has attempted to light itself… Read more →
- F2 The F2 fault code on Glow-Worm boilers indicates a problem with the combustion fan — the… Read more →
- F3 The F3 code means your Glow-Worm boiler has detected that its fan is not spinning fast… Read more →
- F4 The F4 code means your Glow-Worm boiler has failed to detect a flame during the ignition… Read more →
- F9 The F9 fault code on a Glow-Worm boiler indicates that the boiler's control board has… Read more →
- F13 The F13 code appears on Glow-Worm boilers when the main PCB detects a problem with its… Read more →