Glow-worm fault codes, explained.
Find your code below — each guide covers what it means, likely causes, safe checks, and when to call a Gas Safe engineer.
Glow-worm code library (107)
CONNECTION Glow-worm Fault Code Connection: Causes & Solutions ERR Glow-worm Fault Code ERR: Causes & Solutions F00 Glow-worm Fault Code F.00: Causes & Solutions F10 2 Glow-worm Fault Code F.10: Causes & Solutions F11 2 Glow-worm Fault Code F.11: Causes & Solutions F12 F91 Glow-worm Fault Code F.12 / F.91: Causes & Solutions F13 2 Glow-worm Fault Code F.13: Causes & Solutions F20 2 Glow-worm Fault Code F.20: Causes & Solutions F22 Glow-worm Fault Code F.22: Causes & Solutions F23 Glow-worm Fault Code F.23: Causes & Solutions F24 2 Glow-worm Fault Code F.24: Causes & Solutions F25 2 Glow-worm Fault Code F.25: Causes & Solutions F27 Glow-worm Fault Code F.27: Causes & Solutions F28 Glow-worm Fault Code F.28: Causes & Solutions F29 2 Glow-worm Fault Code F.29: Causes & Solutions F32 2 Glow-worm Fault Code F.32: Causes & Solutions F33 Glow-worm Fault Code F.33: Causes & Solutions F49 2 Glow-worm Fault Code F.49: Causes & Solutions F61 Glow-worm Fault Code F.61: Causes & Solutions F62 Glow-worm Fault Code F.62: Causes & Solutions F63 Glow-worm Fault Code F.63: Causes & Solutions F64 Glow-worm Fault Code F.64: Causes & Solutions F67 Glow-worm Fault Code F.67: Causes & Solutions F70 2 Glow-worm Fault Code F.70: Causes & Solutions F71 Glow-worm Fault Code F.71: Causes & Solutions F72 Glow-worm Fault Code F.72: Causes & Solutions F73 2 Glow-worm Fault Code F.73: Causes & Solutions F74 Glow-worm Fault Code F.74: Causes & Solutions F75 Glow-worm Fault Code F.75: Causes & Solutions F76 2 Glow-worm Fault Code F.76: Causes & Solutions F77 2 Glow-worm Fault Code F.77: Causes & Solutions F78 Glow-worm Fault Code F.78: Causes & Solutions F83 2 Glow-worm Fault Code F.83: Causes & Solutions F84 Glow-worm Fault Code F.84: Causes & Solutions F85 2 Glow-worm Fault Code F.85: Causes & Solutions F87 Glow-worm Fault Code F.87: Causes & Solutions F88 Glow-worm Fault Code F.88: Causes & Solutions F89 Glow-worm Fault Code F.89: Causes & Solutions F00 F10 F71 Glow-worm Fault Code F00 / F10 / F71: Causes & Solutions F01 F11 Glow-worm Fault Code F01 / F11: Causes & Solutions F1 Glow-worm Fault Code F1: Causes & Solutions F2 F3 Glow-worm Fault Code F2 / F3: Causes & Solutions F02 F12 Glow-worm Fault Code F02 / F12: Causes & Solutions F02 Glow-worm Fault Code F02: Causes & Solutions F2 Glow-worm Fault Code F2: Causes & Solutions F03 F13 F79 Glow-worm Fault Code F03 / F13 / F79: Causes & Solutions F3 Glow-worm Fault Code F3: Causes & Solutions F4 Glow-worm Fault Code F4: Causes & Solutions F05 Glow-worm Fault Code F05: Causes & Solutions F5 Glow-worm Fault Code F5: Causes & Solutions F06 Glow-worm Fault Code F06: Causes & Solutions F6 Glow-worm Fault Code F6: Causes & Solutions F7 Glow-worm Fault Code F7: Causes & Solutions F08 Glow-worm Fault Code F08: Causes & Solutions F8 Glow-worm Fault Code F8: Causes & Solutions F9 F22 Glow-worm Fault Code F9 / F22: Causes & Solutions F09 Glow-worm Fault Code F09: Causes & Solutions F9 Glow-worm Fault Code F9: Causes & Solutions F10 Glow-worm Fault Code F10: Causes & Solutions F11 Glow-worm Fault Code F11: Causes & Solutions F12 Glow-worm Fault Code F12: Causes & Solutions F13 Glow-worm Fault Code F13: Causes & Solutions F14 Glow-worm Fault Code F14: Causes & Solutions F15 Glow-worm Fault Code F15: Causes & Solutions F17 Glow-worm Fault Code F17: Causes & Solutions F18 Glow-worm Fault Code F18: Causes & Solutions F19 Glow-worm Fault Code F19: Causes & Solutions F20 Glow-worm Fault Code F20: Causes & Solutions F24 Glow-worm Fault Code F24: Causes & Solutions F25 F26 Glow-worm Fault Code F25 / F26: Causes & Solutions F25 Glow-worm Fault Code F25: Causes & Solutions F26 F77 Glow-worm Fault Code F26 / F77: Causes & Solutions F26 Glow-worm Fault Code F26: Causes & Solutions F27 F16 Glow-worm Fault Code F27 / F16: Causes & Solutions F29 Glow-worm Fault Code F29: Causes & Solutions F32 Glow-worm Fault Code F32: Causes & Solutions F43 Glow-worm Fault Code F43: Causes & Solutions F49 Glow-worm Fault Code F49: Causes & Solutions F61 F67 Glow-worm Fault Code F61-F67: Causes & Solutions F68 Glow-worm Fault Code F68: Causes & Solutions F70 Glow-worm Fault Code F70: Causes & Solutions F72 F84 Glow-worm Fault Code F72 / F84: Causes & Solutions F73 F74 Glow-worm Fault Code F73 / F74: Causes & Solutions F73 Glow-worm Fault Code F73: Causes & Solutions F76 Glow-worm Fault Code F76: Causes & Solutions F77 Glow-worm Fault Code F77: Causes & Solutions F81 Glow-worm Fault Code F81: Causes & Solutions F83 Glow-worm Fault Code F83: Causes & Solutions F85 Glow-worm Fault Code F85: Causes & Solutions F86 Glow-worm Fault Code F86: Causes & Solutions GREEN LED OFF Glow-worm Fault Code Green LED off: Causes & Solutions LOCKOUT IN 10 SECONDS Glow-worm Fault Code Lockout in 10 seconds: Causes & Solutions NO C H BUT FIRING Glow-worm Fault Code No C/H but firing: Causes & Solutions NO C H Glow-worm Fault Code No C/H: Causes & Solutions NO DHW Glow-worm Fault Code No DHW: Causes & Solutions NO DISPLAY OR ER Glow-worm Fault Code No display or ER: Causes & Solutions POOR BURNER PRESSURE Glow-worm Fault Code Poor burner pressure: Causes & Solutions RED LED FLASHING Glow-worm Fault Code Red LED flashing: Causes & Solutions RED LED ON Glow-worm Fault Code Red LED on: Causes & Solutions TEMPERATURE 30 FLASHING Glow-worm Fault Code Temperature 30 flashing: Causes & Solutions TEMPERATURE 40 FLASHING Glow-worm Fault Code Temperature 40 flashing: Causes & Solutions TEMPERATURE 50 FLASHING Glow-worm Fault Code Temperature 50 flashing: Causes & Solutions TEMPERATURE 60 FLASHING Glow-worm Fault Code Temperature 60 flashing: Causes & Solutions TEMPERATURE 70 FLASHING Glow-worm Fault Code Temperature 70 flashing: Causes & Solutions TEMPERATURE 80 FLASHING Glow-worm Fault Code Temperature 80 flashing: Causes & Solutions TEMPERATURE 90 FLASHING Glow-worm Fault Code Temperature 90 flashing: Causes & Solutions YELLOW LED FLASHING Glow-worm Fault Code Yellow LED flashing: Causes & Solutions
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