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Glowworm Boilers

Glow-worm Combi Boilers

Glow-worm combi boilers bring readily available hot water to you taps directly from the mains via a wall mounted units that require a small space and are most often located in a kitchen or bathroom and hidden within a cupboard. Glow-worm combi boilers are energy efficient units with low running costs that are ideally suited to apartments and small to medium sized houses with 1 to 2 bathrooms. Glow-worm combi boilers don’t require hot water tanks or cylinders as a regular boiler or system boiler does therefore making these Glow-worm combi boilers cheaper to install.
BoilerEfficiencyOutputWarrantyMPNBoiler Type
Glow-worm Betacom 30c Gas Combi Boiler85.7%30kW2 YearsCombi
Glow-worm Betacom2 24kW Gas Combi Boiler89%24kW2 YearsCombi
Glow-worm Betacom3 24kW Gas Combi Boiler89.2%24kW2 yearsCombi
Glow-worm Betacom3 30kW Gas Combi Boiler89.2%30kW2 yearsCombi
Glow-worm betacom4 24kW Combi gas boiler89.2%24kW5 YearsCombi
Glow-worm betacom4 30kW Combi gas boiler89.2%30kW5 YearsCombi
Glow-worm Easicom₃ 24kW Gas Combi Boiler94%24kW3 yearsCombi
Glow-worm Easicom₃ 28kW Gas Combi Boiler94%28kW3 yearsCombi
Glow-worm Energy 25kW Gas Combi Boiler89.2%25kW7 YearsCombi
Glow-worm Energy 30kW Gas Combi Boiler89.2%30kW7 YearsCombi
Glow-worm Energy 35 Store 35kW Gas Combi Boiler89.4%35kW7 YearsCombi
Glow-worm Energy 35kW Gas Combi Boiler89.2%35kW7 YearsCombi
Glow-worm Essential 24kW Gas Combi Boiler89.3%24kW3 yearsCombi
Glow-worm Essential 28kW Gas Combi Boiler89.3%28kW3 yearsCombi
Glow-worm Flexicom cx 24kW Gas Combi Boiler88.4%24kW2 YearsCombi
Glow-worm Procombi Essential 24kW Gas Combi Boiler89.2%24kW2 yearsCombi
Glow-worm Procombi Essential 28kW Gas Combi Boiler89.2%28kW2 yearsCombi
Glow-worm Procombi Essential 35kW Gas Combi Boiler89.7%35kW2 yearsCombi
Glow-worm Ultimate2 30kW Gas Combi Boiler89.2%30kW2 yearsCombi
Glow-worm Ultimate2 35kW Gas Combi Boiler89.2%35kW2 YearsCombi
Glow-worm Ultimate3 30kw Gas Combi Boiler89.6%30kW10 YearsCombi
Glow-worm Ultimate3 35kw Gas Combi Boiler89.7%35kW10 YearsCombi
Glow-worm Ultracom2 35 store 35kW Gas Combi Boiler89.4%35kW2 YearsCombi
Glow-worm Ultracom2 cxi 30kW Gas Combi Boiler89.3%30kW2 YearsCombi
Glow-worm Ultrapower 100 SXI 24kW Gas Combi Boiler89.2%24kW2 YearsCombi
Glow-worm Xtramax HE 28kW Gas Combi Boiler89.2%28kW3 YearsCombi

Glow-worm System Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Glow-worm Easicom 25s Gas System Boiler94%25kW3 yearsSystem
Glow-worm Easicom3 25s Gas System Boiler89.7%25kW4 yearsSystem
Glow-worm Energy 12kW Gas System Boiler89.3%12kW7 YearsSystem
Glow-worm Energy 15kW Gas System Boiler89.3%15kW7 YearsSystem
Glow-worm Energy 18kW Gas System Boiler89.3%18kW7 yearsSystem
Glow-worm Energy 25kW Gas System Boiler89.3%25kW7 yearsSystem
Glow-worm Energy 30kW Gas System Boiler89.3%30kW7 yearsSystem
Glow-worm Ultimate2 25kW Gas System Boiler89.3%25kW5 YearsSystem
Glow-worm Ultimate3 25kW Gas System Boiler89.7%25kW5 YearsSystem

Glow-worm Regular Boilers

BoilerEfficiencyOutputWarrantyMPNBoiler Type
Glow-worm Easicom3 25kW Gas Regular Boiler89.6%25kW5 YearsRegular
Glow-worm Energy 12kW Gas Regular Boiler89.3%12kW7 yearsRegular
Glow-worm Energy 15kW Gas Regular Boiler89.3%15kW7 yearsRegular
Glow-worm Energy 18kW Gas RegularBoiler89.3%18kW7 yearsRegular
Glow-worm Energy 25kW Gas Regular Boiler89.2%25kW7 yearsRegular
Glow-worm Flexicom hx 24kW Gas Regular Boiler88.4%24kW,5 YearsRegular
Glow-worm Ultimate2 Regular 25kW Gas Regular Boiler89.3%25kW5 YearsRegular
Glow-worm Ultimate3 25kW Gas Regular Boiler89.6%25kW5 YearsRegular
Glow-worm Ultracom 24 hxi Gas Regular Boiler88.4%30kW5 yearsRegular
Boiler Model Fault Code Cause of Problem
Betacom Red LED on Lockout – low water pressure (increase pressure to 1.5bar) and reset boiler
Betacom Red LED flashing Overheat – check both overheat stats
Betacom Yellow LED flashing Turn domestic hot water (DHW) control knob into temperature range and turn central heating (CH) temperature control knob into power (reset position) and wait for minimum of 30 seconds before turning into either summer or temperature position
Betacom Yellow LED on Flame present on the burner
Betacom Green LED on Boiler ready for operation
Betacom Green LED off No power to boiler – Check for 230volts into the appliance, check fuse on printed circuit board (PCB)
Betacom / Ultracom₂ cxi / sxi / 35 F00 / F10 / F71 Flow heating temperature sensor fault
Betacom / Ultracom₂ cxi / sxi / 35 F01 / F11 Return heating temperature sensor fault
Betacom / Ultracom₂ cxi / sxi / 35 F20 Overheating fault
Betacom / Ultracom₂ cxi / sxi / hxi / 35 / Flexicom cx / hx / sx F9 / F22 Low water pressure (or ignition temperature rise too slow)
Betacom / Ultracom₂ cxi / sxi / 35 F26 / F77 Fault in gas valve
Betacom / Ultracom₂ cxi / sxi / 35 / CI / hxi / Xtramax HE F27 / F16 Flame detection fault
All Boilers F28 / F1 / F4 Ignition fault (flame detection)
Betacom / Ultracom₂ cxi / sxi / 35 F29 Loss of flame during operation
Betacom / Ultracom₂ cxi / sxi / 35 F32 Incorrect air pressure
Betacom / Ultracom₂ cxi / sxi / 35 F49 EBUS voltage fault
Betacom / Ultracom₂ cxi / sxi / 35 F61 / F62 / F63 / F64 / F65 / F67 Fault in the main board
Betacom / Ultracom₂ cxi / sxi / 35 F68 Fluctuation of flame signal
Betacom / Ultracom₂ cxi / sxi / 35 F70 User interface incompatible with the main board
Betacom / Ultracom₂ cxi / sxi / 35 F72 / F84 Permanent temperature difference between flow and return heating sensors
Betacom / Ultracom₂ cxi / sxi / 35 F73 / F74 Heating circuit pressure sensor fault
Betacom / Ultracom₂ cxi / sxi / 35 F76 Thermal fuse fault
Betacom / Ultracom₂ cxi / sxi / 35 F83 Thermal fuse fault
Betacom / Ultracom₂ cxi / sxi / 35 F85 Flow and Return heating sensor fault
Betacom / Ultracom₂ cxi / sxi / 35 F86 Underfloor heating contact fault
All Boilers ERR / F12 / F18 User interface fault
Betacom c Temperature 30 flashing Fault on central heating (CH) thermistor
Betacom c Temperature 40 flashing Fault on DHW thermistor
Betacom c Temperature 50 flashing Fault on outside sensor
Betacom c Temperature 60 flashing Low system pressure
Betacom c Temperature 70 flashing Fault on APS
Betacom c Temperature 80 flashing Overheat open circuit
Betacom c Temperature 90 flashing Flame or gas failure
Compact e / s No DHW Check dhw microswitch / Check external controls, Please test for 230V on switch live contact
Compact e / s No C/H Check dhw microswitch if dhw demand led is lit / Check external controls, Please test for 230V on switch live contact
Compact e / s No C/H but boiler is firing Check divertor motor and cartridge / Check external controls, Please test for 230V on switch live contact
Compact e / s Boiler locks out within 10 seconds Check pump proving switch, air pressure switch and overheat state / Check pump proving switch, air pressure switch and overheat stat
Compact e / s Poor burner pressure Check burner pressure/ignition adjustment pots on PCB
Ci Range (plus) / Si range F2 Fan/APS
All Boilers F5 Overheat Fault
All Boilers F6 Central heating flow thermistor
All Boilers F7 Domestic hot water thermistor
All Boilers F8 Tank thermistor fault
sxi / si / ci (plus) range / Xtramax HE F9 Water pressure sensor fault (please contact GW technical department for further information)
All boilers F10 Central return flow thermistor
All boilers F11 Main board connection fault
Ci (plus) / cxi / hxi / si / sxi range F12 Connection fault between main printed circtuit board (PCB) and display PCB
Ci (plus) / cxi / hxi / si / sxi range F13 Main pcb connection fault
Ci (plus) / cxi / hxi / si / sxi range F14 Central heating flow temperature > 95 degrees
Ci (plus) / cxi / si / sxi range F15 Gas valve stepper motor fault
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F17 Power supply is less than 170v
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F19 Central heating thermistor unplugged
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F20 Software incompatibility
cxi / hxi / sxi range / Flexicom cx F24 Central heating return temperature > 90 degrees
cxi / hxi / sxi / Xtrafast 96/120 / Xtrafast 96/120E1 F25 / F26 / F11 Poor circulation
ci range F3 Air fault
ci range F3 Air fault
cxi / sxi / hxi range/ Xtramax HE F2 / F3 Fan
cxi / sxi range / Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi / Ultrapower sxi F3 Fan unable to reach ignition speed
Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi F9 Water pressure sensor fault, blocked flow filter or pump fault
Flexicom cx / hx / sx F11 Flow and or return thermistor fault
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F13 PCB memory or sensing fault
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F14 Gas valve control defective
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F15 E-bus voltage failure
All boilers F25 / F23 Circulation fault
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F43 Generic error
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F70 Software incompatible
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F73 Unable to see pump activate
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F77 Condensate pump error (optional)
hxi range F9 Earlier models only (please contact GW technical department for further information)
hxi range F9 Earlier models only (please contact GW technical department for further information)
Ultracom₂ 35 Store F02 / F12 Hot water temperature sensor fault
Ultracom₂ 35 Store F03 / F13 / F79 Storage tank temperature sensor fault
Ultracom₂ 35 Store F81 Overheating of hot water circuit
All Ultracom No display or Er loose connection X51
Xtramax HE Range F24 Cental heating return temperature > 90 degrees
Xtramax HE Range F25 Maximum temperature rise slope
Xtramax HE Range F26 Maximum delta temperature
Xtrafast 96/120 Range F00 No fault/td>
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F00 No fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F02 Air flow fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F05 Overheating
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F06 Central heating thermistor/wiring fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F08 Storage vessel thermistor/wiring fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F09 System pressure sensor fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F10 Fan fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F13 Main printed circuit board (PCB) fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F14 Central heating flow temperature > 97 degrees
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F15 Gas mechanism fault
Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F20 Communication fault
Fault Code Cause of Problem
F.00 Flow temperature sensor
F.00 Flow temperature sensor
F.10 Flow temperature sensor short circuit
F.11 Flow temperature sensor short circuit
F.12 and F.91 Cylinder temperature sensor short circuit
F.13 Domestic hot water cylinder temperature sensor short circuit
F.20 Safety switch-off – overheating temperature reached
F.22 Safety switch-off – low water pressure in the boiler
F.23 Safety switch-off – temperature difference too great (NTC1/NTC2)
F.24 Safety switch-off – temperature rise too fast
F.25 Safety switch-off – flue gas temperature too high
F.27 Safety switch-off – fault in flame detection
F.28 Ignition unsuccessful when starting up
F.29 Flame loss
F.32 Fan frost protection function active – fan speed outside the tolerance values
F.33 Fan frost protection function active – air pressure switch fault
FA9 eBUS fault – voltage too low
F.61 Gas valve control system fault
F.82 Gas valve switch-off control fault
F.83 EEPROM fault – electronics defective
F.64 Electronics/sensor/analogue-to-digital converter fault
F.85 Electronics temperature too high
F.67 Value sent back by ASIC is incorrect (flame slgnal)
F.88 Unstable flame (analogue input), underfloor heating contact or gas valve fault
F.70 Invalid product code (DSN)
F.71 Flow/return temperature sensor
F.72 Deviation in the water pressure sensor/return temperature sensor
F.73 Water pressure sensor not connected or has short-circuited
F.74 Electrical problem in the water pressure sensor
F.75 Pressure sensor fault
F.78 The safety cut-out in the primary heat exchanger is defective
F.77 Fault: Condensate or smoke
F.78 Interruption to domestic hot water (DHW) outlet sensor at external controller
F.83 Burner temperature sensor fault
F.84 Flow/return temperature sensor fault
F.85 Temperature sensor fault
F.87 Electrodes fault
F.89 Pump fault
Connection No communication between the printed circuit board (PCB) and the user interface