Glow-worm Boilers

Compare Glow-worm boilers including combi, regular and system boilers and gas, oil and electric boilers.

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Boiler Brands

ACV (5)
Alpha (42)
Ariston (32)
Atag (17)
Baxi (89)
Biasi (28)
Daikin (3)
Electric Heating Company (12)
Elnur (21)
Error Codes (1)
Ferroli (30)
Firebird (123)
Glow-worm (44)
Grant (67)
Heatrae Sadia (7)
Ideal (73)
Intergas (24)
Johnson & Starley (6)
Keston (5)
Main (12)
Mistral (113)
Navien (20)
Potterton (69)
Ravenheat (25)
Uncategorized (2)
Vaillant (59)
Viessmann (35)
Vokera (31)
Warmflow (23)
Warmhaus (12)
Worcester Bosch (95)
Zanussi (6)

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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.

Boiler	Efficiency	Output	Warranty	Boiler Type
Glow-worm Betacom 30c Gas Combi Boiler	85.7%	30kW	2 Years	Combi
Glow-worm Betacom2 24kW Gas Combi Boiler	89%	24kW	2 Years	Combi
Glow-worm Betacom3 24kW Gas Combi Boiler	89.2%	24kW	2 years	Combi
Glow-worm Betacom3 30kW Gas Combi Boiler	89.2%	30kW	2 years	Combi
Glow-worm betacom4 24kW Combi gas boiler	89.2%	24kW	5 Years	Combi
Glow-worm betacom4 30kW Combi gas boiler	89.2%	30kW	5 Years	Combi
Glow-worm Easicom₃ 24kW Gas Combi Boiler	94%	24kW	3 years	Combi
Glow-worm Easicom₃ 28kW Gas Combi Boiler	94%	28kW	3 years	Combi
Glow-worm Energy 25kW Gas Combi Boiler	89.2%	25kW	7 Years	Combi
Glow-worm Energy 30kW Gas Combi Boiler	89.2%	30kW	7 Years	Combi
Glow-worm Energy 35 Store 35kW Gas Combi Boiler	89.4%	35kW	7 Years	Combi
Glow-worm Energy 35kW Gas Combi Boiler	89.2%	35kW	7 Years	Combi
Glow-worm Essential 24kW Gas Combi Boiler	89.3%	24kW	3 years	Combi
Glow-worm Essential 28kW Gas Combi Boiler	89.3%	28kW	3 years	Combi
Glow-worm Flexicom cx 24kW Gas Combi Boiler	88.4%	24kW	2 Years	Combi
Glow-worm Procombi Essential 24kW Gas Combi Boiler	89.2%	24kW	2 years	Combi
Glow-worm Procombi Essential 28kW Gas Combi Boiler	89.2%	28kW	2 years	Combi
Glow-worm Procombi Essential 35kW Gas Combi Boiler	89.7%	35kW	2 years	Combi
Glow-worm Ultimate2 30kW Gas Combi Boiler	89.2%	30kW	2 years	Combi
Glow-worm Ultimate2 35kW Gas Combi Boiler	89.2%	35kW	2 Years	Combi
Glow-worm Ultimate3 30kw Gas Combi Boiler	89.6%	30kW	10 Years	Combi
Glow-worm Ultimate3 35kw Gas Combi Boiler	89.7%	35kW	10 Years	Combi
Glow-worm Ultracom2 35 store 35kW Gas Combi Boiler	89.4%	35kW	2 Years	Combi
Glow-worm Ultracom2 cxi 30kW Gas Combi Boiler	89.3%	30kW	2 Years	Combi
Glow-worm Ultrapower 100 SXI 24kW Gas Combi Boiler	89.2%	24kW	2 Years	Combi
Glow-worm Xtramax HE 28kW Gas Combi Boiler	89.2%	28kW	3 Years	Combi

Glow-worm System Boilers

Boiler	Efficiency	Output	Warranty	Boiler Type
Glow-worm Easicom 25s Gas System Boiler	94%	25kW	3 years	System
Glow-worm Easicom3 25s Gas System Boiler	89.7%	25kW	4 years	System
Glow-worm Energy 12kW Gas System Boiler	89.3%	12kW	7 Years	System
Glow-worm Energy 15kW Gas System Boiler	89.3%	15kW	7 Years	System
Glow-worm Energy 18kW Gas System Boiler	89.3%	18kW	7 years	System
Glow-worm Energy 25kW Gas System Boiler	89.3%	25kW	7 years	System
Glow-worm Energy 30kW Gas System Boiler	89.3%	30kW	7 years	System
Glow-worm Ultimate2 25kW Gas System Boiler	89.3%	25kW	5 Years	System
Glow-worm Ultimate3 25kW Gas System Boiler	89.7%	25kW	5 Years	System

Glow-worm Regular Boilers

Boiler	Efficiency	Output	Warranty	Boiler Type
Glow-worm Easicom3 25kW Gas Regular Boiler	89.6%	25kW	5 Years	Regular
Glow-worm Energy 12kW Gas Regular Boiler	89.3%	12kW	7 years	Regular
Glow-worm Energy 15kW Gas Regular Boiler	89.3%	15kW	7 years	Regular
Glow-worm Energy 18kW Gas RegularBoiler	89.3%	18kW	7 years	Regular
Glow-worm Energy 25kW Gas Regular Boiler	89.2%	25kW	7 years	Regular
Glow-worm Flexicom hx 24kW Gas Regular Boiler	88.4%	24kW,	5 Years	Regular
Glow-worm Ultimate2 Regular 25kW Gas Regular Boiler	89.3%	25kW	5 Years	Regular
Glow-worm Ultimate3 25kW Gas Regular Boiler	89.6%	25kW	5 Years	Regular
Glow-worm Ultracom 24 hxi Gas Regular Boiler	88.4%	30kW	5 years	Regular

Glow-worm Boiler Error Codes

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

Glow-worm Energy Boiler Range Error Codes

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

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