Glow Worm Boiler Fault Code

Glow Worm boilers vary by simple identification of problems with the help of Glow Worm boiler fault codes. Below are 2 tables, thanks to which you can not only determine the cause of the problem, but in some cases you could fix the problem yourself. The table has fault codes, description of problem, possible cause and suitable solution. These tables will become an indispensable manual for the owners of boilers of this brand. They will help with the accuracy to determine the problem and decide whether to contact the service center or call the repairman or you can fix a problem yourself.

Glow Worm SXI Range 157235 Boiler Fault Codes

CODEDESCRIPTIONPOSSIBLE CAUSE
F1Ignition fault (lockout) Boiler failed to lightNo gas
Insufficient gas
Incorrect gas valve adjustment Electrode Ignition lead defect Electronic igniter defective Check air inlet duct Check connections to igniter unit
F4 (error solution F4)Ignition fault (lockout) Went out when litAs F1 possible cause
F5Overheat faultOverheat stat operated
Maximum temperature exceeded
Check thermistor connections
Air in system with thermistor at maximum setting
Faulty overheat stat connection
Check that pump is wired into appliance and not from programmer.
This would cause no pump overrun
F6Central heating flow thermistor faultThermistor cable defective/broken, thermistor faulty Check that thermistor attached correctly to pipe
F9 (error solution F9)Water pressure sensor faultFaulty sensor connection - check wiring
F10Central heating return thermistor faultThermistor cable defective/broken, thermistor faulty
Check that thermistor attached correctly to pipe
F11Main board connection faultCheck wiring between mainboard and user interface
F12User interface connection fault
F13Main PCB connection faultCheck connections and wires
F14Central heating flow temperature is greater than 95CSystem fault Possible pump failure
Check Thermistor on flow
F16Flame detection fault (flame presence for more than 5 seconds after burner stop)Gas valve defective
F17Power supply is less than 170VCheck electrical supply / polarity
F18User interface faultFaulty User Interface
F19Central heating thermistor unpluggedCheck Thermistor connection
F20Software incompatibilityIncorrect user interface or Main PCB
F21Lack of water fault (pressure is less than 0.5bar)System leak or faulty pressure sensor
F22 (error solution F22)Upper water pressure (is greater than 2.7bar)Filling device open
F24Central heating return temperature is greater than 90°CSystem fault Possible pump failure
Check Thermistor on return
F25 (error solution F25)Maximum temperature rise slopePossible pump failure Air in system
F26Maximum delta temperatureCheck Thermistor on return System - too restrictive

Glow Worm Betacom2 INSTN SERV 157121 Boiler Fault Code

Fault codesDescriptionCauseSolution
F00Flow heating temperature sensor faultSensor open circuit• Check the sensor’s connections.
F01Return heating temperature sensor faultReturn heating temperature sensor disconnected• Check the wiring harness.
F10Flow heating temperature sensor faultSensor short-circuit• Check the sensor.
F11Return heating temperature sensor faultReturn heating temperature sensor shorted.
F20Overheating faultOverheating safety device activated (97°C)• Check the operation of the pump.
• Check the wiring harness.
• Check that the flow and return heating isolation valves are open.
F22 (error solution F22)Water pressure of the installation (<0.3 bar)Return water valve closed Pump disconnected Leak in the installation• Fill the installation.
• Purge the installation.
• Check the pump connections.
• Check the flow and return heating sensor connections.
• Check that there are no leaks.
F23Maximum temperature difference reached between return and flow heatingWater circulation fault• Check the flow and return heating sensor connection.
• Check the pump speed.
F24Water circulation faultMalfunction of the pump (excessively rapid temperature increase)• Check that the flow and return heating isolation valves are open.
F26Fault in gas valve motor.Disconnected or defective cables• Check the gas valve connections.
• Check the operation of the gas valve.
• Check the operation of the condensate pump (option).
F27Flame detection fault.Abnormal flame detection• Check the flame detection electrode.
• Check the main board.
• Check the igniter unit.
F28Ignition faultNo return gas / Insufficient gas flow Gas valve incorrectly adjusted Defective firing electrode and flame control / Defective igniter unit• Check the return gas circuit (gas valve open).
• Check the observe the flame picture and check the C0 2 setting.
• Check the igniter unit connections.
F29Loss of flame during operation• Check the state of the electrode (corrosion).
F32Incorrect air pressureIncorrect fan speed.• Check the entire flue system.
• Check the fan’s electrical connections.
F49EBUS voltage faultFault in EBUS line• Check that the eBus controls are fitted and wired correctly.
Short circuit in EBUS connector
F61Fault in the main boardGas valve command fault• Check the main boards connections.
F62Gas valve closure fault• Check the main board.
F63Fault in the main board memory• Check the appliance DSN number is correct.
F64Rapid fluctuation of return or flow heating sensor.• Reset the appliance.
F65Excessive main board temperature
F67Flame signal fault in the main board
F68Fluctuation of flame signalNo return gas / Insufficient gas flow Gas valve incorrectly adjusted Defective firing electrode and flame control / Defective igniter unit• Check the return gas circuit (gas valve open).
• Check the observe the flame picture and check the C0 2 setting.
• Check the igniter unit connections.
• Check the state of the electrode (corrosion).
F70User interface incompatible with the main boardIncorrect product code• Check that the appliance DSN code on the screen matches the product code of the nameplate (in the event of a fault and the appliance DSN does not appear, consult menu.d.93 reserved for the code).
• Check the boards reference.
F71Flow heating temperature sensor faultFlow heating temperature sensor unclipped or defective (no temperature variation)• Check the sensor connections.
• Make sure that the sensor is clipped to the tube.
F72Permanent temperature difference between flow and return heating sensorsMismatch between the flow and return heating temperatures (permanent difference)• Check temperature sensors connections.
• Replace faulty sensors.
F73Heating circuit pressure sensor faultThe sensor is shorted or disconnected.• Check the sensor’s connections.
F74Heating circuit pressure sensor faultFault in pressure sensor• Check the sensor.
F76Thermal fuse faultThermal fuse disconnected Defective thermal fuse• Check the fuses connections.
• Replace the heat exchanger.
F 77Fault in gas valve motor.Defective gas valve.• Check the gas valve connections.
Defective condensate pump (option)• Check the operation of the gas valve.
• Check the operation of the condensate pump (option).
F83No water in the installation : the temperature does not increase when the burner is litReturn water valve closed Pump disconnected Leak in the installation• Fill the installation.
• Purge the installation.
• Check the pump connections.
• Check the flow and return heating sensor connections.
• Check that there are no leaks.
F84Permanent temperature difference between flow and return heating sensorsInverted or disconnected flow and return heating temperature sensors Defective temperature sensors• Check temperature sensors connections.
• Replace faulty sensors.
F85Flow and return heating sensors faultFlow and return heating temperature sensor connected to same tube• Check temperature sensors connections.
F86Underfloor heating contact faultFloor heating contact open Sensor disconnected or defective• Check the sensor connections.
• Check that the sensor is connected to the main board and the shunt is removed.
ErrUser interface faultDefective user interface• Check connection from user interface PCB to main PCB.
• Replace user interface.