Professional Heating Services Ltd

Common Error Codes


COMMON ERROR CODES

Worcester Bosch Fault Codes

FAULT DESCRIPTIONPOSSIBLE CAUSE
Fault ErrorA fault code is an alpha numeric code that will offer you an indication to the error by telling you the fault group.
Locking Error If there is a locking error, there will be a flashing fault code as well as a warning triangle and a static cause code. Pressing the reset button will be required to eradicate the fault
Blocking Error If there is a blocking error, no data will be displayed but your boiler will stop operating. By pressing the return/spanner button, you will be able to find the cause code. If for example, the boiler is waiting for an action such as the cooling of an area, the error will automatically resolve once this is done
Cause Error A cause error code will be a three digit number, found when locating the block error
Maintenance Code A maintenance code (beginning with H) will tell you when there is a situation that will not stop the boiler operating, but will need the attention of an engineer
LOCKING FAULT CODEPOSSIBLE CAUSE
9A Boiler has been fitted with incorrect Heat Control Module (HTM)
9UThe code plug could be faulty or not properly connected
B7You need to replace the control board
C6The system is running too fast or too slow
C7 Fan is not running or the airflow could be blocked
D1Sensor could be wet, damaged or disconnected. The boiler will block for 300 seconds
D1Boiler is overheating
E2The Flow sensor has shorted, is damaged or disconnected
E5The primary flow sensor has overheated
E9The main heat exchanger has overheated as the main temperature is 150 degrees
E9Maximum temperature sensor on the main heat exchanger cannot be recognised or has failed
E9The flue gas thermostat has overheated
EAFailure after four ignition attempts. The boiler will wait 30 seconds before another attempt is made
EAA flame has been extinguished due to either moisture in the sump, a blocked sump or strong wind in the flue
EAGas valve coil has been disconnected
EAFlame has not extinguished within first 4 seconds of ignition
EAThere is an error as the pump is not detecting water. Check the pressure gauge and re-pressurise to 1 bar
BLOCKING FAULT CODEPOSSIBLE CAUSE
A1 Little or no water in the system- Check pressure gauge and re- pressurise to 1 bar
EA No flame is detected and so the boiler will block during 4 attempts before going to Locking fault
EF The boiler is operating at minimum burner load and there is higher flow temperature of 18 degrees
260 Sensor has been disconnected or there is no water content- check pressure gauge and repressurise to 1 bar
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Glow Worm Boilers

MODELCODEFAULT
BetacomRed LED onLockout – low water pressure (increase pressure to 1.5bar) and reset boiler
BetacomRed LED flashingOverheat – check both overheat stats
BetacomYellow LED flashingTurn 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
BetacomYellow LED onFlame present on the burner
BetacomGreen LED onBoiler ready for operation
BetacomGreen LED offNo 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/F22Low 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 F32Incorrect air pressure
Betacom / Ultracom2 cxi / sxi / 35 F49EBUS voltage fault
Betacom / Ultracom2 cxi / sxi / 35 F61 / F62 / F63 / F64 / F65 / F67 Fault in the main board
Betacom / Ultracom2 cxi / sxi / 35 F68Fluctuation of flame signal
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 F83Thermal fuse fault
Betacom / Ultracom2 cxi / sxi / 35 F85Flow and Return heating sensor fault
Betacom / Ultracom2 cxi / sxi / 35 F86Underfloor heating contact fault
All BoilersERR / 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 F2Fan/APS
All Boilers F5 Overheat Fault
All Boilers F6 Central heating flow thermistor
All Boilers F7Domestic hot water thermistor
All Boilers F8Tank thermistor fault
sxi / si / ci (plus) range / Xtramax HE F9Water pressure sensor fault (please contact GW technical department for further information)
All boilers F10Central return flow thermistor
All boilers F11Main board connection fault
Ci (plus) / cxi / hxi / si / sxi range F12Connection fault between main printed circtuit board (PCB) and display PCB
Ci (plus) / cxi / hxi / si / sxi range F13Main pcb connection fault
Ci (plus) / cxi / hxi / si / sxi range F14 Central heating flow temperature > 95 degrees
Ci (plus) / cxi / si / sxi range F15Gas valve stepper motor fault
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F17Power supply is less than 170v
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F19Central heating thermistor unplugged
Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F20Software 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 F3Air 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 F3Fan 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 F14Gas valve control defective
Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F15E-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)
Condensate pump error (optional) F9Earlier models only (please contact GW technical department for further information)
Ultracom2 35 Store F02 / F12 Hot water temperature sensor fault
Ultracom2 35 StoreF03 / F13 / F79 Storage tank temperature sensor fault
Ultracom2 35 StoreF81 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 F26Maximum 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

ATAG Boilers

FAULT CODEPOSSIBLE CAUSE
10Outside sensor error
20Flow sensor error
40Return sensor error
50DHW sensor error (iC-Range only)
61Bus communication error
78Water pressure out of range
105Venting program active when power turned on or interrupted (runs approx. 7 mins)
110Safety temperature exceeded .
111Maximun pressure exceeded
117Pressure too high (> 3 bar) or pump pressure increase too high (iC & iS Range only)
118Pressure too low (< 1 bar) or pump pressure increase too low) no pump detection) (iC & iS Range only)
119Link on X2 position 4 and 5 missing
129Fan error (fan does not start up)
133No flame after 5 ignition attempts
151Fan error (speed control is not achieved or is out of range) or control unit defective
154Flow temperature increases to fast, return > flow
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