Today, most modern Gas Boilers are equipped to tell you they are experiencing a problem. They do so by flashing fault codes or error codes, and you can see these codes on Boiler's display. If you want to know why your Boiler is not working, the first step is to check if any fault code or error code is displayed. Your entire heating system works in synergy for your house to stay warm. The Fault codes can instruct you where the fault in your heating system lies; that is, the problem could be with water pressure, the pump, power going to the Boiler, and so on. If it is pressure issues, which is the most common, you can top up pressure yourself, but if the problem is technical, you may need to call an expert plumber in Dublin for a diagnosis. That's where Stillorgan Gas, Plumbing, and Electrical can help you with your Gas Boiler Breakdowns and repairs.
If your Boiler is showing a fault code, here is a quick guide that will help you understand what's wrong with your Boiler and if you need to call a plumber or a heating engineer.
1. Ideal Boiler Fault Codes
Did you know: Stillorgan Gas, Plumbing and Electrical are the biggest Ideal Boiler Installer and Repair Company in Dublin. If your Ideal Boiler is not working, simply Call us
Ideal Boiler F Fault codes
FD – No Water Flow
This is a problem with your boiler's installation. You could try repressurising your boiler to resolve this issue, but if it doesn't work, we recommend contacting your installer to assess and repair your heating system.
F1 – Low Water Pressure
The Ideal boiler F1 problem is usually self-solvable by increasing your boiler's water pressure to 1.5 using the built-in filling loop. If you continue to have problems, you should call a Gas Safe registered engineer.
F2 – Flame Loss
Ideal boiler flame loss can be corrected by first checking your other gas appliances and then attempting to reset your boiler. This type of defect is more common in extremely old boilers that are operating at low efficiency, thus it may be more cost-effective to simply purchase a new boiler.
F3 – Fan Fault
This error will require the assistance of a certified engineer.
F4 – Thermistor Fault
It is best to call a Gas Safe registered engineer to fix this problem.
F5 – Return Thermistor Fault
It is best to call a Gas Safe registered engineer to fix this problem.
F6 – Outside Sensor Fault
The fault may be due to the installation of the weather compensator. If this is not the case, you should contact a qualified engineer to fix it.
F7 – Low Mains Voltage
If your voltage falls below 190 vacs, you may need to contact your installer, but since an electrician might be needed to fix this electrical problem.
F9 – Printed Circuit Board (PCB) Fault
Investing in a new boiler will be recommended as the cost of repairing these could be very high
Ideal Boiler L Fault Codes
L1 – Lack of Water Flow
To fix this issue, you should reset your boiler. If these steps do not work, then you should contact a qualified engineer. Overheating is usually a problem with older and less efficient boilers, so investing in a new heating system might be a good idea.
L2 – Ignition Lockout
You may need to reset your Ideal boiler. If there is a rumble from the system, your condensate pipe might be blocked or your flue might be blocked. This type of fault requires the services of an engineer.
L3 – No flow thermistor fault
This is a complicated fault that requires a call out from a qualified engineer.
L9/H9/HA/LA – Overheating
Please check your system's pressure level, and bleed your radiators to see if this helps. If it does not, contact a Gas Safe registered engineer. The overheating could be caused by a problem with the boiler's pump or dry fire stat.
LF – Boiler fails to ignite
Make sure all other gas appliances in your house are working. If they are, then you can reset your boiler. If your boiler is making an unusual rumbling sound, it could be caused by a blockage in the condensate pipe. A qualified engineer can help you resolve this problem.
L5 – Boiler Return Pipe Problem
This can be resolved by turning off the boiler's power and turning it back on again. If the problem persists, seek the assistance of a qualified engineer.
L6 – Flame Detection Fault
To resolve this issue, reset your boiler. If it still does not operate, and your system is under warranty, contact your manufacturer.
Ideal Boiler C Fault Codes
C2 – Boiler Chip Card Fault
Try to reset your boiler
C0 – Central Heating Signal Problem
Ask a certified engineer to check the thermostat and circulation in the radiator
Other Ideal Boiler Faults:
No Display
If you see this message, it means the boiler display is blank. Make sure the mains supply is on and that no trips have been made in the consumer unit.
Noisy Operation
Problems like excessive boiling often occur with central heating. Clicking or humming can indicate problems such as high pressure or loose parts. To resolve this issue, try re-compressing the boiler or inspecting the system for loose components. If one of these measures does not solve the problem, seek help from the repair team.
Fault Code 0
Ideal oiler status 0 means that the oiler is in standby mode waiting for hot water or central heating needs.
If you see any fault code flashing on your Ideal boiler it is better to call an engineer. The diagnosis will then tell you if it is better to get it repaired or to get it replaced. If you want to check if your Boiler is under warranty, we will help you with it, Call us
If you want to know more about Ideal Boilers, click here
2.Baxi Gas Boiler Error Codes:
The most common Baxi Gas Boiler error codes are explained below. To know more click the link here. The source: Baxi Error codes
1. BAXI 200 COMBI / BAXI 400 COMBI error codes
H.01 - .00
Temporary Fault - Temporary loss of communication between the gas valve and boiler board. Fault in air/gas unit.
Loose connection to the gas valve.
H.01 - .05
Temporary Fault - Maximum difference between the flow and return temperature exceeded. Non-existent or insufficient circulation. Sensor error.
H.01 - .08
Temporary Fault - Flow temperature increasing too fast in heating mode. Non-existent or insufficient circulation.Sensor error.
H.01 - .14
Temporary Fault - Maximum flow temperature value exceeded. Non-existent or insufficient circulation. Non-existent or insufficient circulation.
H.01 - .18
Temporary Fault - No circulation of water. Non-existent or insufficient circulation. Sensor error.
H.01 - .21
Temporary Fault - Flow temperature increasing too fast in DHW mode. Non-existent or insufficient circulation. Sensor error.
H.02 - .02
Temporary Fault - No input of parameters C1/C2. PCB not configured.
H.02 - .03
Temporary Fault- Incorrect configuration settings C1/C2
H.02 - .04
Temporary Fault - Parameter error. Incorrect parameters.
H.02 - .06
Temporary Fault - System water pressure. Water leak on the boiler. Water leak on the system.
H.03 -.00
Temporary Fault - Communication error with NTC flue sensor. Sensor not, or badly connected. Bad connection. Sensor fault.
H.03 -.01
Temporary Fault - Communication error with the HMI PCB. HMI is not connected.
H.03 -.02
Temporary Fault - No flame during operation. No ionization current.
E.00 - .04
Permanent Fault - Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault
E.00 - .05
Permanent Fault - Return temperature sensor open-circuit. Sensor not or badly connected. Bad connection. Sensor fault.
E.01 - .02
Permanent Fault - Temperature measured by return sensor greater than flow sensor. Bad connection. Sensor fault. Sensor not or badly connected.
E.01 - .04
Permanent Fault - Loss of flame detected 5 times in 24 hours (With burner on). No ionization current.
E.01 - .11
Permanent Fault Requiring Reset - Incorrect fan speed. External draught over the boiler. Defective gas/air unit
E.01 - .12
Permanent Fault Requiring Reset - Temperature measured by return sensor greater than flow temperature.
E.01 - .17
Permanent Fault Requiring Reset - No circulation. Sensor not or badly connected. Sensor fault.
E.01 - .20
Permanent Fault - Maximum flue gas temperature value reached (>140 Deg C). No circulation. Sensor fault.
E.02 - .00
Permanent Fault - Boiler reset in progress. The reset button has been pressed.
E.02 - .07
No or low system water pressure. Low system pressure (less than 0.5bar) boiler will not function.
E.02 - .16
Permanent Fault - Onboard CSU time-out. Check PCB for damage.
E.02 - .17
Permanent Fault - Permanent loss of communication between the gas valve and boiler PCB. Fault in air/gas unit. Loose connection to the gas valve.
E.02 - .47
Permanent Fault - Connection to external device unsuccessful. Check wiring to the external device
E.02 - .48
Permanent Fault - Configuration to external device unsuccessful. Check to pair to external.
E.04 - .00
Permanent Fault - Gas valve fault. Gas valve not detected.
E.04 - .01
Permanent Fault - Flow temperature sensor short-circuited. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 - .02
Permanent Fault - Flow temperature sensor open-circuited. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 - .03
Permanent Fault - Critical flow temperature reached. Non-existent or insufficient circulation.
E.04 - .04
Permanent Fault - Flue temperature sensor short-circuited. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 - .05
Permanent Fault - Flue temperature sensor open-circuited. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 - .06
Permanent Fault - Critical flue gas temperature value reached. No circulation. Sensor fault.
E.04 - .08
Permanent Fault - Maximum safe temperature value reached. (Safety thermostat open-circuited). No circulation. Sensor not or badly connected. Bad connection. Sensor fault.
E.04 - .10
Light failure (could be a gas supply issue).
E.04 - .12
Permanent Fault - False flame signal. Short-term fluctuation of the mains. Ionization current presents even though there is no flame. The burner remains very hot (CO2 too high). Defective gas/air unit.
E.04 - .13
Permanent Fault - Fan rotor blocked. Fan seized. Wiring to fan damaged.
E.04 - .17
Permanent Fault - Problem with the gas valve. Defective gas/air unit.
2. BAXI PLATINUM+ 40KW error codes
E20 error code
Central heating NTC fault
E28 error code
Flue NTC fault, air pressure switch fault, blocked flue, blocked condensate or wiring fault.
E50 error code
Hot water NTC fault
E110 error code
E110 safety thermostat operated
E119 error code
Water pressure switch not operated
E125 error code
Circulation fault (primary circuit)
E130 error code
Flue NTC operated
E133 error code
Interruption of gas supply or flame failure
E160 error code
Fan or fan wiring Fault
E193 error code
Pre-circulation fault
3. BAXI 600 COMBI / BAXI 800 COMBI error code
E09 error code
Gas valve connection cable.
E10 error code
External probe fault.
E12 error code
Differential water flow switch fault (still open).
E13 error code
Differential water flow switch fault (still closed).
E15 error code
Gas valve command fault.
E20 error code
Central heating NTC fault.
E28 error code
Flue NTC fault.
E40 error code
Central heating returns NTC fault.
E50 error code
DHW NTC sensor fault (tank boiler) (s.c.) OR DHW NTC sensor fault (tank boiler) (o.c.).
E83/E84/E85/E86/E87 error code
No communication.
E109 error code
Pre-circulation fault.
E110 error code
i) Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit). OR ii) Boiler max temperature exceeded for overtemperature (probable pump jammed or air in the circuit). OR iii) Safety thermostat sensor tripped.
E118 error code
Primary system water pressure too low (< 0.5 bar).
E125 error code
Circulation fault (primary).
E128 error code
Frequent flame failure (12 times).
E129 error code
Safety error for frequent loss of flame with max correction during the ignition during Calibration Function.
E130 error code
Flue thermostat sensor tripped (lockout).
E133 error code
Light failure (could be a gas supply issue).
E134 error code
Elapsed time gas valve open without gas (short request in a short period)
E135 error code
Interruption of gas supply (internal error).
E154 error code
Flow/return sensor temperature test.
E160 error code
Fan or fan wiring fault.
E163 error code
Domestic Hot Water NTC sensor fault (s.c.) OR Domestic Hot Water NTC sensor fault (o.c.).
E270 error code
Circulation fault (dry fire).
E317 error code
Wrong power supply electrical frequency (Hz).
E321 error code
Hot water NTC fault.
E384 error code
False flame.
E385 error code
Under voltage.
E430 error code
Water pressure temporary test
E430 + Flame 'crossed' error code
The water pressure test failed.
4. BAXI 600 HEAT / MAIN ECO COMPACT HEAT
1 flash green error
Maximum flow temperature exceeded, Flow temperature rise rate too high, Excessive difference between, flow and return temperature
2 flashes green error
BL terminals on User Interaction, Controller are open circuit
3 flashes green error
No flame detected during operation
4 flashes green error
Bad connection or wiring fault, Internal communication fault
5 flashes green error
Parameter error or faulty PU, Configuration error or PCB fault
6 flashes green error
possible fault Internal fault in combustion control unit
1 flash red error
Bad connection to flow or return temperature sensor
2 flashes red error
Over-temperature thermostat on heat exchanger activated, No water flow through heat exchanger, PCB over-temperature condition, Flue fault resulting in, Recirculation or activation of airpressure switch (if fitted)
3 flashes red error
No ignition, No flame detected following ignition, False flame signal detected
4 flashes red error
Fan calibration error, Fan failure
5 flashes red error
Bad connection to PU, Parameter error or faulty PU
6 flashes red error
possible fault Bad connection or wiring fault, Parameter error
5. BAXI 600 SYSTEM / BAXI 800 SYSTEM / BAXI 600 LPG error code
E09 error code
Gas valve connection cable
E15 error code
Gas valve fault
E20 error code
Central heating NTC fault
E28 error code
Flue NTC fault
E40 error code
Central heating return NTC fault
E83 error code
Communication error
E109 error code
Pre-circulation fault
E110 error code
Safety thermostat operated
E118 error code
Primary system water pressure too low
E125 error code
Circulation fault (primary)
E128 error code
Flame failure
E130 error code
Flue NTC operated
E133 error code
Interruption of gas supply or flame failure
E135 error code
Interruption of gas supply (internal error)
E135 error code
Interruption of gas supply (internal error)
E154 error code
Flow/ return sensor temperature test
E160 error code
Fan or fan wiring fault
E270 error code
Circulation fault (Dry fire)
E321 error code
Hot water NTC fault
E384 error code
False flame
If you want to know more about Baxi Boilers, click here
3. Worcester Gas Boiler Fault Codes
Lock Error
Boiler display blinks with warning triangle and error code. At the same time, the (static) cause code will also be displayed. Manual intervention is required (press the reset button on the front panel of the boiler) after the fault has been eliminated.
Blocking error
the boiler will stop working without any error data being displayed. The cause code, in the info menu, can be accessed by pressing the back key/button. The condition will clear automatically when the relevant fault disappears, e.g. wait for an area to cool. In some cases, the blocking error has a certain amount of time before switching to the blocking condition.
Fault error
Alphanumeric code indicating the error group.
Cause error
Three-digit number. While a blocking error (or normal operating state) occurs, it is not displayed, but is accessible in the info menu via the back key/button. During a lock failure, the cause code will flash on the display.
Maintenance codes
H11
Hot water can still be delivered but with less control due to a faulty hot water outlet sensor.
H13
A time, ranging from 1 to 72 months, was set in the Service interval function, and that time has now expired. This feature can be enabled or disabled via the 2.5F menu (1 to 72); a 0 disables the function.
- Worcester Bosch fault codes: locking errors
Locking errors -9A: HCM (Heat control module)Cause code: 362Possible cause Incorrect HCM fitted
Locking errors -9U: HCM (Heat control module)Cause code: 233Possible cause The code plug causing problems (faulty or not connected)
Locking errors - B7: Internal errorCause code: 257Possible cause: Replace control board
Locking errors - C6: Fan problemCause code: 215/216Possible cause: Running too fast/Running too slow
Locking errors C7: Fan problemCause code: 214Possible cause: Fan not running
Locking errors- C7: No airflow after a defined period of time Cause code: 217Possible cause: Fan not running or airflow blocked
Locking errors- D1: Return sensor errorCause code: 240/241Possible cause: Sensor wet or damaged /Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition)
Locking errors- D1: Return temperature too highCause code: 286Possible cause: Boiler overheat
Locking errors- E2: Flow sensor short/open circuitCause code: 222/223Possible cause: Flow sensor shorted or damaged
Locking errors- E5: Flow temperature too highCause code: 218Possible cause: Primary flow sensor overheated
Locking errors- E5: Primary flow sensor has exceeded 110°CCause code: 332Possible cause: Primary flow sensor overheated
Locking errors- E9: Safety sensor temperature too highCause code: 219Possible cause: The main heat exchanger has overheated. Maximum temperature 105°C
Locking errors- E9: Safety sensor short/open circuitCause code: 220/221Possible cause: Maximum temperature sensor on the main heat exchanger has failed/ not recognized
Locking errors- E9: Max temperature thermostat activatedCause code: 224Possible cause: Flue gas thermostat overheat
Locking errors- EA: No flame detected after ignitionCause code: 227Possible cause: Failure of four ignition attempts. The boiler waits 30 seconds before another attempt is made
Locking errors- EA: Loss of flame signal during operationCause code: 229Possible cause: This could be caused by:– Moisture in the sump, due to a blocked sump/condensate trap– A strong wind into the flue
Locking errors- EA: Gas valve errorCause code: 234Possible cause: Gas valve coil disconnected
Locking errors- EA: Ignition timing errorCause code: 261Possible cause: Flame not established during the first 4 seconds ignition period
Locking errors- EA: Too many short burner starts without confirmationCause code: 338Possible cause: There is an error where the pump is not detecting water – check pressure gauge and repressurise to 1 bar
- Worcester Bosch fault codes: blocking errors
Locking errors- A1: Pump stuck or running in airCause code: 281Possible cause: Little or no water in the system – check pressure gauge and repressurise to 1 bar
Locking errors- C1: Airflow stopped during operation Cause code: 264Possible cause: Fan has stopped
Locking errors- EA: No ionisation detected after ignition Cause code: 227Possible cause: No flame is detected. The boiler will block during 4 attempts before going to Locking fault
Locking errors- EF: Central heating, boil detect – Large delta T despite minimum burnerCause code: 349Possible cause: The boiler is operating at minimum burner load and there is a greater than 18°C Flow & Return temperature difference
Locking errors- No code: Safety or flow temperature rises too fast Cause code: 212Possible cause: Air lock or reduced water content – check pressure gauge and repressurise to 1 bar
Locking errors- No code: Temperature difference between supply and return exceeding limit Cause code: 213Possible cause: Air lock or reduced water content – check pressure gauge and repressurise to 1 bar
Locking errors- No code: No temperature rise after burner startsCause code: 260Possible cause: Sensor disconnected or no water content – check pressure gauge and repressurise to 1 bar
If you want to know more about Worcester Boiler, click here
4. Vokera Gas Boiler Fault Codes
_St fault code
Autostop
_CL fault code
Call for service
A01 fault code
Ignition failure flame not sensed – internal fault
A01 fault code
Limit thermostat fault
A03 fault code
Fan fault
A04 fault code
Insufficient system water pressure
A06 fault code
Domestic how water (DHW) thermistor fault
A07 fault code
Primary flow thermistor fault – temperature of the water is too high
A08 fault code
Return thermistor fault – water temperature too high
A09 fault code
Flue thermistor or flue thermistor counter fault
A11 fault code
False flame
A77 fault code
Low-temperature thermostat fault
ADJ fault code
Calibration
ACO fault code
Service operation
N/A fault code
Flame on
P fault code
Preheating function active
P Blinking fault code
Preheating function running
Hours
Stand-by
-Off
01 fault code
Failure to ignite
02 fault code
Overheat
03 fault code
Problem with fan/flue
04 fault code
Insufficient water pressure
05 fault code
Reset as described for code 01
06 fault code
Hot water thermistor open circuit
07 fault code
Primary thermistor open circuit
Vokera Mynute Boiler Error Codes
AL10, AL20, AL21, AL26, AL28, AL34 fault code
Try resetting the boiler, if the fault reoccurs you need to contact a heating engineer
AL40 fault code
Check the system’s pressure and refill if necessary. Reset the boiler, if the fault reoccurs then you need to contact a heating engineer
AL41 fault code
Check system pressure – refill if necessary. If the fault reoccurs, contact a heating engineer
AL52, AL55, AL60, AL71,AL73, AL74, AL79 fault code
Contact a heating engineer
AL74, AL79 fault code
Reset the boiler. If the fault reoccurs, contact a heating engineer
Vokera Evolve Combi Boiler Error Codes | Vokera Evolve System Boiler Error Codes
E10 fault code
Flame lockout
E011 fault code
Extraneous flame
E020 fault code
Limit thermostat
E030 fault code
Fan fault
E040 fault code
Water transducer – check the system water pressure
E041 fault code
Water transducer – check the system water pressure
E042 fault code
Water transducer fault
E060 fault code
Domestic hot water probe fault
4070 fault code
Fault flow sensor over temperature – flow sensor flow/return line probe differential alarm
E077 fault code
Main zone water thermostat
E080 fault code
Error with return line probe – over-temperature outlet or differential alarm
E090 fault code
Flue gases over-temperature probe
E091 fault code
Clean primary heat exchanger
E021, E022, E023, E024, E067. E088, E097 fault code
Iono alarm
E085, E094, E095 fault code
Combustion fault/high CO
E058 fault code
Main voltage error
E065 fault code
Current modulation alarm
E086 fault code
Obstruction fumes alarm
If you want to know more about Vokera Boilers, click here
Glow worm Boiler Faults
Glow-worm Betacom Boiler
Fault: Red LED On
Lockout – low water pressure
Fault: Red LED flashing
Overheat
Fault: Yellow LED flashing
Turn the domestic hot water (DHW) control knob into the temperature range and turn the central heating (CH) temperature control knob into power (reset position)
Fault: Green LED off
No power to the boiler
Glow-worm Betacom4 / Ultracom3 cxi / sxi / 35Boiler
F00 / F10 / F71 Fault Code
Flow heating temperature sensor fault
F01 / F11 Fault Code
Return heating temperature sensor fault
F20 Fault Code
Overheating
F9 / F22 Fault Code
Low water pressure
F26 / F77 Fault Code
Fault in gas valve
F27 / F16 Fault Code
Flame detection fault
F28 / F1 / F4 Fault Code
Ignition fault
F29 Fault Code
Loss of flame during operation
F32 Fault Code
Incorrect air pressure
F49 Fault Code
EBUS voltage fault
F61 / F62 / F63 / F64 / F65 / F67 Fault Code
Fault in the main board
F68 Fault Code
Fluctuation of flame signal
F70 Fault Code
User interface incompatible with the main board
F72 / F84 Fault Code
Permanent temperature difference between flow and return heating sensors
F73 / F74 Fault Code
Heating circuit pressure sensor fault
F76 /F83 Fault Code
Thermal fuse fault
F85 Fault Code
Flow and Return heating sensor fault
All Glowworm Boilers
ERR / F12 / F18 Fault Code
User interface fault
F2 Fault Code
Fan/APS
F5 Fault Code
Overheat Fault
F6 Fault Code
Central heating flow thermistor
F7 Fault Code
Domestic hot water thermistor
F8 Fault Code
Tank thermistor fault
F10 Fault Code
Central return flow thermistor
F11 Fault Code
Main board connection fault
F25 / F23 Fault Code
Generic Error
Potterton Boiler Fault Codes
Potterton Promax Combi, System Error Codes
Error Code | Possible reason |
E10 | Outdoor sensor error |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E50 | Domestic hot water sensor fault |
E110 | Boiler overheat tripped |
E119 | System pressure too low |
E125 | Boiler overheat tripped |
E130 | Flue thermostat sensor tripped (lockout) |
E131 | Flue overheat lockout |
E133 | Ignition fault |
E151 | Printed circuit board (PCB) error |
E152 | PCB error |
E160 | Fan fault |
E152 | PCB error |
E164 | PCB error |
E167 | Printed circuit board (PCB) fault |
E168 | Printed circuit board (PCB) lockout |
E193 | Circulation |
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
Error | Possible reason |
E09 | Gas valve wiring fault |
E10 | Outdoor sensor error |
E15 | Gas valve connection fault |
E20 | Central heating thermistor sensor fault |
E28 | Flue thermistor fault |
E40 | Central heating return thermistor fault |
E50 | Domestic hot water sensor fault |
E53 | Flue obstruction |
E55 | Calibration required |
E78 | Water pressure sensor fault |
E83 / 84 / 85 / 86 / 87 | No communication between room controller and boiler |
E92 | Combustion test alarm during auto-setting |
E109 | Poor circulation |
E110 | Boiler overheat tripped |
E117 | System pressure too high (>2.9 bar) |
E118 | System pressure too low |
E125 | Loss of flame during operation |
E129 | Loss of flame during calibration |
E130 | Flue thermostat sensor tripped (lockout) |
E133 | Ignition fault |
E135 | Internal error |
E154 | Primary flow fault |
E160 | Fan fault |
E270 | Dry fire |
E317 | Wrong power supply (HZ) |
E321 | Hot water thermistor fault |
