If cancelled within 14 days, alternative payment of full outstanding balance must be made. To help fix your Vaillant boiler problem, have a look below at each fault code: Short circuit on the eBUS, eBUS overload or two power supplies with different polarities on the eBUS. Alternatively, click here to get a new boiler quote. The good news is that, more often than not, our boiler can tell us whats wrong with it and it doesnt always require the expertise of a boiler engineer to help get it working again. Check the resistor, repeat the gas family check and enter the correct gas family. Whether it's inspiration for your new kitchen, how to bleed a radiator - or even a few things to keep your little one's busy. This could mean, wrong gas restrictor, recirculation, wrong gas family, internal pressure measuring point in venturi is blocked (do not use lubricant on O-ring in the venturi), or the gas family check has prematurely terminated. L1 Flow Temperature Overheat or No Water Flow. Cable to water pressure sensor has short-circuited at 5V/24 V or internal fault in water pressure sensor. This usually appears in extreme cold weather when the outside pipe is frozen. As accredited installers of the three of the top tried and trusted boiler brands in the UK, Worcester Bosch, Vaillant and Ideal, we have provided a list of the most common fault codes below by brand. This is very common with these boilers and usually means the fault is most likely to do with the boilers sensor not being aware that the pump has started running. Gas valve defective, cable harness to gas valve defective. The combustion quality is outside the permitted range. Water pressure sensor and/or pump defective, air in heating installation, too low water pressure in boiler; check adjustable bypass, connect external expansion vessel to return. The boiler waits 30 seconds before another attempt is made, EA An established flame has been extinguished. "Very happy with the whole process from start to finish. Rear Office Try to get the sensor to a normal range to begin operation. There is an error where the pump is not detecting water check pressure gauge and repressurise to 1 bar. Experiencing problems with your Vaillant boiler? Flow Temperature Overheat or No Water Flow. If your Vaillant boiler is displaying a code beginning with the letter F, then it is signalling that the appliance is experiencing a fault. When a boiler stops working it generally shows a fault code, or error code. diff. baxi All Rights Reserved. E3 Sensor Open implausible: Flow and return temperature sensors returning implausible values. Flow and return temperature sensors have been inverted Flow and return temperature sensors have not been correctly in-stalled, Fault: NTCs fitted incorrectly: The flow and/or return temperature sensors have been installed on the same pipe/incorrect pipe. : Electronics overheating due to external influences, electronics defective, Fault: Electronics/flame: Implausible flame signal, electronics defective, Fault: Flame signal unstable: Air in gas, gas flow pressure too low, incorrect air ratio, condensate duct blocked, ionisation flow interruption (cable, electrode), flue gas recirculation, condensate duct, Fault: Invalid Device Specific Number: If spare parts fitted: Display and PCB replaced at same time and DSN not reset, incorrect or missing output range coding resistance, Fault: Flow sensor: Flow temperature sensor signalling constant value: Flow temperature sensor incorrectly positioned at supply pipe Flow temperature sensor defective, Fault: Flow/return sensor: Flow/return NTC temperature difference too great flow and/or returntemperature sensor defective, Fault: Water press. Craig left everything clean and tidy and was helpul in explaining the controls. Follow your manufacturers manual to do thisF75 (Vaillant) sensor change. 9U Problem with the code plug (faulty or not connected), C7 Fan not running / Fan not running or airflow blocked, D1 Sensor wet or damaged (the boiler will block for 300 seconds before this condition), E9 The main heat exchanger has overheated. Andy is a passionate creative writer, film buff, and smart home enthusiast. Electronics overheating due to external influences, or electronics defective, F.67Electronics/flame fault. The Sensor Status screen shows the status of all sensors. The coding resistor on the PCB does not match the entered gas family. Its always a pain when your boiler stops working, of course, but before you call a qualified boiler engineer to come out and fix it, its a good idea to attempt at least some basic diagnosis of the problem. Ableforce Services Ltd is an Appointed Representative of Koze Group Ltd who are authorised and regulated by the Financial Conduct Authority. Unit 4, Bristol Vale Trading Estate, Company Number 09477125. UK link box is connected, but the hot water NTC is not bridged. 0117 964 0078, GAS SAFE is the trading name of Gas Safe Bristol Limited. F.93Gas group fault. F.92 Coding resistor fault- The coding resistor on the PCB does not match the entered gas family. When the burner starts, the temperature change registered at flow and/or return temperature sensor is non-existent or too small, or not enough water in the boiler, or flow and/or return temperature sensor not in correct position, F.84Flow/return temperature sensor difference is implausible, F.85Flow and return temperature sensors incorrectly fitted, F.92Coding resistor fault. Combustion regulation fault: The combustion regulation has detected a fault Gas flow pressure too low Liquid gas coding resistance used when operating with natural gas If the fault occurs again after being cleared: Gas valve defective Mass flow sensor/Venturi defective, wet or blocked (if the fault occurs again after being cleared): Do not wet the sensor, do not use any lubricants on the O-ring on the Venturi. Table 28 Temperature sensor resistance values - 12K. Gas Safe Number: 1818. Understanding Types of Central Heating Systems, How to Bleed your Radiators on a Combi Boiler System, D1Sensor wet or damaged or disconnected (the boiler will block for 300 seconds before showing D1), E2Flow sensor shorted, damaged or disconnected, E9The main heat exchanger has overheated maximum temperature is 105C, E9Maximum temperature sensor on the main heat exchanger failed or has not been recognised, EAFour ignition attempts have failed. The boiler will block during 4 attempts before going to a locking fault, EFThe boiler is operating at minimum burner load and there is a greater than 18C Flow & Return temperature difference, 260Sensor disconnected or no water content check the pressure gauge and repressurise the boiler to 1 bar, No CodeIf no code is shown but the boiler is still not operating, this could mean an airlock or reduced water content check the pressure gauge and repressurise the boiler to 1 bar, L1Flow Temperature Overheat or No Water Flow, F.49eBUS fault A short circuit on the eBUS, eBUS overload or two power supplies with different polarities on the eBUS, F.52Mass flow sensor connection fault. Combustion quality outside the permitted range: Wrong gas restrictor, recirculation, wrong gas family, internal pressure measuring point in venturi blocked (do not use lubricant on O-ring in venturi.). Both will be useful resources for helping you to work out what the code is as well as provide helpful tips on how to fix it. Maximum temperature 105C, Maximum temperature sensor on the main heat exchanger has failed, Maximum temperature sensor on the main heat exchanger has not been recognised, Failure of four ignition attempts. This could be caused by either moisture in the sump, due to a blocked sump/condensate trap, or a strong wind into the flue, EAFlame was not established during the first 4 seconds of the ignition period. Visit our, Experiencing problems with your Vaillant boiler? In the following Temperature to Ohm chart, compare the Ohm value to the temperature of the sensor to verify its condition. 18 Sensor Open, Registered in England & Wales. 543 1621 71 A1 Little or no water in the system check pressure gauge and repressurise to 1 bar. The boiler will block during 4 attempts before going to Locking fault, EF The boiler is operating at minimum burner load and there is a greater than 18C Flow & Return temperature difference, No Code Air lock or reduced water content check pressure gauge and repressurise to 1 bar, 260 Sensor disconnected or no water content check pressure gauge and repressurise to 1 bar, F.49 eBUS fault Short circuit on the eBUS, eBUS overload or two power supplies with different polarities on the eBUS, F.52 Mass flow sensor connection fault Mass flow sensor not connected/disconnected, plug not connected or incorrectly connected, F.53 Mass flow sensor fault Mass flow sensor faulty, filter below venturi filter cap wet or blocked, gas flow pressure too low, F.54 Gas pressure fault (in combination with F.28/F.29)- No or too little gas supply pressure, gas valve closed, F.56 Fault: Mass flow sensor regulation Gas valve defective, cable harness to gas valve defective, F.57 Fault during comfort safety mode Ignition electrode highly corroded, F.61 Fault: Gas valve regulation Short circuit/short to earth in cable harness for the gas valveGas valve defective (coils shorted to earth). U9, A1 or No code (Worcester), F75 (Vaillant), or F1 (Ideal) low water pressure. sensor temperature gas o2 probe oxygen screw If it is a cold startup, and the appliance is a DC series appliance, go to setup and ensure that it is looking for an HC series appliance rather than the ODHW leaving temperature sensor. Your email address will not be published. Shorted or open supply temperature sensor, Shorted or mis-wired supply sensor wiring. Spare part case: Display and PCB replaced at same time and DSN not set, wrong or missing output range coding resistor. Fault code: Bath to heat There is no communication with the PCB. Required fields are marked *. and An implausible flame signal, or electronics defective, F.68Unstable flame signal fault. Below we look at the fault codes for some of the most popular types of boiler in the UK to give you an idea as to what your system is trying to tell you. You may have to wait for the condensate to defrost. Flow and/or return temperature sensors have been fitted to the same pipe/wrong pipe. UK Manufacturer Ideal has been producing boilers for over 100 years and offers good value and dependable units. The boiler waits 30 seconds before another attempt is made, An established flame has been extinguished.This could be caused by:moisture in the sump, due to a blocked sump/condensate trap.a strong wind into the flue, Flame not established during the first 4 seconds ignition period. No or too little gas supply pressure, gas valve closed, F.56Fault: Mass flow sensor regulation. Velocity Boiler Works is the sole marketer of Crown Boiler cast iron boiler products. Problem with the code plug (faulty or not connected), Fan not running / Fan not running or airflow blocked, Sensor wet or damaged (the boiler will block for 300 seconds before this condition), Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition), The main heat exchanger has overheated. Air in the gas, or gas flow pressure too low, or wrong air ratio, or condensate route blocked, or wrong gas restrictor, or ionisation flow interruption (cables, electrodes), or flue gas recirculation, or condensate route problem, F.71Flow NTC fault. Bristol, BS3 5RJ Gas family check prematurely terminated. If you are in any doubt and the boiler has stopped working, then dont delay, call Gregor Heating on 0117 935 2400 today! Flow and return temperature sensors have not been correctly fitted, F.85 Fault: Flow and return temperature sensors incorrectly fitted- Flow and/or return temperature sensors have been fitted to the same pipe/wrong pipe. Combustion quality outside the permitted range: Wrong gas restrictor, recirculation, wrong gas family, internal pressure measuring point in venturi blocked (do not use lubricant on O-ring in venturi.). You will be able to find the cause code by pressing the spanner / return button. Our FRN is 964534. How battery backup can add value to your solar PV system, Gregor Heating, Electrical & Renewable Energy. Delayed shutdown of gas valve or delayed extinguishing of flame signal, or gas valve leaking, or electronics defective, F.63EEPROM error. Coding resistance fault: The coding resistance on the PCB does not match the entered gas group: Check the resistance, repeat the gas family check and enter the correct gas group. By continuing to use this website you are giving consent to cookies being used. Good luck, if in doubt and the boiler has stopped working, then dont delay and call Gregor Heating on 0117 935 2400 today! To make things easy to diagnose, boilers often display an Error Code when they are not working. As a pioneer of the Combi Boiler and still delivering high-quality products, many homes have a Vaillant Boiler installed to serve their heating and hot water requirements. Credit is provided by Novuna Personal Finance, a division of Mitsubishi HC Capital UK PLC authorised and regulated by Financial Conduct Authority. The mass flow sensor is not connected/disconnected, plug not connected or incorrectly connected, F.53Mass flow sensor fault. If you want to find out more about any of our services, click the button to get in touch. baxi e25 boiler caldaie installazione impianti Supply or return NTC has short-circuited, electronics defective, F.65Electronic temperature fault. Living is here to keep your life moving! All sensors in the boiler are a 12K sensor @77F or 25C curve. EAThere is an error because the pump is not detecting water in the system usually this means low pressure, check the pressure gauge and repressurise the boiler to 1 bar. oxygen measuring boiler robust system sensor accessories The boiler will block during 4 attempts before going to Locking fault, The boiler is operating at minimum burner load and there is a greater than 18C Flow & Return temperature difference, Air lock or reduced water content check pressure gauge and repressurise to 1 bar, Sensor disconnected or no water content check pressure gauge and repressurise to 1 bar. Good luck! Bristol 3633 I Street, Philadelphia, PA 19134 Poor combustion quality: Combustion regulation has detected poor combustion quality Incorrect gas restrictor has been installed for the gas family (anothergas family is present) Recirculation Mass flow sensor/Venturi defective (wet, blocked): Do not wet thesensor, do not use any lubricants on the O-ring on the Venturi. Especially because those bad days most commonly occur when the boiler is turned back on after a nice long break from not having to work hard to heat your home. As the leading manufacturer of gas boilers in the UK, there are a significant number of these units installed in thousands of homes. E4 Sensor Short, Fault code: Implausible flame signal, electronics defective. The mass flow sensor is faulty, filter below venturi filter cap wet or blocked, gas flow pressure too low, F.54Gas pressure fault (in combination with F.28/F.29). Flow temperature sensor signalling constant value: Flow/return NTC temperature difference too great flow and/or return temperature sensor defective. Living is your place to learn and explore. Air in gas, gas flow pressure too low, wrong air ratio, condensate route blocked, wrong gas restrictor, ionisation flow interruption (cables, electrodes), flue gas recirculation, condensate route. No response from flue non-return flap or condensate pump is defective, F.78Interruption to DHW outlet sensor at external controller. too high: Break in plug connection for optional flue gas safety temperature limiter (STB), break in cable harness, Fault: Fuel valve not working: Gas valve stepper motor not connected, multiple plug on the PCB not plugged in correctly, interruption in cable harness, gas valve stepper motor defective, electronics defective, Safety switch-off: Flame simulation: Moisture on the electronics, electronics (flame monitor) defective, gas solenoid valve leaking, Start-up failure: Ignit. Our expert repairs team are on hand to diagnose the issue and get things working again in no time. The coding resistor on the PCB does not match the entered gas family. So read on to find out which one might be relevant for you. If the sensor is out of range the boiler will not operate. Whilst these tend to be some of the most reliable boilers available, its still good to know what the issue is if something went wrong. However, different models have different fault codes and here at Gregor Heating, we do see three common codes crop up which are:EA (Worcester) or F27 (Vaillant) blocked condensate pipe. This might show you that the issue is something simple that you can fix yourself. Gas valve leaking Electronics defective, F.63 EEPROM error Electronics defective, F.64 Electronics/NTC fault Supply or return NTC short circuited, electronics defective, F.65 Electronic temperature fault Electronics overheating due to external influences, electronics defective, F.67 Electronics/flame fault Implausible flame signal, electronics defective, F.68 Unstable flame signal fault Air in gas, gas flow pressure too low, wrong air ratio, condensate route blocked, wrong gas restrictor, ionisation flow interruption (cables, electrodes), flue gas recirculation, condensate route, F.70 Invalid device specific number (DSN)- Spare part case: Display and PCB replaced at same time and DSN not set, wrong or missing output range coding resistor, F.71 Flow NTC fault Flow temperature sensor signalling constant value:Flow temperature sensor incorrectly positioned at supply pipe. "Alexa, who is Andy Floyd?" actoSTOR electronics status: LED on: Communication OKLED flashing: Communication not OK LED off: No power supply, Communication fault: Communication fault between display and PCB in the electronics box. Mass flow sensor faulty, filter below venturi filter cap wet or blocked, gas flow pressure too low. Privacy Policy Agreement * These units all tend to be reliable, but just in case, we have detailed the descriptions of common fault codes for each manufacturer below.Despite this useful information, we would still strongly advise that any further diagnostics or repair is performed by a fully qualified Gas Safe registered company such as Ableforce Services. 2022 Gregor Heating, Electrical & Renewable Energy is the trading name of Steve Gregor Plumbing and Heating Limited. EA No flame is detected. What to do if water is leaking through your ceiling, Electric car charging at home: everything you need to know, Short circuit/short to earth in cable harness for the gas valve, Gas valve defective (coils shorted to earth), Flow temperature sensor incorrectly positioned at supply pipe, When the burner starts, the temperature change registered at flow and/or return temperature sensor is non existent or too small, Flow and/or return temperature sensor not in correct position at pipe, Flow and return temperature sensors return implausible values, Flow and return temperature sensors have been inverted, Flow and return temperature sensors have not been correctly fitted.