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Guarantee registration
Your Glow-worm guarantee covers you for the repair of any defects related to the manufacture of your Glow-worm appliance. The repair has to be completed by one of our Vaillant Service Engineers* and will cover both parts and labour Your guarantee does not cover defects which are unrelated to the manufacture of the product or a result of misuse. We'll send you the full terms and conditions of the guarantee along with your guarantee confirmation. Alternatively, you can read them here. Terms & con...
Renewable Service
System Design Good designs are incredibly important if you are going to get the highest level of efficiency and pay back from a renewables system. Our expert design service is completely tailored to suit your individual site requirements. Using the latest state of the art CAD technology we provide high quality designs supported by full indemnity cover. Our expert systems technologies team will also provide planning and on site support for the most unique and challenging of renewables projects. ...
Training Enquiry Form
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Please complete the request below with the Training course you are interested in and a member of your team will be in touch.
Boiler Service Fault Finding Codes
Fault finding codes for the Compact e range
Fault finding codes for the Compact e range Symtoms Possible Faults No DHW Check dhw microswitch No C/H Check dhw microswitch if dhw demand led is lit No C/H but boiler is firing Check divertor motor and cartridge Boiler locks out within 10 seconds Check pump proving switch, air pressure switch and overheat stat Poor burner pressure Check burner pressure/ignition adjustment pots on PCB Back to overview
Book your boiler repair with Glow-worm
We’ll repair your boiler for a fixed price, unless uneconomical to do so. Book it now Contact an installer close to your home, or request a callback. Select now Our boiler repair service hotline is available 7 days a week. Get in touch For urgent help Gas Safe registered Well-trained Certified to repair and service Glow-worm boilers and controls Find an Installer Address where the boiler is Boiler model Boiler serial number (found underneath your boiler) Call us easicom boiler Her...
Fault Finding Codes
Fault finding codes for the Xtramax HE range
Fault finding codes for the Xtramax HE range Codes Description F1 Ignition fault F2 Fan F3 Fan F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F7 Domestic hot water thermistor F8 Tank thermistor F9 Water pressure sensor fault (please contact GW technical department for further information) F10 Central return flow thermistor F11 Main board connection fault F12 User interface connection fault F13 PCB memory or sensing fault F14 Gas valve control defective F16 Flame detectio...
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Thank you for registering your interest. We will be in touch soon to give you more information on how to get onto the Glow-worm Mystery Trip!
Centre Of Excellence Training Locations:
Maxim 1, 2 Parklands Way Eurocentral Lanarkshire ML1 4WR Office Hours: 9am – 5pm Unit D1 Lowfields Business Park Elland, West Yorkshire HX5 9DG Office Hours: 9am – 5pm Nottingham Road Belper Derbyshire DE56 1JT Office Hours: 9am – 5pm Unit 1390, Aztec West Almondsbury Bristol BS32 4RX Tel: 0345 601 8885 Office Hours: 9am – 5pm Ground Floor, 7400 building Cambridge Research Park Waterbeach, Cambridge CB25 9TL Office Hours: 9am – 5pm 6 Alexander Grove Kings Hill West Mallin Maidstone, Kent ME19 4...
Boiler Servicing Fault Finding Codes
Fault finding codes for the CI Plus range
Fault finding codes for the CI Plus range Codes Description F1 Ignition fault F2 Fan/APS F3 Air fault F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F7 Domestic hot water thermistor F8 Tank thermistor (N/A For this appliance) F9 Water pressure sensor fault (please contact GW technical department for further information F10 Central return flow thermistor F11 Main board connection fault F12 Connection fault between main pcb and display pcb F13 Main pcb connection fault F14...
Fault Finding Codes
Fault finding codes for the sxi range
Fault finding codes for the sxi range Codes Description F1 Ignition fault F2 Fan F3 Fan unable to reach ignition speed F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F7 Domestic hot water thermistor F8 Tank thermistor (N/A For this appliance) F9 Water pressure sensor fault (please contact GW technical department for further information) F10 Central return flow thermistor F11 Main board connection fault F12 Connection fault between main pcb and display pcb F13 Main pcb co...
Log in to your Glow-worm account
Right now we're developing lots of features to help you and your business. Want to find out more and be involved? Send us a message to register your interest.
Fault Finding Codes
Fault finding codes for the Ultracom cx range
Fault finding codes for the Ultracom cx range Codes Description F1 Ignition fault F3 Fan unable to reach ignition speed F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F9 Water pressure sensor fault, blocked flow filter or pump fault F10 Central return flow thermistor F11 Main board connection fault F13 PCB memory or sensing fault F14 Gas valve control defective F15 E-bus voltage failure F22 Low water pressure or ignition temperature rise too slow F25 Circulation fault F4...
How different technologies work
Our boilers are built right here in the UK and include combination, system and regular models that are all durable and highly efficient. Find out more Control your home with the touch of a button from your smartphone or tablet. Use our intelligent home technology to enhance your home comforts. Find out more Customise your Glow-worm boiler by choosing a control which suits you. Keep it nice and simple with an on/off thermostat or an intelligent smartphone control. Find out more
Privacy Policy
Vaillant Group UK Limited (“Vaillant”) is committed to safeguarding your privacy. This Privacy Statement describes why and how we collect, use, and who we may disclose your personal data (information) with, during your visit to this web site. We encourage you to read this Privacy Statement before submitting information. By using this web site, you acknowledge that you understand and agree to the terms of this Privacy Statement. Should you have any questions regarding the use of your data in acc...
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Fault Finding Codes
Fault finding codes for the cxi range
Fault finding codes for the cxi range Codes Description F1 Ignition fault F2 Fan F3 Fan unable to reach ignition speed F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F7 Domestic hot water thermistor F8 Tank thermistor (N/A For this appliance) F9 Water pressure sensor fault (please contact GW technical department for further information F10 Central return flow thermistor F11 Main board connection fault F12 Connection fault between main pcb and display pcb F13 Main pcb con...
VAILLANT GROUP UK LIMITED – GLOW-WORM BRIGHTON INSTALLER EVENT CREDITS
VAILLANT GROUP UK LIMITED – GLOW-WORM BRIGHTON INSTALLER EVENT CREDITS PROMOTION TERMS & CONDITIONS 1. QUALIFICATION 1.1 Subject to clauses 1.2, 1.3, 1.4 and 1.5 below, Vaillant Group UK Limited trading as Glow-worm (Glow-worm) provides this Glow-worm Brighton installer event credits promotion (Promotion), which is open to applicants, over the age of 18 years, who are resident in mainland United Kingdom. For the avoidance of doubt, mainland United Kingdom excludes, without limitation, the Chann...
Get Ready For ErP With Ease With Glow-worm
Your guide to the new regulations and how they affect you
First, let’s take a brief look at the changes The European Union agreed on a package of energy and climate protection measures known as the Energy-related Products (ErP) Regulation and the Energy Labelling Directive (ELD). As a result of this agreement the EU Commission has set ambitious new targets for energy and climate protection. The targets are to achieve: 20% increase in the use of renewable energies by 2020 20% cut in greenhouse gas emissions by 2020 20% cut in energy consumption by 2020...
Conditions for Use
Glow-worm is a trading name of the Vaillant Group, which includes Vaillant GmbH and Vaillant Group UK Limited. Vaillant will adequately endeavor to ensure that this website will contain exact and valid information. We however do not assume liability for or guarantee the up-to datedness, correctness and completeness of the information made available or the suitability of this information for a specific purpose. All information is made available “as it is”. Vaillant does not assume the responsibi...
PHEX Chelsea 2018
The Glow-worm team is proud to be exhibiting at PHEX Chelsea 2018 on 14th and 15th of November at Stamford Bridge Stadium in Chelsea, London. Glow-worm will be on stand 82 in the main hall as well as exhibiting in the HPS suite. The talk of the show will be the great guarantee offers that now range from five to 10 years for boiler installations registered on the Glow-worm loyalty programme, Club Energy. Alice Woolley, Marketing Director for the Glow-worm brand said, “PHEX Chelsea is always a gr...
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Heritage Of Glow-worm
The Glow-worm Boiler and Fireplace Co Ltd starts producing boilers at the Derwent Foundry in Derbyshire, utilising the strong currents of the River Derwent to drive the manufacturing plant. Glow-worm produces ‘balanced flue’ - the room sealed, gas heating and hot water boiler. Creating balanced flued appliances gives increased flexibility with boiler siting and improved safety for the homeowner, as the appliance is completely room sealed. Glow-worm grows further with the introduction of domesti...
Fault Finding Codes
Fault finding codes for the SI range
Fault finding codes for the SI range Codes Description F1 Ignition fault F2 Fan/APS F4 Ignition fault F5 Overheat Fault F6 Central heating flow thermistor F7 Domestic hot water thermistor F8 Tank thermistor (N/A For this appliance) F9 Water pressure sensor fault (please contact GW technical department for further information) F10 Central return flow thermistor F11 Main board connection fault F12 Connection fault between main pcb and display pcb F13 Main pcb connection fault F14 Central heating ...
Fault Finding Codes
Fault finding codes for the Ultracom₂ cxi range
Fault finding codes for the Ultracom₂ cxi range Codes Description F00 Flow heating temperature sensor fault F01 Return heating temperature sensor fault F10 Flow heating temperature sensor fault F11 Return heating temperature sensor fault F20 Overheating fault F22 Low water pressure F23 Water circulation fault F24 Water circulation fault F26 Fault in gas valve F27 Flame detection fault F28 Ignition fault F29 Loss of flame during operation F32 Incorrect air pressure F49 EBUS voltage fault F61 Fau...
Boiler Plus FAQs
Q. What if I don’t comply with Boiler Plus? A. You could be prosecuted by Building Control if you as an installer fail to comply with Boiler plus. Q. What if homeowners don’t want “complicated” controls? A. Boiler Plus compliant controls don’t have to be expensive and complex, a simple room thermostat or outdoor sensor can be an easy and effective solution. If a homeowner knowingly allows non-compliant work, they also face prosecution and possibly a fine of up to £5000. Q. Will there be a requi...
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