This blog has the complete list of Heatline boiler fault codes, including instructions and boiler installation manuals for every model of Heatline boiler.
Heatline is a boiler brand that has been going for around 50 years. Heatline is a trademark of the Vaillant group. Heatline is considered a budget brand in the boiler industry, focusing on condensing combi boilers at an affordable price.
The latest Heatline models are the Capriz 2 boilers, available in a 24kW and 28kW option. The Heatline Capriz2 is an ErP A-rated boiler, with a SEDBUK 2009 efficiency rating of 89.3%.
It’s not as easy to find reviews on the Heatline as you might think given they have been going for 50 years. With only 2 reviews on Trustpilot and 24 on reviewcentre.com to see, giving an average rating of 4.3 out of 5. Which sounds pretty decent. However, they do seem to divide opinion, with some people having a good experience and others complaining that if anything goes wrong then parts are expensive and aftercare is poor.
Generally, heating engineers don’t have a favorable opinion on Heatline boilers, some claiming they ‘wouldn’t give one to an enemy’.
If you’re reading this article then it’s likely your Heatline boiler has broken down and you probably aren’t feeling much love for it right now. Even the premium brand boilers get issues from time to time, so let’s see if we can identify the issue for you and help get it fixed.
We’ve compiled a list of Heatline Boiler error codes so you can identify what the issue is with your boiler and hopefully fix it. You should always contact a Gas Safe Engineer for any issue relating to your boiler or heating system. The purpose of this guide is to help you diagnose the issue so you can get an idea of the cost to fix your Heatline boiler or replace it if fixing it isn’t cost-effective.
Generally, Heatline boilers only come with a short guarantee/warranty length, so there’s a good chance you’re out of warranty. If not, get in touch with Heatline and see if you can get them out to take a look (and hopefully fix) your boiler.
If your boiler is out of warranty, rather than put money into fixing it might be worth getting a quote on a new boiler, give WarmZilla a try. Prices start from £1489 including installation, wireless controls, system cleanse, system filter, and a guarantee lasting between 5 & 10 years depending on which boiler model you select.
WarmZilla offers boiler finance starting from as little as £9.80 per month, with 0% interest over 2 years on selected boilers. Our lenders have a very high acceptance rate, even if you have a bad credit history.
Check out the table below to find your error code and see what the fault code on your Heatline boiler relates to:
Fault Codes | Description | Cause | Solution |
|---|---|---|---|
| F00 | Flow heating temperature sensor fault | Sensor open circuit | • Check the sensor’s connections |
| F01 | Return heating temperature sensor fault | Return heating temperature sensor disconnected | |
| F10 | Flow heating temperature sensor fault | Sensor short-circuit | |
| F11 | Return heating temperature sensor fault | Return heating temperature sensor shorted | |
| F20 | Overheating fault | Overheating 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 | 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 |
| F23 | Maximum temperature difference reached between return and flow heating | Water circulation fault | • Check the flow and return heating sensor connection. • Check the pump speed. |
| F24 | Water circulation fault | Malfunction of the pump (excessively rapid temperature increase) | • Check that the flow and return heating isolation valves are open |
| F26 | Fault 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) |
| F27 | Flame detection fault. | Abnormal flame detection | • Check the flame detection electrode. • Check the main board. • Check the igniter unit. |
| F28 | Ignition fault | No 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 fl ame picture and check the CO2 setting. • Check the igniter unit connections. • Check the state of the electrode (corrosion) |
| F29 | Loss of flame during operation | ||
| F32 | Incorrect air pressure | Incorrect fan speed. | • Check the entire flue system. • Check the fan’s electrical connections |
| F49 | EBUS voltage fault | Fault in EBUS line Short circuit in EBUS connector | • Check that the eBus controls are fitted and wired correctly |
| F61 | Fault in the main board | Gas valve command fault | • Check the main boards connections. • Check the main board. • Check the appliance DSN number is correct. • Reset the appliance. |
| F62 | Gas valve closure fault | ||
| F63 | Fault in the main board memory | ||
| F64 | Rapid fluctuation of return or flow heating sensor. | ||
| F65 | Excessive main board temperature | ||
| F67 | Flame signal fault in the main board | ||
| F68 | Fluctuation of flame signal | No 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 fl ame picture and check the CO2 setting. • Check the igniter unit connections. • Check the state of the electrode (corrosion). |
| F70 | User interface incompatible with the main board | Incorrect 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). • Check the board’s reference. |
| F71 | Flow heating temperature sensor fault | Flow heating temperature sensor unclipped or defective (no temperature variation) | • Check the sensor connections. • Make sure that the sensor is clipped to the tube |
| F72 | Permanent temperature difference between flow and return heating sensors | Mismatch between the flow and return heating temperatures (permanent difference) | • Check temperature sensors connections. • Replace faulty sensors. |
| F73 | Heating circuit pressure sensor fault | The sensor is shorted or disconnected | • Check the sensor’s connections • Check the sensor |
| F74 | Heating circuit pressure sensor fault | Fault in pressure sensor | |
| F76 | Thermal fuse fault | Thermal fuse disconnected Defective thermal fuse | • Check the fuse connections • Replace the heat exchanger |
| F77 | Fault in gas valve motor. | Defective gas valve. Defective condensate pump (option) | • Check the gas valve connections. • Check the operation of the gas valve. • Check the operation of the condensate pump (option). |
| F83 | No water in the installation: the temperature does not increase when the burner is lit | 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. |
| F84 | Permanent temperature difference between flow and return heating sensors | Inverted or disconnected flow and return heating temperature sensors Defective temperature sensors | • Check temperature sensors connections. • Replace faulty sensors |
| F85 | Flow and return heating sensors fault | Flow and return heating temperature sensor connected to same tube | • Check temperature sensors connections |
| F86 | Underfloor heating contact fault | Floor heating contact open Sensor disconnected or defective | • Check the sensor connections. • Check that the sensor is connected |
| Err | User interface fault | Defective user interface | • Check connection from user interface PCB to main PCB. • Replace user interface. |
If you’re experiencing heating issues with your Heatline boiler then the flowchart might be useful in identifying the issue and what steps to take next.
If you’re experiencing issues getting hot water from your Heatline boiler then the flowchart below might be able to help you identify the issue and what steps to take.
Below is a complete list of Heatline boiler manuals courtesy of our friends over at freeboilermanuals.com.
Heatline Capriz 25kW Boiler Manual
Heatline Capriz 28kW Boiler Manual
Heatline Capriz 25S Boiler Manual
Heatline Capriz 28S Boiler Manual
Heatline Capriz Plus 24kW Boiler Manual
Heatline Capriz Plus 28kW Boiler Manual
Heatline Capriz 2 24C Boiler Manual
Heatline Capriz 2 28C Boiler Manual
Heatline compact S20S Boiler Manual
Heatline compact S24S Boiler Manual
Heatline compact S30S Boiler Manual
Heatline Monza 24kW Boiler Manual
Heatline Monza 28kW Boiler Manual
Heatline Sargon 24kW Boiler Manual
Heatline Sargon 30kW Boiler Manual
Heatline Sargon 35kW Boiler Manual
Heatline Solaris 24PC Boiler Manual
Heatline Solaris 30PC Boiler Manual
Heatline Vizo 24kW Boiler Manual
Heatline Vizo 28kW Boiler Manual
Heatline Vizo plus 24kW Boiler Manual
If you have any questions about your error code then we’re always here to help or advise. Just get in touch with us using our live chat or by emailing ask@warmzilla.co.uk
Do heat pumps work in the UK winter?
In colder climates, air source may experience reduced efficiency as the outdoor temperature drops. Additional heating sources or supplementary heating may be required during extreme cold spells.
Why are heat pumps not popular in the UK?
Heat pumps have not been as popular in the UK for a few reasons. Firstly, homeowners still have limited awareness and understanding regarding the benefits of having one. The higher upfront installation costs than traditional heating systems, such as gas boilers, can deter some homeowners. Additionally, retrofitting older properties with heat pumps can present challenges, including the need for infrastructure upgrades and insulation improvements.
The widespread availability and familiarity of the gas grid in the UK have made gas boilers a more common choice. Furthermore, the limited availability of qualified installers for heat pumps can create barriers to adoption – it can be something of a postcode lottery. However, with increasing government initiatives, rising energy costs, and growing emphasis on sustainable heating solutions, the popularity of heat pumps is expected to rise in the future.
Do heat pumps use a lot of electricity to run?
Heat pumps are very energy efficient. In fact, they can often achieve a 300-400% efficiency rate, as the amount of heat energy produced is markedly higher than the energy consumed.
However, to be truly cost-effective, the cost of electricity needs to be lower than the current 3.2x the cost of gas. At this level, it means the technology isn’t nearly as cost-effective as it should be, so we’d hope this price gap would at least narrow over time.
