Table of Contents
Keston Boiler Error Codes
Who are Keston?
ce of Keston boilers, the ideal choice for compact spaces and small properties in London. With a rich history dating back to 1928, Keston has been committed to providing reliable domestic and commercial heating solutions. In 2006, Keston joined forces with Ideal and production shifted to Ideal’s state-of-the-art factory in Hull.
Designed for efficiency and convenience, Keston boilers feature a unique twin flue system, making installations effortless in any location. Whether vertically or horizontally, the flue can be extended up to an impressive 27 meters from the boiler, offering unmatched flexibility. This ensures hassle-free installation, allowing you to position your new boiler in the most practical and suitable spot within your property.
Experience the reliability and versatility of Keston boilers, the perfect heating solution for flats and small spaces. Trust in Keston’s legacy of excellence and enjoy efficient heating tailored to your specific needs.
Contact us today to learn more about Keston boilers and find the perfect heating solution for your London property.
What do Keston offer?
Invest in a Keston boiler and enjoy the benefits of a 7-year warranty along with a wide range of compatible controls. From the Keston 22mm/28mm system filter to the RF Electrical Programmable Room Thermostat and the Mechanical Timer, these controls ensure maximum performance and efficiency from your boiler.
While repairing your existing boiler may seem like a viable option, it’s worth considering that certain issues can be expensive to fix. In such cases, opting for a new boiler can prove to be more cost-effective in the long run. Not only will a new boiler address the existing problems, but it will also offer enhanced efficiency, helping you save both money and energy over time.
Upgrade to a new Keston boiler and make a wise investment for the future. Experience improved performance, reduced energy consumption, and enjoy the peace of mind that comes with a 7-year warranty. Contact us today to explore your options and discover the perfect boiler solution for your needs.
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What to do if I have a problem with my Keston Boiler?
If you think that there is a problem with your Keston boiler, make sure to check the information below. We have prepared a list of the error and fault codes that you may see displayed by your boiler. These codes can help you identify the exact problem with your boiler. This will make it easier for you tell the Gas Safe Engineer what the exact issue is.
If you suspect an issue with your Keston boiler, refer to the information below. We have compiled a list of error and fault codes that may appear on your boiler’s display. These codes can help you pinpoint the specific problem with your boiler, making it easier to communicate the exact issue to the Gas Safe Engineer.
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C36 Combi Gas Boiler Error Codes
Fault Code | The Problem |
E01 | Ignition failure – the boiler has attempted to light 5 times and not succeeded – check the gas supply is on |
E02 | False flame – possibly a problem with the power supply |
E03 | Boiler overheat – check that any valves to the heating circuit have not been shut down, no air in the system and that the water pressure is correct |
E05 | Fan failure – boiler cannot detect fan rotation – check fan operation and both connectors onto fan |
E07 | Flue overheat – check combustion and flue temperature vs. return temperature – the flue temperature should be no more than 10C above return temperature. Possible heat exchanger fault. |
E08 | Flame circuit error – possible control box fault |
E09 | Valve drive error – possible gas valve or control box fault |
E10 | Control box errors – possible faulty control box |
E11 | The automatic test for calibration of flow and return sensors has failed – check both flow and return sensors are located on the correct pipes and are producing the correct readings |
E12 to E22 | Control box errors – possible faulty control box |
E23 | Water filling error – check water pressure sensor |
E24 | Water pressure lost 4 times in 24 hours – possible leak, check system and boiler |
E25 | Control box errors – possible faulty control box |
E26 | Flame drop out – check for obstruction of the flue and/or air terminals, blockage/freezing of the drain pipe or a low gas supply (LPG). |
E30 | Flow sensor short circuit – check connections to flow sensor |
E31 | Flow sensor open circuit – check connections to flow sensor are in place |
E32 | DHW sensor short circuit – check connections to domestic hot water (DHW) sensor |
E33 | Domestic hot water (DHW) sensor short circuit – check connections to DHW sensor are in place |
E34 | Mains supply voltage < 180V – may be a problem with your power supply |
E35 | Mains supply frequency incorrect – may be a problem with the power supply |
E37 | Water pressure error – increase the system water pressure |
E38 | Reset key fault – replace fascia PCB |
E40 | Water pressure too high |
E41 | Communication error between fascia and control box – check cables |
E43 | Return sensor short circuit – check connections to return sensor |
E44 | Return sensor open circuit – check connections to return sensor are in place |
E45 | Flue sensor short circuit – check connections to flue sensor |
E46 | Communication error between fascia and control box – check cables |
E99 | Flue sensor short circuit – check connections to flue sensor are in place |
S30 System Gas Boiler Error Codes
Fault Code | The Problem |
0 | The boiler is in standby mode awaiting either a central heating call or hot water demand |
C | The boiler has a call for central heating / hot water but the appliance has reached the desired temperature set on the boiler |
C and Burner Light | The boiler is operating for central heating / hot water |
F and Burner Light | The boiler is operating in frost mode |
F0 | Boiler Chip Card (BCC) not fitted |
F6 | Outside sensor failure |
F7 | Low mains voltage |
F9 | Printed circuit board (PCB) Fault |
L5 | 5 boiler resets in 15 minutes |
L6 | False flame lockout |
C0 | Boiler Chip Card (BCC) activation fault |
C2 | Boiler Chip Card (BCC) fault |
F1 | Low water pressure |
L1 | Flow temperature overheat |
F2 | Flame loss |
L2 | Flame loss |
F3 | Fan fault |
F4 | Control / No flow thermistor |
F5 | Return thermistor |
C40 C55 Combi Gas Boiler
Fault Code | The Problem |
Enn | Fault causing a boiler shutdown |
E00 | Flame detected when not expected – check boiler earth and probe condition |
E02 | No ignition after restart – check gas supply, gas valve operation and ignitor electrode spark generation |
E03 | Gas valve faulty or not connected |
E04 | Power has been reset whilst boiler was in lockout |
E11 | Internal electronics error – rest or replace control box |
E18 | Flow overheat – check water circulation |
E19 | Maximum return temperature exceeded – check circulation |
E25 | Flow temperature increased too quickly – check water circulation |
E30 | Difference between flow and return temperatures too high – check circulation. |
E31 | Flow thermistor short circuit – check/replace connections/thermistor |
E32 | Return thermistor short circuit – check/replace connections/thermistor |
E36 | Flow thermistor open circuit – check/replace connections/thermistor |
E37 | Return thermistor open circuit – check/replace connections/thermistor |
E44 | Low water pressure |
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FAQs
How long do Keston Boilers last?
With the right amount of care and maintenance, a Keston boiler can heat your home for 10-15 years.
Who makes Keston boilers?
Keston’s was originally established in 1928 to provide domestic and commercial heating installations and servicing. In 2006, Keston was purchased by Ideal Heating before moving production to Ideal’s Hull manufacturing site in 2013.
What type of boiler is a Keston C40?
The Keston C40 and C55 use a variable speed combustion blower to deliver a premix of gas and air to a downward firing burner in a high efficiency, single pass heat exchanger. The flue system is room sealed and fan powered.
How do I increase the pressure on my Keston boiler?
The most common Keston boiler fault is low water pressure. The amount of water in your boiler and the water pressure are directly connected. So, if you add water, you be able to also increase the pressure.
Where are Keston Boilers made?
An early pioneer of condensing boilers, Keston was purchased by Ideal Boilers in 2006. Boiler production was moved to Ideal’s Hull manufacturing site in 2013 and all Keston boilers since have been designed, developed and manufactured in the UK.