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Updated: May 21, 2024

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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Keston Boiler Error Codes

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 CodeThe Problem
E01Ignition failure – the boiler has attempted to light 5 times and not succeeded – check the gas supply is on
E02False flame – possibly a problem with the power supply
E03Boiler 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
E05Fan failure – boiler cannot detect fan rotation – check fan operation and both connectors onto fan
E07Flue 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.
E08Flame circuit error – possible control box fault
E09Valve drive error – possible gas valve or control box fault
E10Control box errors – possible faulty control box
E11The 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 E22Control box errors – possible faulty control box
E23Water filling error – check water pressure sensor
E24Water pressure lost 4 times in 24 hours – possible leak, check system and boiler
E25Control box errors – possible faulty control box
E26Flame drop out – check for obstruction of the flue and/or air terminals, blockage/freezing of the drain pipe or a low gas supply (LPG).
E30Flow sensor short circuit – check connections to flow sensor
E31Flow sensor open circuit – check connections to flow sensor are in place
E32DHW sensor short circuit – check connections to domestic hot water (DHW) sensor
E33Domestic hot water (DHW) sensor short circuit – check connections to DHW sensor are in place
E34Mains supply voltage < 180V – may be a problem with your power supply
E35Mains supply frequency incorrect – may be a problem with the power supply
E37Water pressure error – increase the system water pressure
E38Reset key fault – replace fascia PCB
E40Water pressure too high
E41Communication error between fascia and control box – check cables
E43Return sensor short circuit – check connections to return sensor
E44Return sensor open circuit – check connections to return sensor are in place
E45Flue sensor short circuit – check connections to flue sensor
E46Communication error between fascia and control box – check cables
E99Flue sensor short circuit – check connections to flue sensor are in place

S30 System Gas Boiler Error Codes

Fault CodeThe Problem
0The boiler is in standby mode awaiting either a central heating call or hot water demand
CThe boiler has a call for central heating / hot water but the appliance has reached the desired temperature set on the boiler
C and Burner LightThe boiler is operating for central heating / hot water
F and Burner LightThe boiler is operating in frost mode
F0Boiler Chip Card (BCC) not fitted
F6Outside sensor failure
F7Low mains voltage
F9Printed circuit board (PCB) Fault
L55 boiler resets in 15 minutes
L6False flame lockout
C0Boiler Chip Card (BCC) activation fault
C2Boiler Chip Card (BCC) fault
F1Low water pressure
L1Flow temperature overheat
F2Flame loss
L2Flame loss
F3Fan fault
F4Control / No flow thermistor
F5Return thermistor

C40 C55 Combi Gas Boiler

Fault CodeThe Problem
EnnFault causing a boiler shutdown
E00Flame detected when not expected – check boiler earth and probe condition
E02No ignition after restart – check gas supply, gas valve operation and ignitor electrode spark generation
E03Gas valve faulty or not connected
E04Power has been reset whilst boiler was in lockout
E11Internal electronics error – rest or replace control box
E18Flow overheat – check water circulation
E19Maximum return temperature exceeded – check circulation
E25Flow temperature increased too quickly – check water circulation
E30Difference between flow and return temperatures too high – check circulation.
E31Flow thermistor short circuit – check/replace connections/thermistor
E32Return thermistor short circuit – check/replace connections/thermistor
E36Flow thermistor open circuit – check/replace connections/thermistor
E37Return thermistor open circuit – check/replace connections/thermistor
E44Low 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.