Keston Boiler Error Codes / Fault Codes Re July 16, 2021

Keston Boiler Error Codes / Fault Codes

Warm-Home

Keston Boiler Fault Codes – The complete guide. 

Originally established in 1928, Keston Heating aimed to provide domestic and commercial heating installations and servicing. Ideal Heating purchased Keston Heating in 2006 before moving production to Ideal’s factory, based in Hull, in 2013.

Keston’s Trustpilot reviews don’t exactly fill you with joy, however, a lot of the customer reviews are regarding aftersales and customer service rather than the boilers themselves. If you delve deeper into the review, you find that those who have left a positive review refer to the performance and reliability of their Keston boiler.

Although Keston boilers have received an overall score of 3.3 stars out of 5 on Trustpilot, there are only 25 reviews. It is also important to remember that many of these reviews were written before Ideal boilers purchased the brand.

When you look at Ideal boilers Trustpilot reviews, Ideal has 4.7 stars out of 5 and over 8.6k reviews, which shows once they rebranded Keston boilers and customers began dealing with a different aftercare team, they’ve managed to convert unhappy customers to happy customers. Hopefully, this will make you feel a little more positive about being able to fix or resolve the issue with your Keston boiler. 

Here are some of the positive reviews left by Keston customers:

“I had my Keston boiler installed in April 2020. It was a good choice as I required a very long flue. I’ve had no problems at all so far. I think improvements have been made since previous reviews. I have a 7-year warranty but haven’t needed to use it so far.”

“I did do some research on Keston and discovered that when Ideal bought the brand they ditched the old Keston boilers and rebranded the Ideal Logic so both the C35 and Logic 35 are identical. Looks as if the bad reviews are for the old Keston boilers before Ideal bought them over and rebranded the Logic”. 

Keston boilers are typically used in compact spaces such as smaller flats/properties in locations such as London. This is because Keston boilers offer a twin flue system which makes every job easier. In order to give you maximum flue flexibility, you are able to run the flue vertically or horizontally from an elevation of 1.5 degrees and the flue can be extended up to 27 metres from the boiler. This allows for hassle-free and easy installation and means that your new boiler can be installed in the most practical and convenient space in your home. 

Keston boilers come with up to 7 years warranty and a range of compatible controls such as the Keston 22mm/28mm System Filter, the RF Electronic Programmable Room Thermostat, and a Mechanical Timer that ensure the best performance from your boiler. 

Now you’ve reached this part of the blog, you should feel more confident in Keston as a brand, however, if you do feel that it’s time to purchase a new boiler, then get a new boiler quote from WarmZilla.

Our online survey asks you a set of simple questions about your current boiler, and it will show you a list of boilers suitable for your heating needs. It only takes a few minutes. WarmZilla does not stock Keston boilers, however, there are plenty of other options to choose from when purchasing a new or replacement boiler.

There are many factors to think about when investing in a new boiler. If you are unsure of what boiler you need for your home, the blogs listed below may help you gather more knowledge and decide on the perfect boiler for your home. 

This is probably the best time to mention that WarmZilla has a Best Price Guarantee offer that ensures that we will beat any boiler price by £50, if you manage to find a boiler cheaper elsewhere (which you won’t 😉).

If you suspect an issue with your Keston boiler, we have provided a list of their fault/error codes that could help you to identify the issue and potentially point it out to your Gas Safe Engineer.

C36 Combi Gas Boiler Error Codes

Fault CodePossible Cause
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
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 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 CodePossible Cause
0

The 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 CodePossible Cause
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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