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Keston Boiler Repair boiler repair

Keston Boiler Repair

Keston Boiler Repair

  Available 24 hour a day, 7 days a week
  Qualified Keston Boiler Repair specialists
  Gas Safe Registered Engineers
  Fully Insurance approved


Keston Boiler Repair

Do you want your Keston boiler fixed right away? One call to ASAP is all you need to make

Why? Because ASAP has been working with Keston boilers for more than 20 years. In that time, we have got to know all of their models inside and out. This means, when you hire us to fix a Keston, you are drawing upon two decades of specialist knowledge. Also, you are getting ASAP Boiler Repair’s famously fast service. In fact, we focus so much on fixing our customer’s boilers quickly, that our same day repair rate currently stands at 90%.

Keston boilers

Keston has been providing heat to homes all over the UK for the best part of a century. Its back catalogue contains many of the industry’s most famously innovative models. At all times, this standout manufacturer has dedicated itself to solving its customers’ heating problems with truly effective, efficient solutions.

The current Keston range continues these traditions, with a variety of commercial and domestic models, all of which come from the cutting technological edge. Though they are all excellent systems, occasionally Keston boilers need attention. When you suffer a fault with your Keston model, then there is only one number you need.

ASAP Boiler Repair and Keston

ASAP Boiler Repair is London’ number one company for fast response during a boiler emergency. Because we work 24 hours a day, we can be at your location at a time that is suitable for you. If you have dealt in the past with tradespeople who forced you to interrupt your schedule for their visit, you will understand the benefits of our working processes.

We also believe in getting any heating system that we work upon up and running within the shortest period of time possible. In fact, 90% of all the boilers we fix are repaired within a single day, one of the strongest rates in the capital. Plus, our repairs are done to last. We offer all our customers a 12 month guarantee on every part we use on their boiler.

Reasons to choose ASAP

  • Choose ASAP for quality: After 20 years at the head of the pack for heating system repair in London, there is no questioning our authority when it comes to fixing boilers. If you want the best quality there is, then accept no substitutes.
  • Choose ASAP for speed: As you can guess from our name, we specialise in getting boilers fixed as soon as possible. It doesn’t matter what time of day you need us or where you’re located. We will do everything we can to get your system back at its best right away.
  • Choose ASAP for flexibility: Thanks to our round the clock operating hours, we are able to find a visit time that works for you, rather than force you to fit us into your timetable.
  • Choose ASAP for value: Our rates are very low for this top quality level of service, while all quotes are offered at the soonest possible time, keeping you in control of your overall spend.

If you want the best service possible on a Keston boiler, call ASAP Boiler Repair now.

List of potential Keston boiler issues;

Code Potential Issue
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
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
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

Boiler engineers available 24 hours

Our team has worked with every system from every major boiler brand available in the UK. So, regardless of the make or model that you use to heat your home, the engineer who arrives at your door will know it like the back of his hand. Also, we can advise you on any new features or upgrades that you may wish to add.

Book an engineer online!