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