Keston Boiler Error Codes

Keston Boiler Error Codes

Keston Boiler Error Codes

Designed to meet the needs of both domestic and light commercial situations, Keston’s wide range of appliances are quick and easy to install, built with state-of-the-art tried and tested technology, and provide total peace of mind reassurance.

Occasionally some things can go wrong, that’s why we’ve created our handy at-a-glance table of Keston error codes below and our guide to Keston Boiler Problems and Repair Advice.

Should you need professional help with your broken Keston boiler, then simply use one of our enquiry forms and we will connect you with the best heating engineers local to you.


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C36 Combi Gas Boiler
S30 System Gas Boiler
C40 C55 Combi

C36 Combi Gas Boiler Error Codes


Listed below are the error codes that you may see on a C36 Combi Gas Boiler.

Fault Code Possible Cause
E01 Ignition failure – the boiler has attempted to light five times and not succeeded – check the gas supply is on
E02 False flame – There is possibly a problem with the power supply
E03 Boiler overheat – Check that any valves to the heating circuit have not been shut down, that there is 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 (Installer numbers 7 and 3 above). 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 DHW sensor
E33 DHW sensor short circuit – check connections to DHW sensor are in place
E34 Mains supply voltage < 180V – There may be a problem with your power supply
E35 Mains supply frequency incorrect – There may be a problem with your power supply
E37 Water pressure error – You must top up the water pressure for your system
E38 Reset key fault – replace fascia PCB
E40 Water pressure too high – You have put too much water pressure in your system
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


Listed below are the error codes that you may see on a Keston gas boiler.

Fault Code Possible Cause
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 PCB Fault
L5 5 Boiler Resets in 15 minutes
L6 False Flame Lockout
C0 BCC Activation Fault
C2 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


Listed below are the error codes that you may see on a C40 C55 Combi Gas Boiler.

Fault Code Possible Cause
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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