ERROR CODES
As E41E99
Flue sensor open circuit - check connections to flue sensor are in placeE46
Flue sensor short circuit - check connections to flue sensorE45
Return sensor open circuit - check connections to return sensor are in placeE44
Return sensor short circuit - check connections to return sensorE43
Communication error between fascia and control box - check cablesE41
Water pressure too high - check expansion vessel charge and operationE40
Reset key fault - replace fascia PCBE38
Water pressure error - check system pressure and pressure sensorE37
Mains supply frequency incorrect - Check mains voltage system in dwellingE35
Mains supply voltage < 180V - Check mains voltage system in dwellingE34
DHW sensor open circuit - check connections to DHW sensor are in placeE33
DHW sensor short circuit - check connections to DHW sensorE32
Flow sensor open circuit - check connections to flow sensor are in placeE31
Flow sensor short circuit - check connections to flow sensorE30
Flame signal lost 5 times in 4 minutes - The flame is unstable, check
combustion, gas supply, air supply and flue.
E26
Control box errors - possible faulty control box.E25
Water pressure lost 4 times in 24 hours - possible leak, check system and boiler.E24
Water filling error - check water pressure sensor.E23
Control box errors - possible faulty control box.E12 to E22
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.
E11
Control box errors - possible faulty control box.E10
Valve drive error - possible gas valve or control box fault.E09
Flame circuit error - possible control box fault..E08
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
E07
Fan failure - boiler cannot detect fan rotation. Check fan operation and BOTH
connectors onto fan.
E05
Boiler overheat - check system for blockage, by-pass provision and pump
operation
E03
False flame - the unit is detecting a flame BEFORE ignition. Check gas valve
closure, power supply polarity and voltage and earth connection.
E02
Ignition failure - the boiler has attempted to light five times and not succeeded -
check gas supply, air supply, flue, ignitor condition and spark gap.
E01
Description of faultDisplay
WD388/0/2004 Chapter 6 : Fault Finding The Keston C36 & C36P Combi Boilers
Installation & Servicing Instructions Page : 30
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