Lockout; Error Codes - Keston C40 Installation And Servicing Instructions

WD265/0/2002

5.3.2 LOCKOUT

If the fault is persistent or more severe the boiler will lockout with a error code. When the boiler
has entered this error mode it will not attempt to restart until the "Reset" button is pressed.

ERROR CODES

Display Description of fault
E 00 Flame detected when not expected. Check boiler earth and probe condition.
E 02 No ignition after restart. Check gas supply, gas valve operation and ignitor
electrode spark generation
E 03 Gas valve faulty or not connected
E 04 Power has been reset whilst boiler was in lockout
E 11 Internal electronics error - rest or replace control box
E 12 Thermal fuse blown or flue overheat thermostat activated.
E 18 Flow overheat - check water circulation
E 19 Maximum return temperature exceeded. Check circulation.
E 25 Flow temperature increased too quickly. Check water circulation.
E 28 Fan not rotating - check fan connection and fan for fault.
E 30 Difference between flow and return temperatures too high. Check circulation.
E 31 Flow thermistor short circuit - check/replace connections/thermistor
E 32 Return thermistor short circuit - check/replace connections/thermistor
E 36 Flow thermistor open circuit - check/replace connections/thermistor
E 37 Return thermistor open circuit - check/replace connections/thermistor
E 44 Low water pressure
Installation & Servicing Instructions
Chapter 5 : Fault Finding The Keston C40, C40P, C55 & C55P
Page : 27