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
Low water pressureE 44
Return thermistor open circuit - check/replace connections/thermistorE 37
Flow thermistor open circuit - check/replace connections/thermistorE 36
Return thermistor short circuit - check/replace connections/thermistorE 32
Flow thermistor short circuit - check/replace connections/thermistorE 31
Difference between flow and return temperatures too high. Check circulation.E 30
Fan not rotating - check fan connection and fan for fault.E 28
Flow temperature increased too quickly. Check water circulation.E 25
Maximum return temperature exceeded. Check circulation.E 19
Flow overheat - check water circulationE 18
Thermal fuse blown or flue overheat thermostat activated.E 12
Internal electronics error - rest or replace control boxE 11
Power has been reset whilst boiler was in lockoutE 04
Gas valve faulty or not connectedE 03
No ignition after restart. Check gas supply, gas valve operation and ignitor
electrode spark generation
E 02
Flame detected when not expected. Check boiler earth and probe condition.E 00
Description of faultDisplay
WD536 Chapter 5 : Fault Finding The Keston C45, C40P, C55 & C55P
Installation & Servicing Instructions Page : 30
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