CULKIN PLUMBING AND HEATING

Keston C40 C55 Fault error codes E03 E44

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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 

Code Description Our comments

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

E12 

Thermal fuse blown or flue overheat thermostat activated.

E18 

Flow overheat - check water circulation

E19 

Maximum return temperature exceeded. Check circulation.

E25 

Flow temperature increased too quickly. Check water circulation.

E28 

Fan not rotating - check fan connection and fan for fault. 

E30 

Difference between flow and return temperatures too high. Check circulation. Possible pump failure

E31 

Flow thermistor short circuit - check/replace connections/thermistor check for leaks, water causing short circuit

E32 

Return thermistor short circuit - check/replace connections/thermistor 

check for leaks, water causing short circuit

E36 

Flow thermistor open circuit - check/replace connections/thermistor 

check for leaks, water causing short circuit

E37 

Return thermistor open circuit - check/replace connections/thermistor 

check for leaks, water causing short circuit

E44 

Low water pressure 

Check for leaks check PRV, expansion vessel

 

 

BOCK CODES

Code Description Our comments

B18 Flow temperature exceed 95

B19 Return temperature exceeded 95

B24 Return temperature exceeded flow temperature. Check pump direction on boiler

B25 Flow temperature climbing too quickly. Possible air lock or circulation blockage

B26 Low water pressure Check for leaks check PRV, expansion vessel

B28 No signal from fan. Possible fan disconnected or faulty

B29 Incorrect signal from fan. Possible fan faulty

B30 Difference between flow and return temperatures too high. Check water circulation Possible pump failure 

B65 Waiting for fan to start

 

 

 

 

 

 

and any external pumps. Check wires on flow and return thermistors are not

crossed.

B 25

Flow temperature climbing too quickly. Possible air lock or circulation blockage

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