• Jeff Culkin

Identifiable fault codes recurring and intermittent issues‎ - Keston C40 C55 Fault error codes E03 E


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


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