Worcester Greenstar Heatslave II External 12/18

FAULT FINDING & DIAGNOSIS
RESET & LOCKING ERROR
FAULT FINDING & DIAGNOSIS
RESET & LOCKING ERROR
INSTALLATION & SERVICING INSTRUCTIONS FOR GREENSTAR HEATSLAVE II EXTERNAL 12/18-18/25-25/32
6 720 805 210-01
55
FAULT FI NDI NG
& DIAGNOSIS
Reset to factory settings:
To reset changes made in Menu 2 back to the
factory default setting:
NOTE: Any changes made to Menu 1 are not
reset by these actions.
14 Press and hold the and
buttons for at least 5 seconds. The screen
will then display code BE with the spanner
symbol.
24 Press the button and ‘reset’ will be
displayed with the tick symbol for 3
seconds. After 3 seconds the display will
revert to the normal operation screen.
Locking Error:
Should a fault develop with this boiler (or the
system), the boiler will enter into a Locking or
Blocking condition.
Locking condition:
l The boiler display will flash a warning
triangle.
l An alpha numeric fault code will be
displayed indicating the fault group.
l A 3 digit cause code will flash on the
display during a Locking error.
Manual intervention is required following
clearance of the fault.
4 Press the reset button on the boiler
fascia.
1
2
Fault
code
Cause
code
Description Reset
type
Possible cause
9U 233 BCM (Boiler Control
Module)
Reset
button
Code plug missing or defective.
E2 222
223
Flow sensor short
circuit
Flow sensor open
circuit
Reset
button
Reset
button
Flow sensor shorted or damaged.
Flow sensor disconnected or damaged.
E5 218
332
Flow temperature too
high
Primary flow has
exceeded 105°C
Reset
button
Reset
button
Primary sensor overheated.
Primary sensor overheated.
E9 219
220
221
210
Safety temperature too
high
Safety sensor short
circuit
Safety sensor open
circuit
Max temperature
thermostat activated
Reset
button
Reset
button
Reset
button
Reset
button
The main heat exchanger has overheated.
Maximum temperature 105°C.
Maximum temperature sensor on the main heat
exchanger has failed.
Maximum temperature sensor on the main heat
exchanger has not been recognised.
Flue gas or tank thermostat overheat. Reset the
overheat thermostat before resetting the appliance.
F0 239
241-
255
259
262
267
279
290
278
Internal error
Sensor test failed Reset
button
Probable PCB fault.
On power up all safety sensors are checked.
Check has failed.
Fault Codes - Locking error: