FAULT FINDING AND DIAGNOSIS
Greenstar i System Compact - 6 720 807 726 (2013/05)64
7.5 FAULT CODES
Should a fault develop with this boiler (or the system), the boiler will enter a locking or blocking condition, and fault code information will be generated
as described in this section.
LOCKING ERRORS
Locking error The boiler display will flash a warning triangle and fault code. At the same time a (static) cause code will also be displayed. Manual
intervention is required following clearance of the fault:
▶ Press the reset button on the boiler fascia
Blocking error The boiler will stop operating with no fault data displayed. The cause code, in the info menu, is accessed by pressing the spanner/
return button. The condition will clear automatically when the associated fault clears e.g. waiting for an area to cool. In some cases a
blocking error has a defined time duration prior to changing to a locking condition.
Fault code Alpha numeric code indicating the fault group
Cause code Three digit number. During a blocking error (or normal operating status) it is not displayed, but accessed in the info menu via the
spanner/return button. During a locking error the cause code flashes on the display.
Maintenance
codes
These are displayed with the letter H followed by a number. The code advises of a situation that will need some attention but is not a
fault that will stop the boiler from functioning. Some of the common ones are listed:
H11
H13
Hot water outlet sensor defect, hot water can still be delivered but with less control (sensor open/short circuit or out of position)
A time has been set in the Service interval function i.e. 1 to 72 months and that time has expired. Menu 2.5F allows this feature to be
set (1 to 72), a 0 will disable this function.
Fault codes
Cause
codes
Description Reset type Possible cause
9A 362 HCM (Heat Control Module) Reset button Incorrect HCM fitted
9U 233 HCM (Heat Control Module) Reset button Problem with the code plug (faulty or not connected)
b7 257 Internal error Replace control board.
C6 215 Fan problem Reset button Fan running too fast
216
Fan problem Reset button Fan running too slow
C7 214 Fan problem Reset button Fan not running
217 No airflow after a defined period of
time
Reset button Fan not running or airflow blocked
D1 240 Return sensor error Reset button Sensor wet or damaged (the boiler will block for 300 seconds
before this condition).
241
Return sensor error Reset button Sensor disconnected or damaged (the boiler will block for 300
seconds before this condition).
286
Return temperature too high Reset button Boiler overheat
E2 222 Flow sensor short circuit Reset button Flow sensor shorted or damaged.
223
Flow sensor open circuit Reset button Flow sensor disconnected or damaged.
E5 218 Flow temperature too high Reset button Primary flow sensor overheated
332
Primary flow sensor has exceeded
110°C
Reset button Primary flow sensor overheated
E9 219 Safety sensor temperature too high Reset button The main heat exchanger has overheated.
Maximum temperature 105C°
220
Safety sensor short circuit Reset button Maximum temperature sensor on the main heat exchanger has
failed.
221
Safety sensor open circuit Reset button Maximum temperature sensor on the main heat exchanger has not
been recognised.
224
Max temperature thermostat
activated
Reset button Flue gas thermostat overheat
EA 227 No flame detected after ignition Reset button Failure of four ignition attempts. The boiler waits 30 seconds before
another attempt is made.
229
Loss of flame signal during operation Reset button An established flame has been extinguished.
This could be caused by:
• moisture in the sump, due to a blocked sump/condensate trap.
• a strong wind into the flue.
234
Gas valve error Reset button Gas valve coil disconnected
261
Ignition timing error Reset button Flame not established during the first 4 seconds ignition period.
Table 20 Locking fault and cause code listing
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