FAULT FINDING AND DIAGNOSIS
Greenstar i System Compact - 6 720 807 726 (2013/05) 57
7.4 INFORMATION AND SERVICE MENUS
STATUS CODES
During normal boiler operation various Status codes can be displayed by
pressing the button.
The first screen of the Information menu displays the current Status
code, this will change as the boiler runs through the various modes and
sequences.
These are not always faults, but just provide information concerning the
current status of the boiler.
Status
codes
Fault
codes
200 CH System is being heated
201 DHW system is being heated
202 Anti rapid cycle mode for CH
203 System stand by
204 System waiting, primary flow temperature above
setpoint
205 Waiting for airflow
207 CE System pressure too low
208 Test mode active due chimney switch
210 E9 Flue-gas thermostat activated
211 TTB opened (thermal kickback device)
212 Safety or flow temperature rises too fast
213 D4 Temperature difference between supply and return
exceeding limit
214 C7 Fan not running
215 C6 Fan running too fast
216 C6 Fan running too slow
217 C7 No airflow after defined period of time
218 E5 Flow temperature too high
219 E9 Safety sensor temperature too high
220 E9 Safety sensor shorted
221 E9 Safety sensor disconnected
222 E2 Flow sensor shorted
223 E2 Flow sensor disconnected
224 E9 MAX thermostat activated
225 Difference between flow and safety exceeding limit
(bi-sensor only)
227 EA No ionisation detected after ignition
228 F7 Ionisation current detected before burner-start
229 EA Loss of ionisation signal during operation
230 EA Ionisation signal out of bounds
231 FD Mains power error - electrical power interruption
232 D3 external cut-off switch activated
233 9U HCM problem
234 EA Gas valve coil disconnected
237 C4 Airflow present during last 24 hours - fan running
continuously
238 F0 Gas valve error
239 F0 Watchdog relay error
240 D1 Return sensor shorted
241 D1 Return sensor disconnected
242 to
256
F0 Internal error call Bosch help line 0844 892 3366
257 b7 Internal error - replace control board
258 &
259
F0 Internal error call Bosch help line 0844 892 3366
260 No temperature rise after burner start
261 EA First Safety timing error
262 &
263
F0 Internal error call Bosch help line 0844 892 3366
264 C1 Airflow stopped during operation
265 Stand-by mode forced due to energy transfer limit
266 CE No pressure variation detected after switching pump
267 F0 Watchdog time-out error
268 Component test mode
269 EA Ignition device activated too long
270 Power up mode
271 D4 Temperature difference between flow and safety
sensor exceeding limit
272 F0 Internal error
273 C4 Airflow present during last 24 hours
274 Ionisation signal present during last 24 hours
276 E9 Flow temperature exceeded 95°
277 E9 Safety sensor temperature exceeded 95°
278 F0 Sensor test failed
279 F0 AD converter error, unstable measurement
280 F0 Recycle timing error
281 A1 Pump stuck or running in air
282 H5 No feedback from pump
283 Burner starting
284 Gas valve(s) opened, first safety time started
285 E9 Return temperature exceeded 95°C
286 D1 Return temperature too high
287 F0 Ionisation sensor shorted
288 CF Water pressure sensor not connected or short-circuit
to supply
289 CF Water pressure sensor not connected or short-circuit
to ground
290 F0 AD converter reference error
305 Anti fast cycle mode for DHW
306 FA Ionisation detected after burner stop
307 Pump stuck
308 Pump running in air
309 CH & DHW system are being heated
310 CUS communication error
311 CUS locked
312 CUS blocked
313 CUS reported error condition
314 Mains disconnected during super lockout
315 Several times lack of water flow
316 E9 Flue gas sensor temperature too high
317 A3 Flue gas sensor shorted
318 E9 Flue gas sensor disconnected
321 Self-test of flue gas supervision
322 Code error
323 A8 EMS communication error
324 DHW-NTC defect
325 DHW-NTC not correctly installed
326 Storage-NTC defect
327 Reset-key stuck or short-circuit
328 Internal error
Status
codes
Fault
codes
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