FAULT FINDING AND DIAGNOSIS
6 720 803 800 (2012/11)58
7.5 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
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 helpline 0844 892 3366
257 b7 Internal error - replace control board
258 & 259 F0 Internal error call Bosch helpline 0844 892 3366
260 No temperature rise after burner start
261 EA First Safety timing error
262 & 263 F0 Internal error call Bosch helpline 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 timeout error
268 Component test mode
269 EA Ignition device activated too long
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