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FAULT FINDING AND DIAGNOSTICS
Product Name
6 720 ... ... (YYYY/MM)
239
F0
Watchdog relay error
240
D1
Return sensor shorted
241
D1
Return sensor disconnected
242 to
256
F0
Internal error call Bosch technical help-line
257
b7
Internal error - replace control board
258 &
259
F0
Internal error call Bosch technical help-line
260
No temperature rise after burner start
261
EA
First Safety timing error
262 &
263
F0
Internal error call Bosch technical help-line
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
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
Status
codes
Fault
codes
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
329
CE
No pressure variation detected after switching pump
332
E5
Supply sensor exceeded 110°C
333
Start temporarily not allowed due to flow error on CH
338
F0
Too many short burner starts without confirmation of
water flow
341
D4
CH: supply and/or return temperatures rising too fast
342
D4
HW: supply temperature rising too fast
343
ED
CH: flue gas temperature rising but supply
temperature not
344
ED
HW: flue gas temperature rising but supply
temperature not
345
EF
Supply and/or return temperatures do not change
after burner start
346
EC
Flue gas temperature rising too fast
347
E3
Return temperature higher than supply temperature
(some time after burner start)
348
EE
HW: supply temperature too hot
349
EF
CH: Boil Detect, large delta T despite minimum
burner load
350
E2
Flow sensor shorted 351 'E2' Flow sensor
disconnected
353
--
Burn temporarily blocked due to no 20 minute
continuous OFF time in last 24 hours.
354
Overpressure setting erased
357
Primary Heat Exchanger air venting program active -
approximately 100 seconds
358
Three way valve kick
359
DHW outlet temperature too hot
364
FA
Gas valve EV2 leak test failed
365
Fb
Gas valve EV1 leak test failed
372
Temporarily ignoring CH requests to limit
temperatures of the appliance components
373
8C
SuperLock caused by too frequent thermostat
overheat detections during burning
374
8C
SuperLock caused by too frequent ionisation loss
during burning
375
E4
Preheat sensor on DHW inlet Short Circuit
376
E4
Preheat sensor on DHW Inlet Open Circuit
380
Inlet temperature greater than DHW Outlet Set point
800
CC
Outdoor sensor defect
808
A7
Domestic hot water sensor defect
810
Domestic hot water remains cold
828
Water pressure sensor defect
Status
codes
Fault
codes
Содержание Condens 2000F16 Regular boiler
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