FAULT FINDING AND DIAGNOSIS
6 720 803 800 (2012/11) 59
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
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
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