A.O. Smith 100 Series Service Handbook page 72

CODE
304 Abnormal Recycle: ILK off during Measured Purge
Time
305 Abnormal Recycle: ILK off during Drive to Lightoff
Rate
306 Abnormal Recycle: ILK off during Pre-Ignition test
307 Abnormal Recycle: ILK off during Pre-Ignition time
308 Abnormal Recycle: ILK off during Main Flame
Establishing Period
309 Abnormal Recycle: ILK off during Ignition period
310 Run was terminated due to ILK was off
311 Run was terminated due to interrupted air flow
switch was off
312 Stuck reset switch
313 Run was terminated due to fan failure
314 Abnormal Recycle: Fan failed during Drive to
Purge Rate
315 Abnormal Recycle: Fan failed during Measured
Purge Time
316 Abnormal Recycle: Fan failed during Drive to
Lightoff Rate
317 Abnormal Recycle: Fan failed during Pre-Ignition
test
318 Abnormal Recycle: Fan failed during Pre-Ignition
time
319 Abnormal Recycle: Fan failed during Ignition
period
320 Abnormal Recycle: Fan failed during Main Flame
Establishing Period
321 Abnormal Recycle: Main Valve off after 10
seconds of RUN
322 Abnormal Recycle: Pilot Valve off after 10 seconds
of RUN
323 Abnormal Recycle: Safety Relay off after 10
seconds of RUN
324 Abnormal Recycle: Hardware flame bias
325 Abnormal Recycle: Hardware static flame
326 Abnormal Recycle: Hardware flame current invalid
327 Abnormal Recycle: Hardware flame rod short
328 Abnormal Recycle: Hardware invalid power
329 Abnormal Recycle: Hardware invalid AC line
330 Abnormal Recycle: Hardware SLO flame ripple
330 Abnormal Recycle: Hardware SLO flame sample
332 Abnormal Recycle: Hardware SLO flame bias
range
333 Abnormal Recycle: Hardware SLO flame bias heat
334 Abnormal Recycle: Hardware SLO spark stuck
335 Abnormal Recycle: Hardware SLO spark changed
336 Abnormal Recycle: Hardware SLO static flame
337 Abnormal Recycle: Hardware SLO rod shorted
338 Abnormal Recycle: Hardware SLO AD linearity
339 Abnormal Recycle: Hardware SLO bias not set
340 Abnormal Recycle: Hardware SLO bias shorted
72
DESCRIPTION
Servicing should only be performed by a Qualified Service Agent
CODE
341 Abnormal Recycle: Hardware SLO electronics
342 Abnormal Recycle: Hardware processor clock
343 Abnormal Recycle: Hardware AC phase
344 Abnormal Recycle: Hardware A2D mismatch
345 Abnormal Recycle: Hardware VSNSR A2D
346 Abnormal Recycle: Hardware 28V A2D
347 Abnormal Recycle: Hardware HFS IAS shorted
348 Abnormal Recycle: Hardware PII INTLK shorted
349 Abnormal Recycle: Hardware HFS LCI shorted
350 Abnormal Recycle: Hardware HFS LFS shorted
351 Abnormal Recycle: Invalid zero crossing
352 Abnormal Recycle: fault stack sensor
353 Abnormal Recycle: stack limit
354 Abnormal Recycle: delta T limit
355 Abnormal Recycle: fault outlet sensor
356 Abnormal Recycle: outlet high limit
357 Abnormal Recycle: fault DHW sensor
358 Abnormal Recycle: DHW high limit
359 Abnormal Recycle: fault inlet sensor
360 Abnormal Recycle: Check Parameters Failed
Internal Errors
361 Internal error: No factory parameters were
detected in control
362 Internal error: PID iteration frequency was invalid
363 Internal error: Demand-Rate interval time was
invalid
364 Internal error: Factory calibration parameter for
modulation was invalid
365 Internal error: CH PID P-scaler was invalid
366 Internal error: CH PID I-scaler was invalid
367 Internal error: CH PID D-scaler was invalid
368 Internal error: DHW PID P-scaler was invalid
369 Internal error: DHW PID I-scaler was invalid
370 Internal error: DHW PID D-scaler was invalid
371 Internal error: Lead Lag master PID P-scaler was
invalid
372 Internal error: Lead Lag master PID I-scaler was
invalid
373 Internal error: Lead Lag master PID D-scaler was
invalid
374 Abnormal Recycle: Hardware flame bias high
375 Abnormal Recycle: Hardware flame bias low
376 Abnormal Recycle: Hardware flame bias delta high
377 Abnormal Recycle: Hardware flame bias delta low
378 Abnormal Recycle: Hardware flame bias dynamic
high
379 Abnormal Recycle: Hardware flame bias dynamic
low
380 Abnormal Recycle: Fan Speed Not Proven
381 Abnormal Recycle: Fan Speed Range Low
DESCRIPTION