A.O. Smith 100 Series Service Handbook page 66

CODE
164 Block intake ON
165 Block intake OFF
166-171 RESERVED
Feedback
172 Main relay feedback incorrect
173 Pilot relay feedback incorrect
174 Safety relay feedback incorrect
175 Safety relay open
176 Main relay ON at safe start check
177 Pilot relay ON at safe start check
178 Safety relay ON at safe start check
179-183 RESERVED
Parameter Faults
184 Invalid BLOWER/HSI output setting
185 Invalid Delta T limit enable setting
186 Invalid Delta T limit response setting
187 Invalid DHW high limit enable setting
188 Invalid DHW high limit response setting
189 Invalid Flame sensor type setting
190 Invalid interrupted air switch enable setting
191 Invalid interrupted air switch start check enable
setting
192 Invalid igniter on during setting
193 Invalid ignite failure delay setting
194 Invalid ignite failure response setting
195 Invalid ignite failure retries setting
196 Invalid ignition source setting
197 Invalid interlock open response setting
198 Invalid interlock start check setting
199 Invalid LCI enable setting
200 Invalid lightoff rate setting
201 Invalid lightoff rate proving setting
202 Invalid Main Flame Establishing Period time
203 Invalid MFEP flame failure response setting
204 Invalid NTC sensor type setting
205 Invalid Outlet high limit response setting
206 Invalid Pilot Flame Establishing Period setting
207 Invalid PII enable setting
208 Invalid pilot test hold setting
209 Invalid Pilot type setting
210 Invalid Postpurge time setting
211 Invalid Power up with lockout setting
66
DESCRIPTION
Servicing should only be performed by a Qualified Service Agent
RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
OEM Specific.
1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure it is
working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the voltage
across the switch. Supply voltage should
be present. If not, the Block Intake Switch is
defective and needs replacing.
5. If the fault persists, replace the relay module.
Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
1. Return to Configuration mode and recheck
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
1. Return to Configuration mode and recheck
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
NOTE
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