A.O. Smith 100 Series Service Handbook page 61

CODE
30 Internal fault: Flame bias shorted to adjacent pin
31 Internal fault: SLO electronics unknown error
32 - 46 Internal fault: Safety Key 0 through 14
System Errors
47 Flame Rod to ground leakage
48 Static flame (not flickering)
49 24VAC voltage low/high
50 Modulation fault
51 Pump fault
52 Motor tachometer fault
53 AC inputs phase reversed
54 Safety GVT model ID does not match application's
model ID
55 Application configuration data block CRC errors
56 - 57 RESERVED
58 Internal fault: HFS shorted to IAS
59 Internal Fault: Mux pin shorted
Normal Event Status
60 Internal Fault: HFS shorted to LFS
61 Anti short cycle
62 Fan speed not proved
63 LCI OFF
64 PII OFF
65 Interrupted Airflow Switch OFF
66 Interrupted Airflow Switch ON
DESCRIPTION
Servicing should only be performed by a Qualified Service Agent
RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
1. Check the Module and display connections.
2. Check the Module power supply and make sure
that both frequency, voltage and VA meet the
specifications.
Internal sub-system fault.
1. Review alert messages for possible trends.
2. Correct possible problems.
3. If fault persists, replace module.
1. Check the Module and display connections.
2. Check the Module power supply and make
sure that both frequency and voltage meet the
specifications.
3. On 24Vac applications, assure that J4-10 and
J8-2 are connected together.
Contact the qualified service technician.
Contact the qualified service technician.
Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
Will not be a lockout fault. Hold Only.
1. Check wiring and correct any faults.
2. Check Interlocks connected to the LCI to assure
proper function.
3. Reset and sequence the module; monitor the LCI
status.
4. If code persists, replace the module.
1. Check wiring and correct any faults.
2. Check Preignition Interlock switches to assure
proper functioning.
3. Check the valve operation.
4. Reset and sequence the module; monitor the PII
status.
5. If code persists, replace the module.
1. Check wiring and correct any possible shorts.
2. Check airflow switches to assure proper
functioning.
3. Check the fan/blower operation.
4. Reset and sequence the module; monitor the
airflow status.
5. If code persists, replace the module.
NOTE
H
H
L
H
H
H
H
H
H
L
L
L
L
L
L
H
H
H
H or L
H or L
H or L
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