0
Owner's of the A.O. Smith Boiler 3400 gave it a score of 0 out of 5. Here's how the scores stacked up:
64
CODE DESCRIPTION RECOMMENDED TROUBLESHOOTING OF
LOCKOUT CODES
NOTE
94 Header sensor fault 1. Check wiring and correct any possible errors.
2. Replace the header sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
95 Stack sensor fault 1. Check wiring and correct any possible errors.
2. Replace the stack sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
96 Outdoor sensor fault 1. Check wiring and correct any possible errors.
2. Replace the outdoor sensor.
3. If previous steps are correct and fault persists,
replace the module.
H
97 Internal Fault: A2D mismatch. Internal Fault.
1. Reset Module.
2. If fault repeats, replace module.
L
98 Internal Fault: Exceeded VSNSR voltage L
99 Internal Fault: Exceeded 28V voltage tolerance L
100 Pressure Sensor Fault 1. Verify the Pressure Sensor is a 4-20 ma source.
2. Check wiring and correct any possible errors.
3. Test Pressure Sensor for correct operation.
4. Replace the Pressure sensor.
5. If previous steps are correct and fault persists,
replace the module.
H
101-104 RESERVED
Flame Operation Faults
105 Flame detected out of sequence 1. Check that ame is not present in the combustion
chamber. Correct any errors.
2. Make sure that the ame detector is wired to the
correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the ame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
H or L
106 Flame lost in MFEP 1. Check pilot valve (Main Valve for DSI) wiring and
operation - correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, ame
detector, ame detector siting or ame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
L
107 Flame lost early in run L
108 Flame lost in run L
109 Ignition failed L
110 Ignition failure occurred Hold time of recycle and hold option. Will not be a
lockout fault. Hold Only.
H
111 Flame current lower than WEAK threshold Internal hardware test. Not a lockout, H
112 Pilot test ame timeout Interrupted Pilot or DSI application and ame lost
when system in “test” mode.
1. Reset the module to restart.
L
113 Flame circuit timeout Flame sensed during Initiate or off cycle, hold 240
seconds, if present after 240 seconds, lockout.
L
114-121 RESERVED
Rate Proving Faults
122 Lightoff rate proving failed 1. Check wiring and correct any potential wiring
errors.
2. Check VFDs ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
L
123 Purge rate proving failed L
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