104
Rev 2.1
3. If previous steps are correct and fault persists, consult
factory.
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, consult
factory.
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, consult
factory.
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, consult
factory.
H
97 Internal Fault: A2D mismatch. Internal Fault.
1. Reset Module.
2. If fault repeats, consult factory.
L
98 Internal Fault: Exceeded VSNSR voltage
tolerance
L
99 Internal Fault: Exceeded 28V voltage tolerance L
105 Flame detected out of sequence 1. Check that flame is not present in the combustion
chamber. Correct any errors.
2. Make sure the UV flame detector wires are protected from
stray noise pickup.
3. Reset and sequence the module, if code reappears,
replace the flame detector.
4. Reset and sequence the module, if code reappears,
consult factory.
H or L
106 Flame lost in MFEP 1. Check pilot valve operation. Correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat Pilot tests.
4. Check pilot assembly ignition electrode and flame detector.
5. If steps 1 through 4 are correct and the fault persists,
consult factory.
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.
Internal hardware test. Not a lockout.
H
111 Flame current lower than WEAK threshold H
112 Pilot test flame Timeout Interrupted Pilot application and flame 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
122 Light off 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, consult factory.
L
123 Purge rate proving failed L
124 High fire switch OFF Internal Fault
1. Reset Module.
2. If fault repeats, consult factory
H
125 High fire switch stuck ON H
126 Low fire switch OFF Internal Fault
1. Reset Module.
2. If fault repeats, consult factory
H
127 Low fire switch stuck ON H
128 Fan speed failed during prepurge 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, consult factory.
129 Fan speed failed during preignition
130 Fan speed failed during ignition
131 Fan movement detected during
Standby
132 Fan speed failed during run
136 Interrupted Airflow Switch failed to
Close
Internal Fault
1. Reset Module.
2. If fault repeats, consult factory
137 ILK failed to close 1. Check wiring and correct any possible shorts.
2. Check Interlock (ILK) switches to assure proper function.
3. Verify voltage through the interlock string to the interlock
input with a voltmeter.
4. If steps 1-3 are correct and the fault persists, consult
factory.
149 Flame detected 1. Holds if flame detected during Safe Start check up to
Flame Establishing period.
150 Flame not detected 1. Sequence returns to standby and restarts sequence at the
beginning of Purge after the HF switch opens. If flame
detected during Safe Start check up to Flame Establishing
period.
151 High fire switch ON Internal Fault
1. Reset Module.
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