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Date: 8-4-2010
Revision: 0
Form: 2396
44
Code Description Recommended Troubleshooting of Lockout Codes Code
122 Lightoff rate
proving failed
L
123 Purge 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
124 High fire switch
OFF
H
125 High fire switch
stuck ON
H
126 Low fire switch
OFF
H
127 Low fire switch
stuck ON
1. Check wiring and correct any potential wiring errors.
2. Check High Fire Switch to assure proper function (not welded
or jumpered).
3. Manually drive the motor to the High Fire position and adjust
the HF switch while in this position and verify voltage through
the switch to the HFS input with a voltmeter.
4. If steps 1-3 are correct and the fault persists, replace the
module.
H or L
128 Fan speed failed
during prepurge
H or L
129 Fan speed failed
during preignition
H or L
130 Fan speed failed
during ignition
H or L
131 Fan movement
detected during
standby
H
132 Fan speed failed
during run
H
133-
135
RESERVED
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.
136 Interrupted Airflow
Switch failed to
close
1. Check wiring and correct any possible wiring errors.
2. Check Interrupted Airflow switch(es) to assure proper
function.
3. Verify voltage through the airflow switch to the IAS input with
a voltmeter.
4. If steps 1-3 are correct and the fault persists, replace the
module.
H
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, replace the
module.
H
138-
148
RESERVED
FAULT CODES
149 THROUGH
165 ARE OEM
SPECIFIC FAULT
CODES.
149 Flame detected OEM Specific
1. Holds if flame detected during Safe Start check up to Flame
Establishing period.
H or L
150 Flame not detected OEM Specific
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.
H
151 High fire switch ON OEM Specific H or L