Adjust the LF switch while in this position

CODE	DESCRIPTION	RECOMMENDED TROUBLESHOOTING OF		NOTE
			LOCKOUT CODES
124	High fire switch OFF	1.	Check wiring and correct any potential wiring	H
			errors.
125	High fire switch stuck ON		errors.	H
125	High fire switch stuck ON	2.	Check High Fire Switch to assure proper function	H
		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.
126	Low fire switch OFF	1.	Check wiring and correct any potential wiring	H
			errors.
127	Low fire switch stuck ON		errors.	H or L
127	Low fire switch stuck ON	2.	Check Low Fire Switch to assure proper function	H or L
		2.	Check Low Fire Switch to assure proper function
			(not welded or jumpered).
		3.	Manually drive the motor to the High Fire position
			and adjust the LF switch while in this position and
			verify voltage through the switch to the LFS input
			with a voltmeter.
		4.	If steps 1-3 are correct and the fault persists,
			replace the module.
128	Fan speed failed during prepurge	1.	Check wiring and correct any potential wiring	H or L
			errors.
129	Fan speed failed during preignition		errors.	H or L
129	Fan speed failed during preignition	2.	Check VFDs ability to change speeds.	H or L
130	Fan speed failed during ignition	2.	Check VFDs ability to change speeds.	H or L
130	Fan speed failed during ignition	3.	Change the VFD	H or L
131	Fan movement detected during standby	4.	If the fault persists, replace the module.	H
132	Fan speed failed during run			H
133-135	RESERVED
	Start Check Faults
136	Interrupted Airflow Switch failed to close	1.	Check wiring and correct any possible wiring	H
			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.
137	ILK failed to close	1.	Check wiring and correct any possible shorts.	H
		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.
138-142	RESERVED
	FAULT CODES 149 THROUGH 165 ARE
	OEM SPECIFIC FAULT CODES.
143	Internal fault: Flame bias out of range 1	Contact the service professional.		L
144	Internal fault: Flame bias out of range 2	Contact the service professional.		L
145	Internal fault: Flame bias out of range 3	Contact the service professional.		L
146	Internal fault: Flame bias out of range 4	Contact the service professional.		L
147	Internal fault: Flame bias out of range 5	Contact the service professional.		L
148	Internal fault: Flame bias out of range 6	Contact the service professional.		L
149	Flame detected	OEM Specific		H or L
		1.	Holds if flame detected during Safe Start check
			up to Flame Establishing period.

3400, 1700, 2000, 2600 specifications

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CODE

and adjust the LF switch while in this position and

RESERVED

3400, 1700, 2000, 2600 specifications