LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 80)

LAARS Heating Systems Page 76
Code Description Lockout
or Hold
Procedure
129 Fan speed failed during preignition H or L 1. Check wiring and correct any potential wiring
errors.
2. Check the VFDs (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
130 Fan speed failed during ignition H or L 1. Check wiring and correct any potential wiring
errors.
2. Check the VFDs (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
131 Fan movement detected during standby H 1. Check wiring and correct any potential wiring
errors.
2. Check the VFDs (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
132 Fan speed failed during run H 1. Check wiring and correct any potential wiring
errors.
2. Check the VFDs (Variable-speed Fan Drive)
ability to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
137 ILK (Interlock) failed to close H 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.
149 Flame detected H or L
Holds if flame detected during Safe Start check up
to Flame Establishing period.
150 Flame not detected H 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.
154 Purge Fan switch On H or L 1. Purge fan switch is on when it should be off.
2. Check wiring and correct any errors.
3. Inspect the Purge Fan switch J6 terminal 3 and
its connections. Make sure the switch is working
correctly and is not jumpered or welded.
4. Reset and sequence the relay module.
5. If the fault persists, replace the relay module.