Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 86

Page 82
Code Description
129 Fan speed failed during preignition
130 Fan speed failed during ignition
131 Fan movement detected during standby
132 Fan speed failed during run
137 ILK (Interlock) failed to close
149 Flame detected
150 Flame not detected
154 Purge Fan switch On
Lockout Procedure
or Hold
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.
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.
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.
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.
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.
H or L Holds if flame detected during Safe Start check up
to Flame Establishing period.
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.
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.
LAARS Heating Systems