Laars MagnaTherm MGH1600 Installation And Operation Instructions For page 97

MagnaTherm Boilers and Water Heaters
122 Lightoff rate proving failed
123 Purge rate proving failed
128 Fan speed failed during prepurge
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
L 1. Check wiring and correct any potential wiring
errors.
2. Check VFD's (Variable-speed Fan Drive) ability
to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
L 1. Check wiring and correct any potential wiring
errors.
2. Check VFD's (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 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.
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