MagnaTherm Boilers and Water Heaters
Page 93
122
Lightoff rate proving failed
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.
123
Purge rate proving failed
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.
128
Fan speed failed during prepurge
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.
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.
