LAARS NeoTherm NTV1000 - Install and Operating Manual - Manual (Page 113)

NeoTherm Boilers and Water Heaters Page 109
Code Description L or
H
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.
152 Combustion pressure ON H or
L
1. Check wiring and correct any errors.
2. Inspect the Combustion Pressure Switch to
make sure it is working correctly.
3. Reset and sequence the relay module.
4. During STANDBY and PREPURGE, measure
the voltage between J6 terminal 5 and L2 (N).
Supply voltage should be present. If not, the
lockout switch is defective and needs replacing.
5. If the fault persists, replace the relay module.