LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 85)

Page 81 N eo T herm Boilers and Water heaters
108 Flame lost in run L 1. Check main valve wiring and operation - correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame detector, flame detector
siting or flame rod position.
5. If steps 1 through 4 are correct and the fault persists, replace the
module.
109 Ignition failed L 1. Check the main valve wiring and operation - correct any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame detector, flame detector
siting or flame rod position.
5. If steps 1 through 4 are correct and the fault persists, replace the
module.
110 Ignition failure occurred H Hold time of recycle and hold option. Will not be a lockout fault. Hold
only. Internal hardware test. Not a lockout.
111 Flame current lower than weak
threshold
H Hold time of recycle and hold option. Will not be a lockout fault. Hold
only. Internal hardware test. Not a lockout.
113 Flame circuit timeout L Flame sensed during initiate or off cycle. Produces a Hold for 240
seconds. If still present after 240 seconds, system will lockout.
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.
Code Description L or H Procedure