LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 105)

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Service Manual - NeoTherm 500
Appendix 1 - Error Codes (continued)
Code Description L or H Procedure
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 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, hold 240 sec-
onds, if present after 240 seconds, system will lockout.
119 Control Interaction fault H Flap valve identifications configured incorrectly.
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 VFD’s (Variable-speed Fan Drive) ability
to change speeds.
3. Change the VFD
4. If the fault persists, replace the module.
App1
cont.