LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 106)

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Service Manual - NeoTherm 500
Appendix 1 - Error Codes (continued)
Code Description L or H Procedure
129 Fan speed failed during preignition H or L 1. Check wiring and correct any potential wiring errors.
See Section B22.
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.
130 Fan speed failed during ignition H or L 1. Check wiring and correct any potential wiring errors.
See Section B22.
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.
131 Fan movement detected during standby H 1. Check wiring and correct any potential wiring errors.
See Section B22.
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.
132 Fan speed failed during run H 1. Check wiring and correct any potential wiring errors.
See Section B22.
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.
137 ILK (Interlock) failed to close H 1. Check wiring and correct any possible shorts.
2. Check interlock (ILK) switches to assure proper func-
tion.
3. Verify voltage through the interlock string to the inter-
lock 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 volt-
age 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.
App1
cont.