Laars NTV, Installation And Operation Instructions Manual

Page: 71 / 92

Page 67
N
EO
T
HERM
Boilers and Water Heaters
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, fl ame detector, fl ame detector
siting or fl ame 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 seconds, if present
after 240 seconds, system will lockout.
119 Control
Interaction Fault
H Flap valve identifi cations confi gured 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 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.