LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 87)

Page 83 N eo T herm Boilers and Water heaters
159 Main valve Off L 1. Check the main valve terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the
module.
160 Ignition On L 1. Check Ignition terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the
module.
161 Ignition Off L 1. Check the ignition terminal wiring and correct any errors.
2. Reset and sequence the module. If fault persists, replace the
module.
164 Block intake On L 1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure it is working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the voltage across the switch.
Supply voltage should be present. If not, the Block Intake Switch is
defective and needs replacing.
5. If the fault persists, replace the relay module.
165 Block intake Off L 1. Check wiring and correct any errors.
2. Inspect the Block Intake Switch to make sure it is working correctly.
3. Reset and sequence the module.
4. During Standby and Purge, measure the voltage across the switch.
Supply voltage should be present. If not, the Block Intake Switch is
defective and needs replacing.
5. If the fault persists, replace the relay module.
172 Main relay feedback incorrect L Internal fault.
1. Reset module.
2. If fault repeats, replace module.
174 Safety relay feedback incorrect L Internal fault.
1. Reset module.
2. If fault repeats, replace module.
175 Safety relay open L Internal fault.
1. Reset module.
2. If fault repeats, replace module.
176 Main relay On at safe start check L Internal fault.
1. Reset Module.
2. If fault repeats, replace module.
178 Safety relay On at safe start
check
L Internal fault.
1. Reset module.
2. If fault repeats, replace module.
184 Invalid Blower/ HSI output setting L 1. Recheck selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
185 Invalid Delta T limit enable
setting
L 1. Recheck selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
186 Invalid Delta T limit response
setting
L 1. Recheck selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.
Code Description L or H Procedure