Installation, Operation and Maintenance Instructions User guide

LAARS Heating Systems
Page 78
Code Description Lockout
or Hold
Procedure
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. Return to Conguration mode and 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. Return to Conguration mode and 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. Return to Conguration mode and recheck
selected parameters, reverify and reset module.
2. If fault repeats, verify electrical grounding.
3. If fault repeats, replace module.