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 Configuration 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 Configuration 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 Configuration mode and recheck
selected parameters, reverify and reset module.
2. if fault repeats, verify electrical grounding.
3. if fault repeats, replace module.
