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Date: 8-4-2010
Revision: 0
Form: 2396
42
Code Description Recommended Troubleshooting of Lockout Codes Code
68 ILK ON This lockout occurs when the interlock string is closed before the
blower starts. The airflow switch is the only device in the
interlock string that will open when in standby. Probable causes
are.
1. Air pressure in the boiler room has become negative.
2. Excessive downdraft in the stack.
3. Blower is spinning before being commanded by the
hydronic control. Make sure blower is not running in
standby.
4. Airflow switch is stuck closed.
L
69 Pilot test hold 1. Verify Run/Test is changed to Run.
2. Reset Module.
3. If fault repeats, replace module.
H
70 Wait for leakage
test completion
1. Internal Fault. Reset Module.
2. If fault repeats, replace module.
H
71-77 RESERVED
78 Demand Lost in
Run
1. Check wiring and correct any possible errors.
2. If previous steps are correct and fault persists, replace the
module.
H
79 Outlet high limit 1. Check wiring and correct any possible errors.
2. Replace the Outlet high limit.
3. If previous steps are correct and fault persists, replace the
module.
H or L
80 DHW high limit 1. Check wiring and correct any possible errors.
2. Replace the DHW high limit.
3. If previous steps are correct and fault persists, replace the
module.
H or L
81 Delta T limit 1. Check Inlet and Outlet sensors and pump circuits for proper
operation.
2. Recheck the Delta T Limit to confirm proper setting.
3. If previous steps are correct and fault persists, replace the
module.
H or L
82 Stack limit 1. Check wiring and correct any possible errors.
2. Replace the Stack high limit.
3. If previous steps are correct and fault persists, replace the
module.
H or L
83-90 RESERVED
91 Inlet sensor fault 1. Check wiring and correct any possible errors.
2. Replace the Inlet sensor.
3. If previous steps are correct and fault persists, replace the
module.
H
92 Outlet sensor fault 1. Check wiring and correct any possible errors.
2. Replace the Outlet sensor.
3. If previous steps are correct and fault persists, replace the
module.
H
93 DHW sensor fault 1. Check wiring and correct any possible errors.
2. Replace the DHW sensor.
3. If previous steps are correct and fault persists, replace the
module.
H
94 Header sensor fault 1. Check wiring and correct any possible errors.
2. Replace the header sensor.
3. If previous steps are correct and fault persists, replace the
module.
H
95 Stack sensor fault 1. Check wiring and correct any possible errors. H