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Boiler Control Instruction & Operation Manual, Rev 1
Page
54
of 64
Troubleshooting
Lockouts (continued)
Lockout Number
Condition
Possible Cause
109
Ignition failure
Flame failure
-
No gas pressure.
-
Gas pressure under minimum value shown on
rating plate.
-
Gas line not completely purged of air.
-
Defective Electrode.
-
Loose burner ground connection.
-
Defective Ignition Cable.
-
Defective gas valve (check for 24 Vac at harness
during trial for ignition before replacing valve).
-
Air-fuel mixture out of adjustment - consult
factory.
64
Pre-Ignition Interlock (PII)
OFF
Pre-Ignition Interlock Open
-
Open or loose limit
65
Interrupted Airflow Switch
(IAS) OFF
Interrupted Airflow Switch
Open
-
Airflow too low
-
Defective switch
66
Interrupted Airflow Switch
(IAS) ON
Interrupted Airflow Switch
Closed
-
Unexpected airflow
-
Defective switch
-
Miswired
151
High Fire Switch Fault
High Fire Switch Closed
-
Miswired
-
Defective switch
123-130, 132
Fan Failed
Fan speed failed
-
Miswired
-
VFD failed to check speed
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.
-
Air pressure in the boiler room has become
negative.
-
Excessive downdraft in the stack.
-
Blower is spinning before being commanded by
the hydronic control. Make sure blower is not
running in standby.
-
Airflow switch is stuck closed.
53
AC Phase Fault
AC inputs phase reversed
-
Check the control and display connection.
-
Check the control power supply and make sure
that both frequency and voltage meet the specs
-
Ensure 24 Vac is functioning properly
112
Pilot Test Flame
Pilot Test Flame Timeout
-
Pilot test flame timed out. Reset the control to
restart.
106-108
Flame Lost
Flame lost in MFEP
-
Pilot Valve (main Valve for DSI)
-
Fuel Supply - No gas pressure, Gas pressure
under minimum value shown on rating plate, Gas
line not purged
-
Defective flame sensor
-
Loose ground
-
Air/fuel mix out of adjustment
Flame Lost early in RUN
Flam Lost in RUN
284
Memory Reset To Default
OEM Memory Lost, Honeywell
Default Memory Restored
-
Controller Failure
-
Consult Factory
-
Replace Control