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105337-03 - 5/15
II. Troubleshooting
(continued)
Lockout
Number
Condition
Possible Cause
13
Flame rod
shorted to ground
• Flame rod shorted to ground
• Condensate Trap plugged.
• Shorted or mis-wired flame rode wiring.
• Defective flame rod.
• Plugged drain line in trap.
14
DT inlet/outlet high
Temperature rise between supply and return
is too high.
• Inadequate boiler water flow. Verify that circulator is operating and that
circulator and piping are sized per K2 Installation Instructions Manual,
Water Piping and Trim Section.
15
Return temp
higher than supply
The Control is reading a return sensor
temperature higher than the supply sensor
temperature. Condition must be present for
at least 75 seconds for this error code to
appear.
• Flow through boiler reversed. Verify correct piping and circulator
orientation.
• No boiler water flow. Verify that system is purged of air and that appropriate
valves are open.
• Sensor wiring reversed.
• Supply or return sensor defective.
16
Supply temp has
risen too quickly
Supply water temperature has risen too
quickly.
• See possible causes for “Hard Lockout 4”.
• Inadequate boiler water flow.
• Verify that circulator is operating and that circulator and piping are sized
per K2 Installation Instructions Manual, Water Piping and Trim Section.
17
Blower speed
not proved
Normal waiting for blower speed to match
purge and light-off setpoint.
27
Interrupted Airflow
Switch On
Interrupted Airflow Switch Failed in closed
position
The air proving switch has failed on, check switch is operating properly
27 or 28
Interrupted Airflow
Switch Off
Interrupted Airflow Switch Failed to Close
The air proving switch has failed to close;
• Check switch, check switch connection and wiring.
• Blocked vent, blocked inlet, blocked or disconnected inlet air switch tube,
blocked heat exchanger or burner.
• Something is blocking air/flue gas flow through boiler
Soft Lockout Codes Displayed
(continued)