Burnham K2WT Residential Installation, Operating And Service Instructions page 144

XIV. Troubleshooting
Soft Lockout Codes Displayed
Lockout
Number
13
• Flame rod shorted to ground
Flame rod
• Condensate Trap plugged or dirty.
shorted to ground
14
Differential Temperature rise between supply and return
Temperature inlet/ is too high.
outlet high
The Control is reading a return sensor
15 temperature higher than the supply sensor
Return temp temperature. Condition must be present for
higher than supply at least 75 seconds for this error code to
appear.
16
Supply water temperature has risen too
Supply temp has
quickly.
risen too quickly
17
Normal waiting for
Normal waiting for blower speed to match
blower speed to
purge and light-off setpoint.
match purge and
light-off setpoint.
27
Undefined Fault
Undefined Fault
28 or 53
Air Proving Switch Air Proving Switch Failed to Close
Failed to Close
54
Air Proving Switch
Air Proving Switch Failed to Open
Failed to Open
144
(continued)
(continued)
Condition
• Shorted or mis-wired flame rode wiring.
• Defective flame rod.
• Plugged or dirty drain line in trap.
• Inadequate boiler water flow. Verify that circulator is operating and that
circulator and piping are sized per Water Piping and Trim Section of this
manual.
• 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.
• Supply or return sensor defective.
• See possible causes for "Hard Lockout 4".
• Inadequate boiler water flow.
• Verify that circulator is operating and that circulator and piping are sized
per Water Piping and Trim Section of this manual.
• Consult Factory.
The air proving switch has failed to close;
• Check switch, check switch connection and wiring.
• Blocked vent, blocked inlet, blocked or disconnected air switch tube,
blocked heat exchanger or burner.
• Something is blocking air/flue gas flow through boiler
The air proving switch has failed closed, check switch is operating properly.
The air proving switch is "Closed" when it should be "Open". The air proving
switch is checked for proper function before the blower is started and the start
sequence is allowed to continue. If the air switch is closed before the blower
is started (when there is no air flow) first a soft lockout is initiated and then
a manual reset hard lockout results. The possible cause of the air proving
switch to be closed or fail to open is as follows:
• The air proving switch is jumpered.
• The air proving switch is defective.
• The blower is running before the start sequence starts the blower. This
can be caused by a loss of communication between the blower and
Control. The blower goes to high speed when there is no communication
between the Control and the blower. Possible cause of loss of
communication is a defective wiring harness, blower or Control.
Possible Cause
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