Burnham Apex APX399 Installation, Operating And Service Instructions page 108

Xii. Troubleshooting
G.
Troubleshooting problems where a Hard Lockout Code is displayed. When a hard lockout occurs, the boiler will shut
down, the display will turn red and the "Help" button will "blink". Select the "blinking" "Help" button to determine the
cause of the Hard Lockout. Once the condition that caused the lockout is corrected, the boiler will need to be manually reset
using the Reset button on the "Active Fault" display or located on the Sage2.1 Control.
Hard Lockout Codes Displayed
Lockout number
4
Supply high limit
5
DHW high limit
6
Stack High limit
12
Flame detected out of sequence
18
Light off rate proving failed
19
Purge rate proving failed
20
Invalid Safety Parameters
21
Invalid Modulation Parameter
22
Safety data verification needed
23
24VAC voltage low/high
24
Fuel Valve Error
25
Hardware Fault
26
Internal Fault
27
Ignition failure
108
(continued)
Condition
Sage2.1 supply sensor detected
temperatures in excess of 210°F.
Sage2.1 DHW sensor detected
temperatures in excess of Setpoint.
Sage2.1 Flue gas (Stack) sensor detected
temperatures in excess of 204°F.
A flame signal was present when there
should be no flame.
Blower is not running at Light-off rate
when it should or blower speed signal not
being detected by Sage2.1.
Blower is not running at Purge rate when
it should or blower speed signal not being
detected by Sage2.1.
Unacceptable Sage2.1 control Safety
related parameter detected.
Unacceptable Sage2.1 control Modulation
related parameter detected.
Safety related parameter change has
been detected and a verification has not
been completed.
Sage2.1 control 24Vac control power is
high or low.
Power detected at fuel valve output when
fuel valve should be off.
Internal control failure.
Internal control failure.
Model APX500 and APX800:
Flame failure after 1 try to restart.
Possible Cause
• Heating load at time of error was far below the minimum firing
rate of the boiler.
• Defective system circulator or no flow in primary loop.
• Defective boiler circulator or no flow in boiler loop.
• Control system miswired so that the boiler operation is
permitted when no zones are calling.
• DHW load at time of error was far below the minimum firing
rate of the boiler.
• Control system miswired so that boiler operation is permitted
when no DHW are calling.
• Heat exchanger needs to be cleaned.
• Boiler over-fired.
• Air-fuel mixture out of adjustment - consult factory.
• Defective gas valve - make sure inlet pressure is below
maximum on rating plate before replacing valve.
• Loose connection in 120 VAC blower wiring.
• Loose or miswired blower speed harness.
• Defective blower
• Loose connection in 120 VAC blower wiring.
• Loose or miswired blower speed harness.
• Defective blower
Safety Parameter verification required. Contact factory.
Reset the control.
Safety related Sage2.1 control parameter has been changed and
verification has not been performed.
• Loose connection in 24Vac VAC power wiring.
• Loose or miswired 24Vac harness.
• Miswired wiring harness causing power supply short to
ground.
• Defective transformer.
• Transformer frequency, voltage and VA do not meet
specifications.
• Loose or defective gas valve harness. Check electrical
connections.
• Defective gas valve (check for 24 Vac at harness during trial
for ignition before replacing valve).
• Reset the control. If problem reoccurs, replace the Sage.
• Reset the control. If problem reoccurs, replace the Sage.
• 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.