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G. Troubleshooting problems where a Hard Lockout Code is displayed.
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 Control.
Hard Lockout Codes Displayed
Lockout Number
4
Supply 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
Undefined Fault
54
Air Proving Switch
Failed to Open
107774-01- 9/17
XV. Troubleshooting
Condition
Control supply sensor detected
temperatures in excess of 210°F.
Control Flue gas (Stack) sensor
detected temperatures in excess of
214°F (101°C).
A flame signal was present when there
should be no flame.
•
Condensate trap plugged.
Blower is not running at Light-off rate
when it should or blower speed signal
not being detected by Control.
Blower is not running at Purge rate
when it should or blower speed signal
not being detected by Control.
Unacceptable Control Safety related
parameter detected.
Unacceptable Control Modulation
related parameter detected.
Safety related parameter change has
been detected and a verification has
not been completed.
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.
Undefined Fault
Air Proving Switch Failed to Open
(continued)
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, no flow or insufficient flow in boiler loop.
•
Control system miswired so that the boiler operation is
permitted when no zones 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.
•
Plugged drain line in trap.
•
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 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.
•
Reset the control. If problem reoccurs, replace the Control.
•
Reset the control. If problem reoccurs, replace the Control.
•
Reset the control. If problem reoccurs, replace the Control.
•
Reset the Control. If problem reoccurs, replace the Control.
See Soft Lockout 54.
When a hard lockout occurs, the
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