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APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
From the Help menu, select the blinking Soft Lockout (Hold) icon to determine the cause of the soft lockout. See
Figure 12-2. The boiler will automatically restart once the condition that caused the lockout is corrected.
C. Soft Lockout (Hold)
Figure 12-2: Example Soft Lockout
The Soft Lockout (Hold) screen will display the hold number, name, condition that caused the hold, possible
causes, and a basic description of corrective actions that may be taken to fix the problem. An in-depth guide to
possible soft lockouts is provided in Table 12-3.
Table 12-3: Soft Lockout (Hold) Codes
Lockout
Number
Condition Possible Cause
1
Anti-Short Cycle
Minimum time between starts has
not been reached. Normal delay
used to avoid excessive cycles.
Faulty contact provided by the EMS system.
2
Boiler Recycling
Limits Open
(LCI OFF)
LCI safety limit input not energized.
Limit Control Input (LCI) is not ON. Refer to Limit String Status screen
for list of limits.
• Auto Reset Ext. Limit device open or jumper not installed
• Low water condition (if using 24V LWCO)
• Flow switch open. Check boiler pump and flow switch wiring.
• Sump pressure switch open. Check for vent or combustion air
pipe blockage.
• Condensate float switch open. Check for condensate drain
blockage.
• Loose or defective limit string wiring
3
Burner Interlock
Open (ILK OFF)
ILK safety limit input not energized.
Lockout input (ILK) is not ON. Refer to Limit String Status screen for
list of limits.
• Man Reset Ext. Limit device open or jumper not installed
• High or low gas pressure switch open or jumper not installed
• Thermal link open
• Burner door thermostat open
• Loose or defective limit string wiring
4
Outlet/Supply
High Limit
Supply temperature exceeds
Preferred Supply High Limit minus
Stepped Modulation Recycle
Offset, default 200°F (93.3°C).
• Heating load much less than boiler minimum firing rate.
• Defective system pump or no flow in primary loop.
• Defective boiler pump, no flow or insufficient flow in boiler loop.
• Control system miswired so that the boiler operation is permitted
when no zones are calling.
6
Stack High Limit
Flue temperature exceeds
Preferred Stack High Limit minus
Stepped Modulation Recycle
Offset, default 194°F (90°C).
• Heat exchanger needs to be cleaned
• Boiler over-fired
• Air-fuel mixture out of adjustment
12 Troubleshooting (continued)
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