Boiler Control Instruction & Operation Manual, Rev 1
Page
52
of 64
Troubleshooting
Lockouts
Display Faults
When a lockout occurs a notification pops up and the
“History” button turns red. The “History” button will lead you
to the lockout history log, which shows the last 15 lockouts. Touch any lockout on the history page to investigate
further.
Figure 25
: Hard Lockout Example
The Lockout History screen will display the Lockout number, name of the lockout, the time and date of
occurrence, and during what burner cycle it occurred. The details window that appears when a lockout is
selected will display the state of the boiler and all boiler I/O when the lockout occurred.
Below is an in-depth guide to possible lockouts.
Lockout Number
Condition
Possible Cause
67
Burner Interlock Open
(ILK OFF)
The safety limit input is not
energized.
-
Limit(s) are open or a wire is loose.
-
Ground in one of the wires.
79
Supply high limit
Supply sensor detected
temperatures exceeding High
Limit.
-
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.
80
DHW high limit
DHW sensor detected
temperatures in excess of
Setpoint.
-
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.
82
Stack High limit
Flue gas (Stack) sensor
detected temperatures in
excess of 204°F (95.6°C).
-
Heat exchanger needs to be cleaned.
-
Boiler over-fired.
-
Air-fuel mixture out of adjustment - consult
factory.
105
Flame detected out of
sequence
A flame signal was present
when there should be no
flame.
-
Defective gas valve - make sure inlet pressure is
below maximum on rating plate before replacing
valve.