LAARS Heating Systems
Page 86
SECTION 12 Troubleshooting
12.A Lockouts, Holds, and Alerts
The control system on this unit responds to three
kinds of trouble indications:
•
LOCKOUT:
A “lockout” is caused by a serious
problem that might involve a safety issue.
Once the controller enters a lockout, the
burners will shut down, and will not be allowed
to run again until the cause of the problem
is corrected, and the control is manually
reset. The controller will also lockout if you
change a safety-related parameter, and the
unit will require ‘Safety Verification’ before the
control will be allowed to operate. (For more
information on verification, see SECTION 9)
During a lockout condition, the image of the
affected controller on the ‘home’ screen will
appear in red. A bell symbol will appear in the
upper left-hand corner of the control screen.
The system maintains a “history” of the 15 most
recent lockouts.
•
HOLD:
The system may enter a “hold” for a
period of time before locking out. This allows
the controller to see if the error becomes
resolved prior to the hard lockout. Holds may
also show during ignition sequence and normal
operation, as the control moves from one task
to another.
•
ALERT:
An “alert” indicates that some feature
of the control system’s operation was not
correct, delayed or waiting for a response.
This indicates a change in state of the control
system and doesn’t necessarily mean there is
a problem. For example, Alerts occur as the
fan speed transitions from the pre-purge to the
startup. This indicates that the control system
is waiting for a condition to be satisfied. No
Reset is required to recover from an alert. The
system maintains a “history” of the 15 most
recent alerts. Sometimes it can be helpful to
check this list as a troubleshooting aid.
12.A.1 Responding to a Lockout, Hold, or
Alert
1. If a problem occurs while the system is starting
up, the system will declare a Hold. A brief
explanation of the cause of the Hold will appear
in an orange bar across the bottom of the
screen. If you tap the orange bar, the system
will present more information about the Hold.
Correct the cause of the problem, and press the
button on the screen to clear the Hold.
2. If a serious problem continues, the system will
Lockout. A brief explanation of the cause of the
Lockout will appear in an orange bar across the
bottom of the screen. If you tap the orange bar,
the system will present more information about
the Lockout.
Correct the cause of the problem, and press the
Reset button.
3. If an Alert occurs while the system is running,
the system will present a note across the
bottom of the screen. If you tap the orange bar,
the system will present more information about
the Alert. Press the OK button to indicate that
you have seen the Alert.
4. If an audible alarm on the display is active, you
can use the Silence button to stop it.
12.A.2 Viewing the Lockout and Alert
Histories
If your boiler is in a Lockout status, the Home
Screen will be look like Menu 32
1. To view the Lockout/Alert history, start at the
‘home’ screen Menu 32.
Menu 32.
‘Home’ screen (
shown in Lockout
)
2. Touch the Control Icon in the center of the screen
and the Status Summary Screen will appear.
Menu 33.
Status Summary Menu
3. Press the long Yellow Alert or Yellow Lockout Bar
