Laars NEOTHERM NTV, Service Manual

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Service Manual - NeoTherm 500
Reacting to Lockouts
on the Original (White) User Interface
The system responds to three kinds of trouble indications:
• A ”lockout” is caused by a serious problem that might involve a safety issue.
Once the controller enters a lockout, the burner will shut down, and will not
be allowed to run again until the cause of the problem is corrected, and you
reset the control system.
• The system may enter a “hold” for a period of time before locking out. This
allows the controller to see if the error is corrected before it goes to a hard
lockout.
• An “alert” indicates that some feature of the control system’s operation was
not correct, delayed, or waiting for a response. This does not necessarily
indicate a problem.
Here is the procedure used to recover from a Lockout.
• The “Lockout” indication will appear in the lower left-hand corner of the dis-
play, and the lockout code will flash in the center.
• Write down the lockout code, and look it up in the Appendix at the end of
this manual.
• Press the Reset button near the lower left-hand corner of the display. This
will reset the lockout, and the lockout code will disappear. (This is why we
told you to write it down.)
If the problem condition is still present, the unit will lockout again. See Section A
for troubleshooting instructions.
You can also check the last lockout or alert code using the Diagnostic mode of
the display:
Press and hold the Next button until the display shows the flame signal followed
by “µA.” This tells you the display is in the Diagnostic mode.
Press Next again to see the last alert. Press Next one more time to see the last
lockout.
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