Laars NTH, Installation And Operation Instructions Manual

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Page 68
LAARS Heating Systems
11.2 Troubleshooting Table
This table includes a listing of the fault codes that may be displayed. Some of these can be corrected by
changing a parameter, while other conditions are more complicated, and will require a service technician.
The fi rst column lists the code number that will appear at the beginning of the Lockout or Hold message in
the orange bar at the bottom of the screen. The second column lists the text as it will appear on the Touch
Screen. The third column shows whether the condition will cause a Hold, or Lockout, or both. The fourth
column lists some suggestions for corrective action.
Code Description Lockout
or Hold Procedure
1
Unconfi gured safety data
L
1. New device, complete device confi guration and
safety verifi cation.
2. If fault repeats, replace module
2 Waiting for safety
data verifi cation
L
1. Device in Confi guration mode and safety
parameters need verifi cation and a device needs
reset to complete verifi cation.
2. Confi guration ended without verifi cation, re enter
confi guration, verify safety parameters and reset
device to complete verifi cation.
3. If fault repeats, replace module.
3 Internal fault:
Hardware fault
H
Internal fault
1. Reset module
2. If fault repeats, replace module.
4 Internal fault:
Safety Relay key feedback error
H
5 Internal fault:
Unstable power (DC DC) output
H
6 Internal fault:
Invalid processor clock
H
7 Internal fault:
Safety relay drive error
H
8 Internal fault:
Zero crossing not detected
H
9
Internal fault:
Flame bias out of range
H
10 Internal fault:
Invalid burner control state
L
11 Internal fault:
Invalid burner control state fl ag
L
12 Internal fault:
Safety relay drive cap short
H
13 Internal fault:
PII (Pre-Ignition Interlock) shorted
to ILK (Interlock)
H or L
15 Internal fault:
Safety relay test failed due to
feedback ON
L