Laars NTH1000, Installation And Operation Instructions Manual, Page: 104 / 140

LAARS Heating Systems Page 100
Code Description L or
H
Procedure
26 Internal fault:
Static flame ripple
H Internal fault
1. Reset module
2. If fault repeats, replace module.
27 Internal fault:
Flame rod shorted to ground detected H Internal fault
1. Reset module
2. If fault repeats, replace module.
28 Internal fault:
A/D linearity test fails H Internal fault
1. Reset module
2. If fault repeats, replace module.
29 Internal fault:
Flame bias cannot be set in range H Internal fault
1. Reset module
2. If fault repeats, replace module.
30 Internal fault:
Flame bias shorted to adjacent pin H Internal fault
1. Reset module
2. If fault repeats, replace module.
31 Internal fault:
SLO electronics unknown error H Internal fault
1. Reset module
2. If fault repeats, replace module.
32-46 Internal fault:
Safety Key 0 through 14
L Internal fault
1. Reset module
2. If fault repeats, replace module.
47 Flame Rod to ground leakage H Internal fault
1. Reset module
2. If fault repeats, replace module.
48 Static flame (not flickering) H Internal fault
1. Reset module
2. If fault repeats, replace module.
49 24 VAC voltage low/high H 1. Check the module and display connections.
2. Check the module power supply and make
sure that frequency, voltage and VA meet the
specifications.
50 Modulation fault H Internal sub-system fault.
1. Review alert messages for possible trends.
2. Correct possible problems.
51 Pump fault H Internal sub-system fault.
1. Review alert messages for possible trends.
2. Correct possible problems.
52 Motor tachometer fault H Internal sub-system fault.
1. Review alert messages for possible trends.
2. Correct possible problems.