LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 82)

Page 78 LAARS Heating Systems
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.
53 AC input phases reversed L 1. Check the module and display connections.
2. Check the module power supply and make sure that both frequency
and voltage meet the specifications.
3. On 24 VAC applications, assure that J4 terminal 10 and J8 terminal
2 are connected together.
59 Internal Fault: Mux pin shorted L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
61 Anti short cycle H Will not be a lockout fault. Hold Only.
62 Fan speed not proved H Will not be a lockout fault. Hold Only.
Code Description L or H Procedure