Laars NEOTHERM NTH Series, Installation And Operation Instructions Manual

Page: 75 / 84

Page 75
N
EO
T
HERM
Residential Boilers
®
17 Internal fault:
Safety relay test failed due to safety relay
not OFF
L
Internal fault
1. Reset module
2. If fault repeats, replace module.
18 Internal fault:
Safety relay test failed due to feedback
not ON
L
19 Internal fault:
Safety RAM write
L
20 Internal fault:
Internal fault: Flame ripple and overflow
H
21 Internal fault:
Flame number of sample mismatch
H
22 Internal fault:
Flame bias out of range
H
23 Internal fault:
Bias changed since heating cycle starts
H
24 Internal fault:
Spark voltage stuck low or high
H
25 Internal fault:
Spark voltage changed too much during
flame sensing time
H
26 Internal fault:
Static flame ripple
H
27 Internal fault:
Flame rod shorted to ground detected
H
28 Internal fault:
A/D linearity test fails
H
29 Internal fault:
Flame bias cannot be set in range
H
30 Internal fault:
Flame bias shorted to adjacent pin
H
31 Internal fault:
SLO electronics unknown error
H
32-46 Internal fault:
Safety Key 0 through 14
L
47 Flame Rod to ground leakage H
48
Static flame (not flickering)
H
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.
Internal sub-system fault.
51 Pump fault H
52 Motor tachometer fault H