Other Common Faults - Siemens LME7 Series Technical Instructions

LME Series

Other Common Faults

Loc 10 is a catchall fault that can be caused by a variety of issues. All known causes of Loc 10
are listed below in Table 7-1.
Cause # LME71/73/75
1 All
LME73/75
2
only
3 All
4 All
5 All
6 All
7 All
8 All
Notes:
1. It is likely that the rating on the blower motor output X2-01.3 was exceeded.
Output X2-01.3 has a 2 Amp rating at 120 V, 50/60 Hz.
SCC Inc.
Known Causes of Loc 10
Table 7-1: All Known Causes of Loc 10
Description
Line power is directly connected
to safety loop input X3-04.1
PV jumper missing
Line power directly connected to
blower output terminal X2-01.3
K4 relay contacts welded
Line power directly connected to
POC source terminal X2-02.3
Line power directly connected to
SV output terminal X6-03.3
Ambient temperature exceeds
140°F
Flame failure incorrectly being
logged as Loc 10
Page 7
Technical Instructions
Document No. LME-1000
Phase Corrective Action
Power to the safety loop
OFF must be sourced from
terminal X3-04.2
Add a jumper between
40 terminals X2-09B.7 and
X2-09B.8
Correct feedback/wiring
OFF
error
With no power on the LME7,
check continuity across pins
21 X2-01.3 and X2-02.3. If there
is continuity, replace the
LME7. See Note 1 below.
Correct feedback/wiring
OFF
error
Correct feedback/wiring
OFF
error
Adjust the temperature back
within the controller's
OFF acceptable range. Add
enclosure cooling if
necessary.
Adjust combustion to avoid
44, 50
flame failures during light-off
Section 7