Siemens LMV5 Series Technical Instructions page 240

Error Diag.
Device Display
Code Code
Fault with devices or wiring connected to the Base Unit (LMV5)
Fan Contactor
29 Any #
Contact is on
Any #
Fan Contactor
00
2A
Contact is off
01
Flue Gas
Recirculation
2B Any #
Pressure Switch
on
Any # Flue Gas
Recirculation
2C 00
Pressure Switch
01 off
Any #
Devices
00 conn. to
2D Valve not open
LMV5
01
Any #
00
Valve or Closed
2E Position Indicator
(CPI) open
01
Gas Pressure has
2F Any # dropped below
minimum Limit
Gas Pressure has
30 Any # exceeded
maximum Limit
Section 7
Meaning for the LMV5x System
FCC signal = on, but should have been off
FCC signal = off, but should have been on
FGR-PS = on, but should have been off
FGR-PS = off, but should have been on
Closed Position Indicator (CPI) = on, but should have been off
CPI via terminal StartRelease_Gas Closed Position Indicator
(CPI) = on, but should have been off
Closed Position Indicator (CPI) = off, but should have been on
CPI via terminal StartRelease_Gas Closed Position Indicator
(CPI) = off, but should have been on
Low gas pressure switch is open
High gas pressure switch is open
Page 32
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Corrective Action
1) If not using FCC, make sure parameter FGR-
PS/FCC is not set to "FCC".
2) If an FCC fault occurs in phase 70, call a Siemens
representative. A spark killer may be necessary.
The error message may be traced back to an open
safety loop / burner flange.
1) Check setpoint on FGR pressure switch. Adjust if
necessary.
2) If a FGR-PS fault occurs in Phase 70, call a siemens
representitve. A spark killer may be necessary.
The error message may be traced back to an open
safety loop / burner flange.
1) Check wiring to the fuel valves. With manual shutoff
valves closed, ensure that the fuel valves are opening
in the proper phase (see sequence diagrams).
2) Ensure CPI (POC) switches are opening when the
valve opens. If this does not happen, check wiring,
adjust switch, or replace fuel valve actuator.
1) Check wiring to the fuel valves. Ensure fuel valves
are wired to the correct terminal (see wiring diagram).
With manual shutoff valves closed, ensure that the fuel
valves are opening in the proper phase (see sequence
diagrams).
2) Check wiring of the CPI (POC) switches. See wiring
diagram.
1) Check gas supply and / or manual shutoff valves.
2) Check setpoint and / or wiring of low gas pressure
switch.
1) Check pressure regulators for ruptured diaphragms.
2) Check setpoint and / or wiring of high gas pressure
switch.
SCC Inc.