Siemens LMV5 Quick Start Manual page 170
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Also See for LMV5:
- Technical instructions (374 pages) ,
- Basic documentation (278 pages) ,
- Manual (39 pages)
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Error
Diag.
Device
Display
code
code
Any #
Below O2 Min
01
Value
O2 Min Values
02
undefined
O2 Setpoints
03
B5
LMV5..
undefined
O2 Delay Time
04
undefined
Actual O2 Value
05
invalid
O2 Value
06
Prepurging
not reached
LMV5 QSG Rev 4
Meaning for the LMV5x system
Fault with Base Unit (LMV5) or Oxygen Sensor (QGO2..)
O2 monitor
O2 value has dropped below O2 min. value
Invalid O2 min. value
Invalid O2 setpoint
Invalid O2 delay time
No valid actual O2 value in operation for >= 3 s
During prepurging, the parameterized air
oxygen content of +-2 % was not reached
Sec 5 Pg 44
Corrective action
1) Check the %O2 between the O2 guard curve and the
O2 setpoint curve. Increase the %O2 "gap" between
these two curves at the load point where the the fault is
occuring.
2) Check for mechanical lash (slop) between actuators
and dampers / valves. Also check dampers for worn
bearings. Change to zero lash flexible couplings if
necessary.
3) If necessary, adjust parameters O2 OffsetGas(oil)
and / or O2CtrlThreshold
Set a point for the O2 min Value curve (or O2 Guard
Curve) for each point set up on the ratio control curve
(12 points on ratio control = 12 points on O2 min Value
curve)
Set a point for the O2 setpoints curve (or O2 Control
Curve) for each point set up on the ratio control curve
(12 points on ratio control = 12 points on O2 setpoints
curve)
The dealy time has not been measured sucessfully at
Point 2 or the highest curve point. See Section 5-1
under O2 trim for possible causes.
1) Check the wiring between the O2 Module and the O2
sensor.
2) Check the power supply to the O2 Module
1) Check the parameter "O2 content air". This %O2
must be reached within +/- 2% during prepurge.
2) Check prepurge time. The time that is set may not be
long enough to completely purge the boiler.
3) Sensor may be dirty. Do Not blow out with compresed
air when hot! Cool, then blow out with low pressure
compressed air.
4) O2 Sensor may have reached the end of its service
life (Check Resistance through AZL) If greater than 140 -
150 ohms, replace sensor.
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