Open Safety Loop - Error Code 21 - Siemens LMV5 Series Technical Instructions
Linkageless burner management system
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Technical Instructions
Document No. LV5‐1000
The safety loop is meant only for safety limits such as an auxiliary low water cutout or a high
limit. The safety loop must be complete, and cannot be reconfigured. The wiring of the safety
loop is shown below:
If an error code 21 is encountered, check the following:
1. The burner flange switch wired between terminals X3‐03.1 and X3‐03.2. There should be
120 VAC on terminal X3‐03.1 at all times. If a burner flange switch is not present, a jumper
must be placed between terminals X3‐03.1 and X3‐03.2.
2. Operating switches in the safety loop. Operating (cycling) switches should not be wired
into the safety loop. If a cycling switch is placed in this loop and it cycles off, the LMV5 will
lockout. The cycling switch should be relocated in series with the burner on / off switch
wired to X5‐03.1:
If the LMV5 is in any external load controller mode (ExtLC...), this is used to cycle the
burner on and off.
If the LMV5 is in any internal load controller mode (IntLC...), then a cycling switch
may not be necessary, since this is done automatically in the LMV5 using parameters
SD_ModOn and SD_ModOff.
3. The safety loop between terminals X3‐04.1 and X3‐04.2. There should be 120 VAC on
terminal X3‐04.1 at all times. If there is not, then one or more of the devices wired into the
safety loop are open. Check each device wired into the safety loop to find which one is
open.
Section 7
Open Safety Loop – Error Code 21
Page 10
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