Flame Failure - Error Code 25 Or 26 - Siemens LMV5 Series Technical Instructions
Linkageless burner management system
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Technical Instructions
Document No. LV5‐1000
If either an error code 25 or error code 26 is encountered, a flame failure has occurred. An
error code 25 means that a flame failure occurred during pilot, while an error code 26 means
that a flame failure occurred during operation. To remedy either fault, check the following:
1. Increase the flame failure response time through the following menu path:
Params & Display > BurnerControl > Configuration > ConfigFlameDet > ReacTmeLossFlame
The LMV5 has a base flame failure response time of 0.8 seconds. The setting of parameter
ReacTmeLossFlame adds an additional 0.2 – 3.2 seconds for a maximum of a 4 second
flame failure response time (FFRT).
2. Use a flame source to check if the flame scanner is defective. The flame signal can be
viewed using the following menu path:
Params & Display > BurnerControl > Configuration > ConfigFlameDet > FlameSignal
Parameter FlameSig QRI_B can be used to view the flame signal when using an infrared
scanner (QRI2...) or an ultraviolet scanner (QRA7...). Parameter FlameSig ION can be used
to view the flame signal when using a flame rod. A flame failure occurs below a 20% flame
signal. If the flame signal reads 0% when using a flame source, check the wiring of the
scanner. See Section 2 for wiring assistance. If the wiring is correct, replace the defective
scanner.
3. If an error code 25 occurred, check the wiring of the ignition transformer and pilot valve.
Also, check to make sure any manual shutoff valves are open on the pilot line.
4. If an error code 25 occurred, check the position of the air damper during ignition. This can
be viewed using the following menu path:
Params & Display > RatioControl > Gas Settings > SpecialPositions > IgnitionPos >
IgnitionPosAir
Decrease this position if the pilot flame is being blown out.
5. If an error code 26 occurred, there could be flame signal decay due to glowing refractory
inside the boiler. If this is the case, replace the QRI2... infrared scanner with a QRA7...
ultraviolet scanner.
Section 7
Flame Failure – Error Code 25 or 26
Page 8
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