108
FMS Fault Correction
Leakage Test ( I )
Aids
H7
If after the expiration of the duration, whichis set in P789 (after burner time)
Fault 743
a flame signnal is recognized, these fault shut down occurs.
You may set the monitoring time in P789.
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I1
Despite pre-ventilation, gas pressure is still/again present in the leakage test
Fault 601
line.
Main gas valve 1 (gas line side) leaking
- Check valve
Pressure switch in leakage test line defective or incorrectly set
- Check pressure switch
- Set pressure switch
In the case of venting into the combustion chamber or over-roof:
Main gas valve 2 (burner side) does not open
- Check valve
- Check wiring
- Check fuse on relay module 6 60 R 0016
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I2
No pressure forms in the leakage test line or pressure is not maintained for
Fault 602
long enough.
Main gas valve 2 (burner side) leaking
- Check valve
Main gas valve 1 (gas line side) does not open (or vent valve)
- Check valve
- Check wiring
- Check fuse on relay module 6 60 R 0016
Pressure switch in leakage test line defective
- Check pressure switch
- Set pressure switch
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I3
At the start of the leak test the gas pressure monitor indicated that there is still
Fault 603
gas present in the leakage test line.
Automatic venting is deactivated via parameter 770.
Vent the leakage test line manually.
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I4
Fault 601, 602
Safety Instruction:
In the event of leaks from a gas valve and venting of the leakage test line into
the combustion chamber, repeated resetting of the fault and restarting can
result in a dangerous situation, since small quantities of gas (volume of the
leakage test line) repeatedly flow into the combustion chamber, especially
where pre-ventilation is too short or inadequate (e.g. pre-ventilation
suppression activated).
Do not cancel the fault and reset without rectifying the cause of the fault.
