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3 System Operation
I1
Fault 601
Despite pre-ventilation, gas pressure is still/again present in the leakage test 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 fuse
- Check wiring
- Check valve
I2
Fault 602
No pressure forms in the leakage test line or pressure is not maintained for 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
Pressure switch in leakage test line defective
- Check pressure switch
- Set pressure switch
I3
Fault 603
At the start of the leakage test the gas pressure monitor indicates that gas is still present in
the leakage test line.
Automatic venting is deactivated via parameter 770
Vent the leakage test line manually.
I4
Fault 601, 602
WARNING!
In the event of leaks from a gas valve and venting of the leakage test line into the com-
bustion chamber, repeated resetting of the fault and restarting can result in a danger-
ous 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 in-
adequate (e.g. pre-ventilation suppression activated).
Do not cancel the fault and reset without rectifying the cause of the fault !
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