Installation-Operation-Maintenance
GZ 2 - GZ 4 / 100 - 1450 kW
14
Fault diagnosis TMG 740-3 and TMG 740-2
Fault
Remedy
Burner does not start,
program display re-
mains the same
•
Faulty electric lead
•
Thermostat or gas switch
"OFF""
Burner does not start,
program display turns
constantly
•
Air pressure switch defect or not
in idle position (working contact
must be open)
Automatic unit shows a
fault just after starting
pre-venting (line in
blue box)
•
Air pressure switch contact does
not close
•
Flame signal
Automatic unit shows a
fault during pre-
venting (blue area)
•
Air pressure switch contact
opens
•
Flame signal
Automatic unit shows a
fault during the safety
period (yellow area)
•
No flame formed (faulty ignition,
valve does not open, etc.)
•
No or weak flame signal (flame
does not hold, poor insulation of
flame sensor, burner not cor-
rectly connected to earth con-
ductor)
Automatic unit shows a
fault during operation
setting (red or green
area)
•
Flame breaks off
•
Air pressure switch contact o-
pens
•
Flame signal too weak
