GZ 2 - GZ 4 / 100 - 1450 kW
Installation-Operation-Maintenance
15
Troubleshooting
Check general operating status. Are the stated values met?
Störung
Ursache
Behebung
Burner does not work
Check main switch, fuse, boiler thermostat
Check voltage (neutral and live wires)
Check leak detector
Check gas pre-pressure
Check gas pressure detector (setting, function)
Replace firing sequence controller
Burner Starts
Gas pressure and gas shown
No ignition spark
Check ignition transformer, ignition cable and
spark electrode setting
Replace firing sequence controller
Burner works
Gas pressure shown
Spark visible
No flame
Air in the gas pipe
Flame detector could be exposed to another
source of light
Burner works
Gas pressure shown
Spark visible
Flame OK
No ionisation current
(GZ 2 + GZ 4)
No infrared display (GZ 3)
Fault cutout
Check connection of neutral and live wires
Check gas flow pressure (fluctuating pressure
gauge display = gas pipe too small or pressure
controller defect
Set infrared flicker detector (IRD) (GZ 2 + GZ 4)
to 7, check IRD's Position, replace IRD (GZ 3)
Replace firing sequence controller
Burner does not start up,
program display stays the
same
Faulty electric lead
Thermostat or gas pressure switch off
Check electric leads
Replace thermostat or gas pressure switch
Burner does not start up,
program display turns con-
stantly
Air pressure switch defect or not in idle position
(contact must be open)
Replace air pressure switch
Burner starts up, automatic
unit shows fault just after
starting pre-venting
Air pressure switch contact does not close
Check wiring for air pressure switch
Replace air pressure switch
