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The burner may not light on the fi rst try. The most likely cause of this problem on a new installation •
is a gas line that has not been completely purged. Other possibilities include inadequate inlet gas
pressure or a boiler that is confi gured for the wrong fuel. If the boiler does not light on the fi rst try, it
will go into a lockout condition. When this happens, the Flame Lockout Lamp (Figure 12.3) will be
illuminated. In addition, Lamps 1 and 3 will fl ash and Lamp 2 will be on continuously. To reset the
boiler, push the Flame Reset Button shown in Figure 12.3 AND rotate the Heating System Knob back
to “0” for a few seconds.
Inspect the fl ame visible through the window. The fl ame should be stable and mostly blue (Fig.12.4). 7)
No yellow tipping should be present; however, intermittent fl ecks of yellow and orange in the fl ame are
normal.
Check the inlet and manifold pressures. To do this, use the following procedure:8)
Remove the inner cover (fi gure 12.5). Note: this is necessary in order to read the manifold pressure a)
accurately because the gas valve regulator is referenced to the burner area.
Lamp 2
Lamp 1
Lamp 3
Heating System Knob
DHW
Thermostat
(Combi Only)
Flame Lockout Lamp
Flame Reset Button
Figure 12.3: Control Panel
Figure 12.4: Main Burner Flame