Is there 24 VAC to
the ignition
module?
Is there spark to
the igniter and 24
VAC to the pilot
coil of the gas
valve for 90
seconds?
Yes
Is there gas to the
pilot assy?
Is there at least
1.0 micro amp DC
to the burner
ground terminal at
the ignition
module?
Replace the
ignition module
See
Boiler
won't build
pressure
.
No
Replace the
ignition module
No
Is there gas to the
unit?
No
Supply gas to
the Steamer.
No
Replace the
gas valve.
After replacing the
ground wire to the
burner ground
terminal , is there
1.0 micro amp DC
to the ignition
module?
No
Is there flame at
the pilot assy?
Yes
Yes
No
Replace pilot
assy and ignition
wire
Yes
Yes
Replace the
pilot assy and
ignition wire
No
Boiler won't heat.
start
PROBLEM
:
24CGP10
Gas boiler
won't ignite
PROBLEM: 24CGP10 Gas Boiler Overfills
Boiler over fills
With water in the
sight glass is there
120 VAC between
terminals L2 and
WF on the water
board.?
Replace the fill
solenoid
With a jumper
across terminals
HI and C on the
waterboard, is
there 120 VAC
between L2 and
WF?
Yes
Replace ;the
water board
Yes
Replace the float
switch.
No
No
Yes
Is there 24 VAC to
the main valve coil
on gas valve?
Yes
No
Replace the
gas valve
Yes