Is there 24 VAC to
the ignition
module?
Is there spark to
the igniter and 24
VAC to the gas
valve for 4
seconds?
Yes
Is there gas to the
manifold (the
proper pressure
for the initial stage
is printed no t he
side of the valve.)?
Is there at least
1.5 micro amps
DC to the burner
ground terminal at
the ignition
module?
Replace the
ignition module
Yes
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.
Yes
After replacing the
ground wire to the
burner ground
terminal , is there
1.5 micro amps
DC to the ignition
module?
No
Is there flame at
the burner?
Yes
Yes
No
With
spark and gas there
should be fire.
Recheck the gas
pressure and burners
and
igniter.
Yes
Yes
Replace the
ignition wire
No
Boiler won't heat.
start
PROBLEM
:
Gas boiler
won't ignite
PROBLEM: Gas Boiler Overfills
Boiler over fills
With the HI probe
emersed in water
is there 120 VAC
between terminals
L2 and W F 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
The probe
circuit is open.
Check continuity of the
probe wire and
probe.
No
No
