Replace the
on/off rocker
switch
Yes
Connect power
to steamer.
No
Is the red light on
in the power
switch?
Is there power to
the steamer?
Is there water in
the sight glass?
Yes
See
Steamer won't
fill.
No
PROBLEM:
Steam Coil Boiler
won't build
pressure
No
Boiler won't build
pressure
Is the Amber light
on in the reset
switch?
Is there 120 VAC
between
terminals L2 and
HTR on the water
board?
Is there 120 VAC
between terminals
L2 and HTR on the
water board with a
jumper between
Low and C?
Is there 120 VAC
to terminal 6 on
the latching relay?
Repair
or Replace the
probe circuit.
Replace the
water board
Replace the
Reset switch
Yes
After depressing
the reset switch,
does the Amber
light go off?
Does this boiler
have the optional
Secondary Low
Water Cut Out?
With the High
Limit pressure
switch
temporarily
bypassed, does
the Amber light go
off when the reset
switch is
depressed?
Yes
No
No
Yes
No
Replace
the high limit
pressure
switch
With the SLW CO
switch
temporarily
bypassed, does
the Amber light go
off with the reset
switch depressed?
No
Yes
Yes
Replace the
SLWCO switch
With a jumper
from terminal 5 to
9 on the latching
relay, does the
Amber light go out
with the reset
switch depressed?
No
No
Replace the
latching relay.
Yes
Yes
Is there 120 VAC
to the coil of the
steam solenoid?
No
Yes
Replace the
latching relay
No
Yes
Is there 120 VAC
to the coilof the
steam solenoid
with the operating
pressure switch
temporarily
bypassed?
No
Replace the
latching relay
Replace
the operating
pressure
switch
Does the Steam
solenoid open?
Yes
Is there an steam
at the steam coil?
Yes
With
Elements heating
the water, the
Boiler is making
steam. Check for
leaks.
Is there a lot of
steam coming out
the drain?
Replace the
steam trap for
the boiler.
No
Supply steam
to the steamer.
No
Replace the
steam solenoid
No
No
Yes
Yes
Is the steam trap
for Incoming
steam opening to
remove air and
water from coil?
Yes
Yes
Yes
Replace the
steam trap for
the coil
No