PROBLEM: Steam Coil 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?
Replace ;the
water board
Yes
The probe
circuit is open.
Check continuity of the
probe wire and
probe.
No
No
With the wire
removed from
terminal 1on the 3
minute timer, is
there 120 VAC to
the fill solenoid?
Yes
Yes
Replace 3
minute timer
No