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American Metal Ware Hot Water Boiler Page 8
A)
B)
C)
Overfilling of water
tank when power is
off.
Overfilling of water
tank only when power
to unit is on.
Auto refill fails to
fill water tank.
PROBLEM
IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System
POSSIBLE CAUSE SERVICE CHECK REMEDY
1)
2)
1)
2)
3)
4)
1)
2)
Fill solenoid valve leaking
due to dirt or scale holding
valve open, or worn
plunger seat.
Fill solenoid valve
installed backwards.
High electrode coated
with scale, or faulty.
Missing or faulty
common connection for
electrode circuit (“C”
terminal to metal
enclosure).
Fill valve connected to
“HEAT” terminal.
Dual Level printed
circuit board faulty.
No power at equipment.
No water at equipment.
Visual. Water entering
tank continuously, and
usually slowly.
Visual.
Jumper from “HI” terminal
to metal enclosure stops
fill.
Jumper “C” terminal
(next to XL) to metal
enclosure stops fill.
Visual.
Jumper from “HI” to “C”
does not stop fill.
Nothing operates on
machine.
“Crack” fitting at
water inlet for pressure
check.
Disassemble and clean out. May
require new plunger assembly. Caution
is advised to avoid damage to valve.
See valve instruction sheet.
On valves without integral strainer:
Install so that port marked “IN” is
connected to outside fresh water
supply.
On valves with integral strainer:
Install so that arrow points in
direction of tank, away from fresh
water supply.
Remove electrode assembly. Clean both
electrodes. If still no remedy and
connections are good, replace assembly.
Make good secure connection. May
require cleaning or replacement.
Connect “BLACK” wire lead to “FILL”
terminal.
Replace Dual Level Control.
Make sure main switch(es), fuse(s),
circuit breaker(s) provide power to
unit, that machine’s circuit
breaker is OK and power switch, if
provided, is on.
Make sure all water supply line
valves are open.