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American Metal Ware Hot Water Boiler Page 10
NOTE: The level control board works on the principle that water is conductive and with some pure water installations, an
increased senseitivity may be required in the level control system. Consult factory if this be the case.
If you still need help, call our service department at (800) 568-5715 Ext. 3 or (505) 425-4776 (Monday through Friday,
8 am - 6 pm EST) or an authorized service center in your area. Please have the model number and serial number s ready so that
accurate information may be given.
Prior authorization must be obtained from Grindmaster Corporation’s Technical Services Department for all warranty claims.
E)
F)
Tank fills with water,
but heat does not come
on.
No water in tank, but
heat comes on (heater
damage likely).
PROBLEM
IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued)
POSSIBLE CAUSE SERVICE CHECK REMEDY
1)
2)
3)
4)
5)
1)
2)
3)
Thermostat off.
Thermostat inoperative
or out of calibration.
Power relay or
contactor inoperative.
Low electrode faulty
or covered with lime
scale.
Dual Level Control
faulty.
Thermostat and fill
valve connected to
wrong terminals on
Dual Level Control .
Electrode(s) shorting
to ground.
Dual Level Control
faulty.
Visual.
Jumper across thermostat
terminals causes heat to
come on.
Check for voltage
(120V AC) across coil
terminals.
Jumper from “XL”
terminal to metal
enclosure allows unit
to heat.
Jumper from “XL”
terminal to “C” does not
cause unit to heat.
Visual
Disconnecting wire
(white) from “C” probe
terminal provides low
water heat cutoff and
tank fill.
Heat comes on with no
probe wires (HI, XL, C)
connected.
Make sure knob is turned fully clockwise.
Recalibrate thermostat. If no remedy, or ther-
mostat does not cycle, replace.
If correct voltage, replace coil or entire device.
If not correct voltage, check for loose wires,
improper wiring or other cause.
Clean electrodes. Check wiring. If still no
remedy, replace electrode assembly.
Replace Dual Level Control.
Thermostat (brown wire) must be
connected to “HEAT” and fill valve (black wire)
to “FILL”.
Replace electrode assembly. If no
remedy, check for improper wiring (cut insula-
tion for instance), or electrode tips touching
metal inside tank.
Replace Dual Level Control.