Page 16 American Metal Ware 87710E Coffee Urn
Problem Possible Cause Service Check Remedy
Make sure knob is turned fully
clockwise.
Recalibrate thermostat. If no reme-
dy, or thermostat 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 insulation for instance), or elec-
trode tips touching metal inside tank.
Replace Dual Level Control.
Visual.
Jumper across thermo-
stat terminals causes
heat to come on.
Check for voltage
(120V AC) across coil
terminals.
Jumper from “XL” termi-
nal to metal enclosure
allows unit to heat.
Jumper from “XL” termi-
nal 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
1) Thermostat off.
2) Thermostat inopera-
tive or out of calibration.
3) Power relay or con-
tactor inoperative.
4) Low electrode faulty
or covered with lime
scale.
5) Dual Level Control
faulty.
1) Thermostat and fill
valve connected to
wrong terminals on
Dual Level Control.
2) Electrode(s) shorting
to ground.
3) Dual Level Control
faulty.
E) Tank fills with water,
but heat does not come
on.
F) No water in tank, but
heat comes on (heater
damage likely).
NOTE: The level control board works on the principle that water is conductive and with some pure water installations an increased sensitivity 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 (502) 425-4776 (Monday through Friday, 8 am - 6 pm EST) or an authorized
service center in your area. Please have the model and serial number ready so that accurate information may be given.
Prior authorization must be obtained from Grindmaster Corporation’s Technical Service Department for all warranty claims.
IV) Trouble Shooting Auto Refill, Low Water Cutoff, and DualLevel Control System (continued)