Grindmaster AMERICAN METAL WARE 87710 - Manual (Page 15)

Page 16 American Metal Ware 87710E Coffee Urn
Problem
Possible Cause
Service Check
Remedy
Make sure knob is turned fully clockwise. Recalibrate thermost
at. If no reme
-
dy
, or thermost
at does not cycle,
replace. If correct volt
age, replace coil or
entire device. If not correct volt
age,
check for loose wires, improper wiring or other cause. Clean electrodes. Check wiring. If still no remedy
, replace electrode
assembly
.
Replace Dual Level Control. Thermost
at (brown wire) must be
connected to “HEA
T” and fill valve
(black wire)
to “FILL”.
Replace electrode assembly
. If no
remedy
, check for improper wiring
(cut insulation for inst
ance), or elec
-
trode tip
s touching met
al inside t
ank.
Replace Dual Level Control.
V
isual.
Jumper across thermo
-
st
at terminals causes
heat to come on. Check for volt
age
(120V
AC) across coil
terminals. Jumper from “XL”
termi
-
nal to met
al enclosure
allows unit to heat. Jumper from “XL”
termi
-
nal to “C”
does not
cause unit to heat V
isual
Disconnecting wire (white) from “C”
probe
terminal provides low water heat cutof
f and
tank fill. Heat comes on with no probe wires (HI, XL, C) connected
1)
Thermost
at of
f.
2)
Thermost
at 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)
Thermost
at 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 t
ank, 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 inst
allations 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 dep
artment 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 obt
ained from Grindmaster Corporation’
s
Technical Service Dep
artment for all warranty claims.
IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued)