Grindmaster ICB-400 Operation And Instruction Manual page 18

Troubleshooting (cont.)
Problem
Tank does not
heat
Page 18
Heating Problems
Possible Causes
•High electrode coated
with lime or faulty.
•Connection from
control board to tank
body faulty.
•Connections from
control board to heater
relay faulty.
•Line voltage
connections to heater
relay faulty.
•Connections to
remainder of heater
circuit faulty.
•Heater relay faulty.
•Thermal cut-out tripped
or faulty.
Service Check
•Disconnect electrode
wire at quick connect
(red wire). Connect a
wire from the quick
connect to the cabinet
body. If heating begins,
this is the error cause.
•Check to ensure
connection (yellow wire)
is secure.
•Check to ensure
connections (yellow and
orange wires) are
secure.
•Check to ensure
connections (red and
blue wires) are secure.
•Check to ensure
connections from relay
to thermal cut-out and
from thermal cut-out to
contactor and from
contactor to N terminal
of terminal block are
secure.
•Ensure that coil on
heater relay is ener-
gized by ensuring that
there is 12Vac between
the yellow and orange
wires attached to the
relay. Remove the blue
and red wires from the
relay and check for an
open circuit across the
connection tabs (COM
and NC) to which the
wires were attached.
•Check for open circuit
on thermal cut-out.
(NOTE: Tripping of
thermal cut-out can indi-
cate presence of
another problem with
the unit. Unit should be
monitored after resetting
thermal cut-out)
Remedy
•Remove electrode assembly and
clean the probes. If problem is not
corrected, replace electrode assembly.
•Make connection to tank secure.
•Make connections to relay secure.
•Make connections to relay secure.
•Make connections secure.
•If the relay coil is energized and there
is an open circuit across the
connection tabs, replace relay.
•Press rest button on thermal cut-out. if
open circuit condition continues,
replace thermal cut-out.
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