Groen DEE/4-20 A, Operator'S Manual

Page: 10 / 16

10 OM-DEES(T)-40(C,A,C2T™) Domestic
TROUBLESHOOTING
This unit is designed to operate smoothly and efficiently if properly maintained.
However, the following is a list of checks to make in the event of a problem.
Wiring diagrams are found at the end of this manual. When in doubt, turn unit
off and call for service at 888-994-7636. If an item on the check list is marked
with (X), it means that the work should be done by an Authorized Service Agent.
SYMPTOM WHO WHAT TO CHECK
Display not lit
(Advanced & C2T only) User a. That power supply is on.
Authorized
Service Rep
Only
b. Fuses, accessible by removing caps on the side of
the control box.
c. For loose or broken wires. X
d. Temperature controller functioning, by listening
for a click when the switch opens or closes and
verifying LEDs on back of board. X
e. Contactor functioning. X
PROB in display
(Advanced & C2T only) Authorized
Service Rep
Only
a. For loose or broken wires or damaged/failed RTD
probe. X
b. PCB board malfunction/failure
HI in display
(Advanced & C2T only) Authorized
Service Rep
Only
a. For loose or broken wires or damaged/failed RTD
probe. X
b. PCB board malfunction/failure
Kettle is hard to tilt Authorized
Service Rep
Only
a. Gears for foreign materials, and lubrication. X
b. Gears for alignment. X
c. Worn gears or broken gears. X
Kettle will not heat,
and heating indicator
will not come on
User a. Electric power supply to the unit. (Check the circuit
breaker.)
b. Water level in jacket.
Authorized
Service Rep
Only
c. Control circuit fuses. Replace a blown fuse only
with a fuse of the same AMP rating. X
d. For loose or broken wires. X
e. Tilt cut-off switch. X
f. That pressure switch is open. X
g. Operation of temperature control. X
h. Low water cutoff. X
Kettle will not heat,
but heating indicator
comes on
Authorized
Service Rep
Only
a. Temperature control calibration and offsets. X
b. Heater elements with ohmmeter for ground short or
open element. If element is defective, call service. X
Kettle continues
heating after it
reaches the desired
temperature
User a. Control knob setting.
Authorized
Service Rep
Only
b. Temp control circuit for short. X
c. Temp control operation. The contacts should click
when the dial is rotated above and below the
setting for the temperature of the kettle. X
d. Contactor, to determine whether it is energized or
stuck. X
Kettle stops heating
before it reaches the
desired temperature
User a. Control knob setting.
Authorized
Service Rep
Only
b. Temp control calibration and offsets. X
c. Temp control operation. The contacts should click
when the dial is rotated above and below the
setting for the temperature of the kettle. X
Kettle heats slowly User a. For air in the jacket. See “Jacket Vacuum” in the
“Maintenance” section of this manual.
Authorized
Service Rep
Only
b. Heater elements with ohmmeter for ground short
or open element. If an element is defective, call
service. X
c. Voltage of main power source. X
Pressure Relief Valve
pops
User a. For air in the jacket. See “Jacket Vacuum” in the
“Maintenance” section of this manual.
Authorized
Service Rep
Only
b. Pressure switch setting. X
c. Temp control operation. The contacts should click
when the dial is rotated above and below the
setting for the temperature of the kettle. X
d. Pressure relief valve. If the valve pops at pressures
below 49 PSI, replace it.
e. ontactor, to determine whether it is energized. X
Safety valve leaks a
small
amount of steam when
kettle is operating
User a. For contamination that prevents seating of the valve.
With full pressure in the jacket, pull the leer all the way
briefly to blow the valve clean, then let the lever snap
back to seat the valve
Authorized
Service Rep
Only
b. Safety valve for defects. Replace any defectuve
valve with an identical valve. X
CPER in display (C2T
only) User a. That core probe is plugged into the receptacle.
Authorized
Service Rep
Only
b. For loose or broken wires or damaged/failed RTD probe.
X
c. PCB board malfunction/failure. X