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T
ROUBLESHOOTING
One Shelf Not Heating
Repair or replace the
wiring to terminal blocks
L1 to L2/N.
38
Measure the voltage at
the L1 and L2/N terminals
of the temperature
controller.
Does the measured
voltage correspond to the
voltage printed on the
serial number tag?
No
Measure the voltage at
terminal blocks
L1 to L2/N.
Does the voltage
No
correspond to the voltage
printed on the serial
number tag?
Turn the temperature
control for the shelf that is
not heating to the highest
number.
Yes
Is the green indicator
No
light illuminated for the
shelf that is not heating?
Yes
Remove electrical power
from the unit. Measure
the resistance value of the
heating pad.
Does the heating pad
have the correct
resistance value?
Measure the resistance
Yes
value of the RTD
temperature sensor for
the shelf that is not
heating.
Does the temperature
sensor have the correct
resistance value?
Heated S h el f M erch an di s er
S e r v ice Man u a l
?
No
Replace the heating pad.
Repair the wire
Yes
connections at the
terminal block.
Replace the RTD
No
temperature sensor.
The temperature
controller has failed.
Yes
Replace the temperature
controller.
MN-390 54
R ev 1
?
?
?
4 /17
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