Shellab SRI21D-2 - Manual (Page 16)

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1/ ±0.1 may be normal
2/ is fan working?
– fan must operate for uniformity
3/ is ambient room temperature radically changing – either door
opening or room airflow from heaters or air conditioning ? –
stabilize ambient conditions.
4/ sensor miss-located, damaged or wires may be damaged -
check mounts for control and Thermostat sensors, then trace wires
or tubing between sensors and controls.
5/ calibration sensitivity
– call Customer Service
6/ Overtemperature set too low – be sure that Thermostat is more
than 5 degrees over desired set point; check if OVERTEMP pilot is
on continuously; turn controller knob completely clockwise to see if
problem solved then follow instructions in owner’s manual for
correct setting
– see section 5.8
7/ electrical noise – remove nearby sources of RFI including
motors, arcing relays or radio transmitters.
8/ bad connection on temperature sensor or faulty sensor
– check
connectors for continuity and mechanical soundness while
watching display for erratic behavior; check sensor and wiring for
mechanical damage.
9/ bad connections or faulty relay
– check connectors for
mechanical soundness and look for corrosion around terminals or
signs of arcing or other visible deterioration.
Display and reference thermometer
don’t match
1/ calibration error – see section 5.9
2/ controller failure – evaluate if pilot light is operating correctly
3/ allow at least two hours to stabilize.
4/ see if reference thermometer is certified.
Calibrated at one temperature, but
not at another
Refer to Section 5.9
REFRIGERATION
Temperature can't get up to set point
1/ assure that power is going to heating coils.
2/ confirm that evaporator is calling for heat (check front panel
light).
3/ if light not coming on, check control set point and Thermostat
set point .
4/ confirm that fan is operating and airflow is not blocked.
5/ reset by turning unit off and on.
Unit won't cool