13
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.
Will not maintain set point
1/ ASSURE THAT SET POINT IS AT LEAST 5
DEGREES OVER AMBIENT -
2/ see if ambient is fluctuating
Display and reference
thermometer don’t match
1/ calibration error – see section 4.5
2/ temperature sensor failure – evaluate if pilot light
is operating correctly.
3/ controller failure – evaluate if pilot light is
operating correctly
4/ allow at least two hours to stabilize.
5/ see if reference thermometer is certified.
Can't adjust set points or
calibration
1/ turn entire unit off and on to reset.
2/ if repeatedly happens, call Customer Service
Calibrated at one temperature,
but not at another
This can be a normal condition when operating
temperature varies widely. For maximum accuracy,
calibration should be done as close to the set point
temperature.
REFRIGERATION
Temperature can't get up to set
point
1/ assure that power is going to heating coils.
2/ if the displacement is erratic, see if air is being
circulated.
3/ confirm that controller is calling for heat (check
front panel light).
4/ if light not coming on, check control set point and
Safety set point .
5/ confirm that fan is operating and airflow is not
blocked.
6/ reset by turning unit off and on.
Unit will not cool
If the compressor is running:
1/ see if condenser is cold but free of ice.
2/ be sure that fans are circulating air: in the
chamber, and over the compressor.
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