Shellab SRI21FV-2 - Manual (Page 13)

13
TROUBLESHOOTING and SERVICE
When troubleshooting, always make a visual inspection of the incubator and its control console to find
loose or disconnected wires which may be source of the trouble. In the event the incubator does not
operate properly, check the following before calling for service.
TEMPERATURE
Temperature too high
1/ controller set too high-see section 5.5
2/ controller failed on
– call Customer Service
Temperature too low
1/ Overtemperature set too low
2/ controller set too low
3/ unit not recovered from power failure or being turned off
–
incubators will need to warm up and stabilize.
4/ element failure
– see if heating light is on; compare current
draw to data plate.
5/ controller failure
– confirm with front panel lights that controller
is calling for heat.
6/ Overtemperature Thermostat failure
– confirm with front panel
lights that thermostat is operating correctly.
Unit will not heat
1/ verify that controller is asking for heat by looking for heating
light is activated.
2/ do all controller functions work?
3/ is the Thermostat set high enough?
– for diagnostics, should
be fully clockwise with the pilot light never on.
Display and reference thermometer
don’t match
1/ calibration error – see chapter 4 of Watlow Manual- calibration
offset 1
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.
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/ if light not coming on, check control set point and
Overtemperature set point .
2/ confirm that fan is operating and airflow is not blocked.
Section
7