Fisher Scientific 146E, Quick Start Manual, Page: 5 / 6

TROUBLE SHOOTING and REPAIR
Symptom Possible Cause Possible Solution to Condition
Incubator controller isn’t
functioning, no lights etc. Power switch isn’t ON or no power to
unit. Place Power ON/ OFF switch inside chamber to
ON. Check power outlet by plugging a known
good device into it.
Erratic temperature display
readings above or below set
point. Frost buildup. Look for frost inside
chamber around evaporator. Defrost per instructions. If possible operate in
50% Cooling Mode to reduce defrosting cycles.
Temperature uniformity in
chamber above specified limit. Frost buildup or airflow blocked by
samples. Defrost per instruction. If airflow blocked by
sample containers, remove some to allow top to
bottom airflow.
Temperature readings too
high or too low compared to
thermometer. Controller may need calibrated. Refer to CALIBRATION section of this manual
Control goes into power on
reset sequence while
operating. Inadequate line power. Test Line
voltage of outlet to Incubator while unit
is operating. If line voltage is < 106 VAC while unit is running,
then a higher capacity AC line is required.
Compressor not operating
while COOL LED is lit. Compressor stalled and thermal
overloads opens. Test line voltage of
outlet while unit is operating. If line voltage is < 106 VAC while unit is running,
then a higher capacity AC line is required.
Temperature readings go far
below setpoint and trigger
alarm at 15°C. Open heater or heater control relay
SSR1. Unplug unit from power then refer to replacing
HTR1. Check heater with OHM meter, about 29
ohms (97-995E 60 ohms).
Temperature readings go far
above setpoint and triggers
alarm at 40°C or above. Defective cooling relay, compressor or
shorted heater SSR1. Check if
compressor is running, if so touch
evaporator in chamber, it should be
cold. If compressor isn’t running while Cool led is on
then replace K2 relay. If compressor is running
and evaporator isn’t cold then cooling system
needs repair. If evaporator is cold then SSR1
may be shorted.
Controller display works but
heater, compressor and
chamber fan don’t. Safety relay K1 not closing. K1 relay may need replaced.
Display EEE/99.9 & Alarm 1 Open sensor or sensor connection. Check sensor connection at controller. Check
sensor with ohm meter, 100 ohms at 0°C and
110 ohms at 25°C.
Display EEE/99.8 & Alarm 1 Shorted sensor or connection. Check sensor connection at controller.
Display EEE/temp & Alarm 1 Incubator needs defrosted. See erratic temperature display readings.
1. Temp Limit = Temp (+/-3°C or more from setpoint) & (> 40°C or <15°C), safety relay opens.
Replacement Parts
Description
Spare Part Number Description Spare Part Number
TC1 Controller SPN102214 S1 Switch SPN83373
Sensor, RTD SPN88613 HTR1 Heater (115V) SPN102079
SSR1 Relay SPN88616 HTR1 Heater (230V) SPN102080
K1 Safety Relay SPN102260 FAN2 (115V) SPN30580
K2 Comp. Relay SPN102259 FAN2 (230V) SPN39854
T1 Transformer SPN88678 THM1 Thermostat SPN88612
Compressor (97-990E) SPN105501
Technical Assistance:
1-800-926-0505
Customer Service: 1-800-766-7000
Fisher Scientific
2000 Park Lane
Pittsburgh, PA 15275 USA
Instruction Manual
Part # 95525 Rev. J