Forma Scientific 3546 - Section 6 - Service; 6.1 General Troubleshooting

Forma Scientific, Inc._____________________________________________Service
6-1
Section 6 - Service
6.1 General Troubleshooting
Symptom Possible Cause
Problem 1: Pilot lights not on. Readouts
are dark. CO
2
power switch is on.
• Unit unplugged, or main power switch not on.
• Circuit breaker tripped.
• Outlet overload protection has tripped.
• No voltage at outlet.
• Defective incubator wiring.
Problem 2: Pilot lights on but heat light
and alarm monitor module lights out.
• 0.3 Amp fuse in control panel is blown.
Problem 3: CO
2
system indicator and
readout are dark no control of CO
2
in
chamber. Switch is on.
• Circuit breaker tripped.
• Defective switch or wiring.
• Defective CO
2
module.
Problem 4: CO
2
setpoint and display
agree. FYRITE reads lower.
• FYRITE not zeroed.
• Wool filter in FYRITE is dry.
• FYRITE fluid need to be changed.
• Chamber absolute humidity has decreased.
• Control is incorrectly zeroed.
• Defective CO
2
sensor or control.
Problem 5: Alarm sounds periodically,
even with the alarm disabled. CO
2
alarm
light not activated.
• Over temp control set too low.
• Shorted heater.
• Defective temp control or sensor.
Problem 6: CO
2
alarm and light are on.
Alarm can be reset or disabled. If reset,
alarm activates again.
• CO
2
level has deviated more than 1% from
setpoint.
• CO
2
supply has been interrupted.
• CO
2
inject circuit is defective.
• CO
2
solenoid is defective.
• CO
2
sensor fan is defective.