SVC 5-2
Oven Temperature Troubleshooting
Problem Probable Cause Corrective Action
1. Oven does not heat.
“WARN: OVEN SHUTOFF”
message appears on dis-
play.
a. Faulty fuse F4 or F5 on
main PCB.
1. Check both fuses.
2. If either fuse is bad, re-
place. If neither fuse is
bad, go to probable cause
b.
b. Oven heater is open.
1. With instrument power off,
check resistance of oven
heater.
2. If it exhibits a dead or near
short, replace the oven
heater element.
3. If heater element is ok, re-
fer to probable cause c.
c. Faulty power supply PCB. 1. Replace power supply
PCB.
2. If problem persists, reinstall
original power supply PCB
and go to probable cause
d.
1. Check both fuses.d. Faulty main PCB PCB.
2. Using the same sample
and conditions on this and
other chromatographs, the
retention times of this GC
differ.
a. Oven needs calibration. 1. Calibrate oven per proce-
dure in this section..
3. Oven does not control. a. Faulty main PCB. 1. Replace main PCB.
4. Oven temperature runs
away.
a. Oven heater partially
grounded.
1. Ensure that the oven heat-
er is not coming in contact
with the oven shell or other
nearby components.
2. If problem persists, go to
probable cause b.
b. Faulty main PCB 1. Replace main PCB.
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