5890 Oven Heating Problems A15307 This document is believed to be accurate and up-to-date. However, Agilent Technologies, Inc. cannot assume responsibility for the use of this material. The information contained herein is intended for use by informed individuals who can and must determine its fitness for their purpose. a15307cover.doc http:// www.chem.agilent.com Page 1 of 21 Oven Temperature Troubleshooting Problem Probable Cause a. Faulty fuse F4 or F5 on 1. Oven does not heat. main PCB. “WARN: OVEN SHUTOFF” message appears on display. b. Oven heater is open. Corrective Action 1. Check both fuses. 2. If either fuse is bad, replace. If neither fuse is bad, go to probable cause b. 1. With instrument power off, check resistance of oven heater. 2. If it exhibits a dead or near short, replace the oven heater element. c. Faulty power supply PCB. d. Faulty main PCB PCB. a. Oven needs calibration. 2. Using the same sample and conditions on this and other chromatographs, the retention times of this GC differ. 3. Oven does not control. a. Faulty main PCB. 4. Oven temperature runs away. a. Oven heater partially grounded. 3. If heater element is ok, refer to probable cause c. 1. Replace power supply PCB. 2. If problem persists, reinstall original power supply PCB and go to probable cause 1. d. Check both fuses. 1. Calibrate oven per procedure in this section.. 1. Replace main PCB. 1. Ensure that the oven heater 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 SVC 5- 2 1. Replace main PCB.