Electrolux CEI30EF5GS Service Manual - Page 28

MEAT PROBE FEATURE Theory Of Operation Some models feature a meat probe that is used to monitor the internal temperature of the food during cooking. The meat probe is a RTD (Resistance Temperature Device) similar to the oven temperature sensor found in ranges with electronic oven controls. As the temperature of the meat probe increases the resistance decreases. The E O C monitors this resistance whenever the probe is inserted into the receptacle and uses this information to determine when the food has reached the target temperature. Component Parts The components of the meat probe feature are: Probe assembly (Fig 1 ) and the receptacle assembly which includes the wire harness (Fig 2 ). Fig 1 Fig 2 Troubleshooting Possible failures of the meat probe feature are: • Loose wire or harness connection. • Defective meat probe. • Defective receptacle and wiring harness. • Defective Electronic Oven Control. To troubleshoot the meat probe feature first test the probe itself by using an ohm meter to measure resistance. Place one of the meter leads on the very tip of the probe plug and the other lead on the adjacent short segment as indicated in the photo. The resistance will vary depending on the actual temperature of the probe. At a room temperature of 77 degrees the resistance will measure approximately 46,000 ohms. Probe Resistance Test Points To test the accuracy of the probe place the metal wand end into a container of water that has a temperature of 120 degrees Fahrenheit and measure the resistance. At 120 degrees the resistance should be between 17,860 ohms and 19,740 ohms. If the resistance is incorrect replace the probe. If the probe resistance is correct plug the probe into the receptacle inside the oven and disconnect the probe harness connector from the E O C connection P 18. Measure the resistance between the two wires in the harness plug. If the resistance is approximately equal to the resistance of the probe then the harness and receptacle circuit are good. Probe Harness Connector P 18 If the resistance is significantly higher or lower than that of the probe then the receptacle and wiring harness should be replaced. The receptacle and wiring harness are replaced as an assembly. If the probe, receptacle and harness are good but the probe feature does not work the failure is in the E O C and it must be replaced. Page 28