BEFORE SERVICING, REFER TO PAGE 3 AND 4 OF THIS DOCUMENT FOR IMPORTANT NOTICES
L22-405 RO 12
COMPONENT TROUBLESHOOTING
Temperature Probe:
To check the temperature probe resistance reading:
1. Turn the appliance o. Disconnect the electrical supply.
2. Open the front panel to gain access to the temperature probe connecon.
3. Disconnect the temperature probe from the computer wire harness.
4. Using a mulmeter that can read up to a minimum of 200K ohm, check the resistance of the temperature probe and
record the reading. If the reading is “O.L.” or “OPEN”, the temperature probe has failed and would need to be
replaced.
5. Check each probe lead to the frame of the appliance. A reading of “O.L.” or “OPEN” should display. Any resistance
reading to the frame would indicate a short to ground and the probe would need to be replaced.
6. Check the current oil temperature inside the tank, approximately one inch above the end of the temperature probe
inside the tank. Record the temperature reading.
7. Using the temperature probe chart on page 19, compare the resistance reading to the temperature of the oil. The
temperature listed on the chart for the resistance should be within 5°F/2.8°C of the actual oil temperature.
8. Reconnect the temperature probe to the controller wire harness and reassemble the front panel.
9. Reconnect the electrical supply. Verify operaon.
Oil Level Probe:
To check the oil level probe:
1. Turn the appliance o. Disconnect the electrical supply.
2. Open the front panel to view the relay board.
3. Locate the oil level probe wire connecon on the relay board. It is located in the upper le of the relay board and is
labeled J502. Unplug the oil level probe.
4. Using a mulmeter set to ohms, check the resistance between the two red wires. An acceptable reading is 150Ω +/- 10%.
5. Now check the resistance between the two black wires. The acceptable reading is 100Ω - 200Ω.
6. Next check each red to each black and check each wire to ground. The acceptable reading is “O.L.” or “OPEN”.
7. Reconnect the oil level probe and reassemble the front panel.
8. Reconnect the electrical supply. Check operaon of the appliance.
To replace the oil level probe:
1. Lower the front panel. Then remove the ve screws securing the component panel to the frame of the unit. Two
screws are in the lower le, two screws are in the lower right and the last screw is at the top center of the panel.
2. Remove the component panel. Make note of wire connecons of any wire you need to remove to complete this.
3. Remove the oil level probe access cover by removing the two screws. One screw is above the fuse block. The other
screw is above the safety (side on) contactor. The oil level probe should now be visible.
4. Unscrew the oil level probe from the tank. Install the new oil level probe in reverse, using food grade thread sealant
on the male threads of the oil level probe.
24VAC Transformer
To check the transformer:
1. Turn the appliance o. Disconnect the electrical supply.
2. Open the front panel and locate the transformer.
3. Note all wire connecons and then disconnect the wires from the transformer.
4. Using a mulmeter set to ohms, check pin 6 to pin 10 for resistance. Acceptable reading is 0.4Ω - 0.6Ω.
5. For 208VAC Units, check pin 2 to pin 5 for resistance. Acceptable reading is 21Ω to 22Ω.
6. For 240VAC Units, check pin 1 to pin 5 for resistance. Acceptable reading is 25Ω to 26Ω.
7. Reconnect the wiring to the transformer. Then reconnect the electrical supply.
8. Verify on the relay board that 24VAC - 28VAC is present at J135 between the blue wire and white wire.
9. Reassemble the front panel and verify operaon of the appliance.
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General