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1.9.2 Replacing the Temperature Probe or High-Limit Thermostat
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil below the level of the probe or thermostat.
3. Lift up on the bezel to disengage the tabs on its lower edge from the control panel frame.
4. Remove the top two screws in the upper corners of the computer.
5. Swing the computer out from the top and allow it to rest on its hinge tabs.
6. Disconnect the computer wiring harness and ground wire from the back of the computer and
remove the computer by lifting it from the hinge slots in the control panel frame.
7. Disconnect the ignition cables from the ignitors by grasping the boots and gently pulling toward
you.
8. Disconnect the flame sensor wires from the flame sensors.
9. Disconnect the sound device lead from the interface board.
10. If working on the left frypot, cut the wire tie on the wiring bundle and disconnect the main wiring
harness 15-pin connector.
11. Remove the component box mounting screws.
12. Rotate the top of the component box out of the frame and carefully pull it out enough to
disconnect the wiring harness plug from the back of the box. This will leave one set of wires,
enclosed in spiral wrap, connected to the component box.
13. Remove the box and set it atop the fryer to expose the temperature probe and high-limit
thermostat.
14. Unscrew the probe or thermostat from the frypot.
15. Apply Loctite
®
PST56765 pipe thread sealant or equivalent to the replacement part threads and
screw the replacement part into the frypot, torquing to 180 inch-pounds.
16. Connect the wires from the new component as follows:
a. If replacing the temperature probe, use a pin pusher to disconnect (one at a time) the red and
white leads from the connector and insert the corresponding leads from the new probe into the
plug..
b. If replacing the high-limit thermostat, use a pin pusher to disconnect the lead running to the
connector and insert the corresponding lead from the new thermostat. Disconnect the other
lead from the drain safety switch and connect the remaining lead from the new thermostat.
17. Reverse steps 1 through 13 to complete the procedure.
1.9.3 Replacing the Interface Board
1. Perform steps 1 through 4 from section 1.9.1.
2. Disconnect the wires attached to the interface board, marking or making a note of the wires and
terminals to facilitate reconnection.
3. Remove the nuts at each corner of the interface board and carefully pull it from the studs far
enough to allow the connector on the back of the board to be disconnected, then remove the board
from the box. When removing the board, be careful not to lose the spacers that fit over the studs
behind the board.
4. Recover the relay(s) from the failed interface board and install on the replacement board.
5. Reverse the procedure to install the replacement board, being sure that the spacers behind the
board are in place.
6. Reverse the steps to reinstall the computer.