Applies to:

Replacing the High Limit Thermocouples

Troubleshooting

An ohm reading can be taken of the protection probe from the P3 connector pins 7&8 on the rear of the board. The values follow our standard RTD 1000 chart we use for all other Henny Penny RTDs.

The Protection probe can be viewed by entering Info mode and scrolling to Temps. Once in temps, the lower right selection button is blinking. Press, and the protection probe displays rather than the Bot display. The displayed temp should be quite a bit higher than the main temp probe. If 999 displays, it indicates an open probe.

Before pressing the lower right button

<= TEMPS =>

Main Lvl Bot

348° 331° 287°

After pressing the lower right button

<= TEMPS =>

Main Lvl PPrb

348° 331° 462°

Replacing

To avoid electrical shock or property damage, move the power switch to OFF and disconnect power.

The E-1 - “Low Oil In Pot” error code triggers if the protection probe is around 280° F (approximate) hotter than the main temperature probe. If this happens, the heat shuts off for 20 seconds to wait for the heat to dissipate from the element. If the element remains hotter than the temperature probe after this time, the control triggers an E-1 error. This error would trigger in the place of a high limit trip if the fryer is turned on with no oil in the pot as the element would be substantially hotter than the main temp probe and the heat would not dissipate into the oil. Troubleshooting a nuisance E-1, check oil level is at the fill mark, make sure the store is performing a clean out procedure. An E-1 can occur with carbon build up and breading build up just like with nuisance high limit trips.

Lift the carrier, tilt back and lock in to place.
Use a crosshead screwdriver to loosen the heating element spreaders.
Use a crosshead bit to remove the screws from the left-hand (from the front of the unit) side panel.
Remove the side panel and set aside.
Use a 1/2 inch wrench to loosen the compression fitting.
Pull the thermocouple from the fitting.
Lower the control board by performing the removal procedure.
Trace wires to the high limit modules on the sidewall of the control board area.
Remove the wires from high limit module.
Use a 1/2 inch wrench to remove fitting from the vat wall.
Obtain the new thermocouple and fitting.
Apply thread sealant to the fitting and thread into the vat wall. Tighten with a 1/2 inch wrench.
Insert the new thermocouple into the compression fitting.

The protection probe is only mounted to the top heating element. The new bracket makes sure the probe comes directly in contact with the element rather than the slight gap on the current thermocouple design.
Extend probe out from vat wall 4.5 inches and clamp to allow .125 inch of the probe to be exposed.
Use a 1/2 inch wrench to tighten the compression fitting onto the thermocouple.
Position heating element spreader next to clamp.
Use a crosshead screwdriver to tighten the heating element spreader.
Connect the new thermocouple wires to the high limit module.

The RTD plugs into the additional probe connection on the rear of the board. This plugs in to the P3 connector on the display CPU board.
Install the side panel, and then the control board by performing the installation procedure.