WHEN FRYER HEATS UP THEN IS LOADED TEMP SEEMS TO FALL AND HAS TO BE RESET

You would be correct in your assessment to check the thermostat.

Hi there.
You may need to calibrate the new thermostat and in doing so, you will need a calibrated thermometer with sensor dipped in oil at about one (1) inch above the fryer thermostat sensing bulb.
Record the cut-off temp (when indicator light goes off) and compare it with the thermostat setting.
The thermostat has a calibration screw ( - ) recessed in the middle of the shaft, you will see the when you pull off the thermostat knob. this calibration screw can be turned by a precision screw driver, turn clockwise to decrease the cut-off temperature ; turn counterclockwise to increase the cut-off temperature.
Just make sure that the unit is preheated or have cycled at least 5 to 8 times and the oil is new before performing the calibration.
Regards.

Replace the thermostat, P5047588. If the fryer is not shutting off, both main burner and pilot, when it overheats, also replace the high limit PP10084. The high limit usually shuts the fryer off at about 425-450F. Check your thermometer. A fryer should never get up to 550F.

Yes it is. If you are trying to get the fryer that hot it is doing it's job as it is not safe to operate the fryer at that temp.

What temp do you want it to run at? If you are trying to go hotter than 550 that is not safe and I do not recommend it.

It probably is a problem with the thermostat. The reset button is probably a high limit. The high limit is a safety device to turn the fryer off if the oil gets too hot. Normally they will "trip" somewhere between 375 - 450 degrees F for commercial fryers. I would suggest placing a temperature probe in the oil and see what the oil temp is when it trips. If it trips at a temp below 375, it is a bad high limit. If the thermostat is set at 350 and the temp goes over 400 then the thermostat is bad.

Hello. It is likely that the thermostat on this fryer is off. try turning it to a higher setting and testing the temp. with a separate theremometer.

You will need someone who is qualified in commercial gas appliance repair to fix this.
Liabilities would render this out of reach for anyone else.

try to change the thermal battery the device that the pilot heats.. other wise there is a screw at the botton of the automatic valve.. try to increase the pilot so it can heat more the thermal battery! u dont have enough voltage to activate the solenoid valve so thats why ur pilot goes off