Applies to:
Troubleshooting an E-5 Error Oil Too Hot
Required partsTemperature probe
For replacement parts refer to LVE 300 Series.
Overview
The E-5 error occurs when the PMU/GMU PCB detects that the oil in the vat has reached temperatures at or above 400° F (204°C) via the vat temperature probe.
Call Avoidance
 | To avoid personal injury, always wear PPE when cleaning vat and follow instructions on the cleaning solution. |
Always wear chemical splash goggles or face shield and protective rubber gloves when cleaning the vat as the cleaning solution is high in alkaline. Avoid splashing or other contact of the solution with your eyes or skins. If solution comes in contact with your eyes rinse thoroughly with cool water and see a physician immediately.
 | Excess force will damage the temperature probe. |
Ensure that the probe is clean and clear of crumb debris and also black carbon build up.
If black carbon build up is present, do a clean out with degreaser and focus attention when scrubbing and cleaning on this area to remove carbon build up.
Field Troubleshooting
Checking the Oil Temperature
Check the temperature of the temperature probe using the control by:
Tapping the .
Tapping Information.
Tapping Heat System.
Compare the temperature on the screen to a known calibrated thermometer and insert into the oil to check.
If the thermometer measures a different temperature than the control, check the resistance of the temperature probe.
Checking Resistance on Temperature Probe Connector
| To avoid electrical shock or property damage, disconnect power before installing or servicing equipment. A qualified technician must perform the service procedures. |
Remove the front access panel by removing the cross-tip mounting screws at the lower portion.
Using a 3/8’’ nut-driver, remove the 2- 3/8’’ nuts under the PMU mounting plates. The PMU mounting plate can then be tilted forward to gain access.
Check the resistance (ohms) on the temp probe connector with a multimeter by doing one of the following:
Unplugging the 6 pin white connector checking the resistance.
Unplugging the 2 wire connector with the red wires and checking the resistance.
Compare your resistance to the resistance chart. If it is out of spec by more than 5 degrees Fahrenheit, then replace the temperature probe.
RTD Resistance Chart| Temperature (Fahrenheit) | Temperature (Celsius) | Resistance Ohms |
|---|---|---|
| 50 | 10,00 | 1 039,02 |
| 60 | 15,56 | 1 060,65 |
| 70 | 21,11 | 1 082,24 |
| 80 | 26,67 | 1 103,80 |
| 90 | 32,22 | 1 125,32 |
| 100 | 37,78 | 1 146,81 |
| 110 | 43,33 | 1 168,26 |
| 120 | 48,89 | 1 189,67 |
| 130 | 54,44 | 1 211,05 |
| 140 | 60,00 | 1 232,39 |
150 | 65,56 | 1 253,70 |
| 160 | 71,11 | 1 274,97 |
| 170 | 76,67 | 1 296,20 |
| 180 | 82,22 | 1 317,40 |
| 185 | 85,00 | 1 327,99 |
| 190 | 87,78 | 1 338,57 |
200 | 93,33 | 1 359,69 |
| 210 | 98,89 | 1 380,79 |
| 212 | 100,00 | 1 385,00 |
| 220 | 104,44 | 1 401,84 |
230 | 110,00 | 1 422,86 |
| 240 | 115,56 | 1 443,85 |
| 250 | 121,11 | 1 464,79 |
| 260 | 126,67 | 1 485,71 |
| 270 | 132,22 | 1 506,58 |
280 | 137,78 | 1 527,43 |
| 290 | 143,33 | 1 548,23 |
| 300 | 148,89 | 1 569,00 |
| 310 | 154,44 | 1 589,73 |
| 320 | 160,00 | 1 610,43 |
325 | 162,78 | 1 620,77 |
| 330 | 165,56 | 1 631,09 |
| 340 | 171,11 | 1 651,72 |
| 350 | 176,67 | 1 672,31 |
| 360 | 182,22 | 1 692,86 |
365 | 185,00 | 1 703,13 |
370 | 187,78 | 1 713,38 |
| 380 | 193,33 | 1 733,87 |
| 390 | 198,89 | 1 754,31 |
| 400 | 204,44 | 1 774,72 |
| 410 | 210,00 | 1 795,10 |
420 | 215,56 | 1 815,44 |
| 430 | 211,11 | 1 835,74 |
| 440 | 226,67 | 1 856,01 |
Additional Troubleshooting
Ensure the wires for the probe are in good condition and do not show any signs of failure.
