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23 Troubleshooting and Problem Isolation
24 Component Troubleshooting
The following sections provide troubleshooting information for the fryer components.
24.1 Probe
The resistance of the probe changes as the temperature changes. The resistance decreases as the
temperature rises.
The lower the temperature, the greater the resistance change is per degree of temperature change.
As the temperature approaches the working range of the probe, the resistance change becomes
more linear.
Is the probe bad?
Neither probe wire should have any connection to the appliance frame. Typical resistance
reading would be >4 Meg ohms.
Probe wires should not be shorted, less than 100 ohms reading.
Prove wires should not be open circuit, greater than 350K ohms reading.
If the probe is suspect, check it's resistance at the current vat temperature. Measure the temperature
with a thermometer as close to the probe tip as possible. Refer to Probe Resistance Chart on page 94.
Within the cooking range of 325 to 375°F, the resistance should be within 30 ohms of the values in
Probe Resistance Chart for the temperature measured. At lower temperatures (< 325°F), expect larger
variances as the probe response becomes increasingly non-linear.
Offset Adjustments
Static temperature offsets between the probe tip and center oil cooking temperature can be
zeroed out with the cooking control's offset setting. This adjustment forces the heating system to
compensate for the difference between the probe tip temperature and center oil temperature. The
displayed temperature is then the center oil temperature. Refer to the cooking control manual
"Offset Temperature Display" for details on making this adjustment.
Allow the oil to cool and check the probe resistance at a lower temperature. Looking at the probe
resistance chart, a greater resistance variation is tolerated at a lower temperature.
24.2 HD Contactor
The HD contactor has a 24 VAC coil and energizes when the correct voltage is supplied to the coil.
When energized, the contacts close, allowing current to flow through the elements. The coil resistance
is 3.3 Ω +/- 1.
24.3 Side On Safety Contactor
Check the coil with an Ω meter. The resistance should be approximately 5.5 Ω to 7 Ω out of circuit. If it
does not have this resistance, it should be changed.
24.4 Context Removed
L22-393 R0 Page 75
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Table of Contents
Troubleshooting
