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Improper Temperature Control
Temperature control—including that for the melt cycle—is a function of several interrelated components,
each of which must operate correctly. The principal component is the thermostat (in units equipped
with thermostat controls) or the temperature probe (in fryers equipped with other types of controllers).
Depending upon the specifi c confi guration of the fryer, it may also include an interface board and
controller. Problems with improper temperature control can be categorized into those issues concerning
melt cycle malfunctions and those concerning a failure to control at setpoint.
Melt Cycle
In fryers equipped with thermostat controls, the melt cycle is controlled with a solid state melt cycle
board and a melt cycle switch on the control panel. In all cases, replace the defective component.
In fryers equipped with other types of controllers, the problem may originate in the controller,
the temperature probe, or a malfunctioning heat relay on the interface board. For problem isolation
techniques, refer to the troubleshooting guides, Troubleshooting the Thermostat and Troubleshooting the
Temperature Probe, in Section 1.7, Troubleshooting.
Failure to Control at Setpoint
In fryers equipped with thermostat controls, the problem will
be in the thermostat. Refer to Section 1.3.5 for instructions on
calibrating the thermostat. Possible causes are that
• the thermostat is out of calibration,
• the knob or fl exible shaft is loose on the thermostat shaft,
• a thermostat wire is disconnected or broken, or
• the thermostat is defective.
Refer to Section 1.3.5 for instructions on calibrating the
thermostat. In fryers equipped with other types of controls, the
problem may originate in the temperature probe or probe circuit,
the interface board, or the controller. Refer to Troubleshooting the Temperature Probe, Section 1.7.4.,
for problem isolation techniques.
Gas Valve Malfunction
Occasionally, a gas valve may malfunction. Use Section 1.7.2, Troubleshooting the Gas Valve, to
determine if the valve has failed.
Computer Malfunction
Before diagnosing problems related to a computer controller, it is important to understand the use and
signifi cance of sensitivity and recovery.
Sensitivity and Recovery
Sensitivity—or “stretch time”—is a programmable feature, patented by Frymaster, which increases or
decreases the cook time countdown based on variation in the oil temperature from the setpoint. The
Up for reverse
Sediment
Particle
Oil Flow
Down for forward
Sediment
Particle
Removing debris or shortening from
a seized pump.