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6.7.3 Improper Temperature Control
Temperature control is a function of several interrelated components, each of which must operate
correctly. The principle component is the temperature probe. Other components include the
interface board, the water level sensors, the computer, and the ignition module. Whatever the cause,
the symptom is failure of the unit to attain or maintain setpoint temperature.
The unit will not call for heat unless the computer senses that the unit is full of water. Sensing is
accomplished when the water level in the cookpot contacts the upper water level sensor, grounding
it. If the mineral content of the water is unusually low, such as with distilled, purified, or highly
filtered water, the water will not ground the sensor. If this is the cause, adding approximately ⅛-cup
of baking soda to the water will solve the problem.
Similarly, if the upper water level sensor becomes encrusted with lime, starch, or some other build-
up, it will not ground properly. The solution is to clean the water level sensors thoroughly with a
Scotchbrite™ or similar nylon scouring pad.
6.7.4 Computer-Related Problems
The computer used in FBKR18 Series rethermalizers is a specially modified Computer Magic III
computer, part number 806-9396. Standard CM III computers will not operate this equipment
correctly. The first thing to check if problems with the computer are experienced should be the part
number.
Most problems concerning the computer have to do with programming it. There are three common
complaints. The complaints, their causes, and corrective actions are:
1. Fryer constantly displays HI.
Cause: Setpoint incorrect or missing.
Corrective Action: Press 1650, enter the correct setpoint, then press to lock in the
setpoint.
2. Temperature is displayed in Celsius.
Cause: Computer is programmed to display in Celsius.
Corrective Action: Press 1658.
3. Temperature is constantly displayed.
Cause: Computer is programmed for constant temperature display.
Corrective Action: Press i65L.
6.8 Troubleshooting Guides
The troubleshooting guides found in the pages that follow are intended to assist service technicians
in quickly isolating the probable causes of equipment malfunctions by following a logical, step-by-
step process. An additional set of operator troubleshooting guides is contained in Chapter 5. It is
suggested that service technicians thoroughly familiarize themselves with both sets.