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Error Cause Corrective Action
F114
Runaway lower temperature
(>950°F)
a) Intermittent or bad
temperature sensor.
b) Heating element relay stuck
on.
1. Check P24 connector on the Power Board.
2. Unplug the sensor connector and check lower sensor resistance
(approximately 1080 ohms at room temperature with connector
removed).
3. If sensor is OK, replace Power Board.
4. Check wiring to heating element. If OK, replace Power Board.
F121
Stuck keyboard key.
Bad display head or bad
keyboard.
1. Check all connections between the display head (P5) and the
keyboard (J1).
2. Make sure that there are no objects in close proximity to the front
and back sides of the keypads.
3. Replace Display Board or keyboard or both.
F123
Keyboard disconnected
Bad connection between
keyboard and Display Board.
1. Check all connections between keyboard (J1) and Display Board
(P5).
2. If OK, replace keyboard or Display Board or both.
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