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ERC Failure Codes
The oven may stop operating but not give an
F-code on the display immediately. F-codes are
stored in nonvolatile EEPROM. After 2 identical
faults occur consecutively, most F-codes will be
displayed (some are never displayed). If displayed,
Models JKP28, JTP28, JKS06, JCKS06, JKP20, JCKP20, and JTP20
FAILURE
MEANING
CODE
F0
Shorted OFF key
F2
Oven temperature
inside oven cavity as
measured by sensor
over 650°F unlatched
or 915°F latched
F3
Open oven sensor
(over 3000 ohms)
Shorted oven sensor
F4
(under 950 ohms)
Sensor Circuit supervisor
F5
failure
Shorted matrix or START
F7
key
F8
EEPROM data shift failure
Cooling fan stall or other
F9
cause of open thermal
switches in yellow or blue
latch leads
they can be recalled by pressing together:
1. TIMER, 2. CLOCK, and 3. MIN DOWN (or 9).
While displayed, pressing MIN UP or 8 and HR
DOWN or 6 together will clear them. A fault must
exist continuously for 5 minutes before an F-code
is recorded (F2, F8 are sooner).
CORRECTION
Determine if problem is with Key Panel or Control by
disconnecting ribbon cable and measuring flat cable
3 to 4. Should be to probe side with conductor.
Should be 125–1750 ohms while pressing OFF key.
• Welded relay contacts
• Airflow to rear of unit
• High resistance in oven sensor leads/connectors
(especially at sensor in rear)
• Disconnect power. Disconnect sensor harness
from control. Measure sensor resistance (white
leads) to be ~1080 ohms at room temperature with
2 ohms per deg change.
• Look for damaged harness terminals if not a bad
sensor.
• Disconnect power. Disconnect sensor harness
from control. Measure sensor resistance (white
leads) to be ~1080 ohms at room temperature with
2 ohms per deg change.
• Separate sensor from harness to determine fault.
Replace Control.
Determine if problem is with Key Panel or Control by
disconnecting flat cable and measuring cable pins
using pinout chart. Allow up to 1000 ohms when
pressing a key.
If repeated, replace control.
Suspect cooling fan (between ovens) or airflow.
– 26 –
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