Sanyo EM-CD2900UK Service Manual page 15

C. ERROR INDICATION C. ERROR INDICATION
C. ERROR INDICATION C. ERROR INDICATION C. ERROR INDICATION
The Display will show an error indication for self diagnosis as follows.
"E" means that a service technician is required.
"U" means that user can correct the operation.
Display Trouble
●Microwave relay is welded.
E-12 ●Magnetron thermistor in mode heater
a temperature of 90℃ or higher.
●Thermistor (on cavity) senses a
temperature of 300℃ or higher.
E-21 ●Heater relay (upper) is welded.
●Thermistor on cavity temperature of
240℃ or higher.
●Thermistor (on Magnetron or Oven)
E-31
is shorted.
●Thermistor (on Magnetron, Oven or
E-32 upper Heater) senses a temperature
of 20℃ or lower.
●One touch memory cooking is not
E-22
available.
●When the Memory key is pressed
after 30 sec. or more have passed
from closing the door.
U-50
●When the START key is pressed
30 sec. or more have passed
after heater preheating finished.
Thermistor connector
Other Symptom
●Oven stops heating.
●Buzzer continuously beeps.
●Oven stops heating.
●Buzzer continuously beeps.
●Blower motor will stop
immediately.
●Oven stops heating.
●Oven stops heating.
●Buzzer does not beep.
―
●Memory key and Start key are
not available.
Duct
8000
7000
6000
5000
Magnetron
4000
3000
2000
1000
0
‑ 14 ‑
Solution
●Check for relay circuit board on Blower motor.
→ This error function will be cancelled when the
CLEAR key is touched.
●Check and remove the cause of the cavity fire
or abnormal overheating. (such as operation
with no food)
●Check for relay circuit board.
→ This error function will be cancelled when the
power cord is unplugged.
●Check for short-circuit of thermistor itself or
wire insulation of thermistor.
→ This error function will be cancelled when the
power cord is unplugged.
●Check for open-circuit of thermistor itself or
improper connection of wire socket of
thermistor.
●Check for upper heater.
→ This error function will be cancelled when the
CLEAR key is touched.
Check for error count on PCB board.
→ See page 8.
→ This error function will be cancelled when
the door is opened and closed, or the power
cord is unplugged.
Thermistor Chart
0 10 20 30
Temperature (°C)
40 50 60