Panasonic NE-1021A, NE-1021T, NE-1056T, NE-8051AR, NE-1056A User Manual

Commercial Microwave Oven Error Codes

To allow for easier navigation throughout the tips and guidelines, the entire line of Panasonic
commercial microwave ovens was divided into three categories. Listed below are these categorie s
and their corresponding models.

OCS

PRO-1

PRO-2

While troubleshooting an oven, identify the symptom as accurately as possible and refer to the
following pages for tips and guidelines. Please note that causes and remedies were listed in logical
order and probability of occurrence.

NE-8021AR, NE-8051AR, NE-1021A, NE-1051A, NE-1056A, NE-1021T, NE-1051T,
NE-1056T, NE-1024T, NE-1054T, NE-1064T

NE-1257A, NE-1258A, NE-1757A, NE-2157A, NE-1257R, NE-1258R, NE-1757R,
NE-2157R

NE-1780, NE-2680, NE-1780J, NE-2680J, NE-1780R, NE-26 80R, NE-2180, NE-3280

ERROR
CODE
(SYMPTOM)

F01 + beep

F03 or F04

F05

F09

F33 or F34

F44

POSSIBLE CAUSE AND REMEDY

Temperature in the exhaust duct raised above 260 F due to

a) Fire in the cavity
b) Clogged air filter (not applicable to OCS models)
c) Obstruction of the exhaust duct
d) Shorted temperature sensor

Mismatch between the incoming line voltage and the voltage setting of the oven.

a) Make sure the line voltage corresponds with the setting of the oven. The

voltage selector is located at the back and consists of two plugs. The white
plug sets the oven for 208 V and black plug (or white plug with a black dot)
sets the oven for 230 V.

b) Make sure the line voltage is within +/- 10% tolerance. This is especially

important during summer months, where line voltage has tendency to drop.

c) If both steps above check OK, the error(s) may be caused by defective

controller (DPU) board

Internal memory failure has occurred. Replace the controller (DPU) board

Oven that was designed for 50Hz electricity is attempted to operate in the 60Hz
environment. If the model number of the oven in question is listed above, most likely
the controller (DPU) board has failed.

These codes may be triggered by either excessive heat within the oven or poor
grounding of either the temp sensor or the controller (DPU) board. Check the
following:

a) Clogged air filter (not applicable to OCS models)
b) Obstruction of the exhaust duct or insufficient ventilation
c) Defective thermal sensor (should read 30 – 70 kohm in room temperature)
d) Grounding of the thermal sensor (possible oxidation)
e) Poor connection (oxidation) at CN4 connector (PRO-1 models only)
f) Poor or no ground at the controller (DPU) board – ensure that all screws

securing the board are in place

g) Missing screw(s) that secure the escutcheon to the frame (OCS models

only)

h) If all steps above check OK, the error(s) may be caused by defective

controller (DPU) board

This code will appear if there is malfunction of the keypad. Check:

a) Ribbon connector of the keypad for conductive residue or oxidation
b) Perform continuity test of the keypad (use matrix shown in the service

manual - DPU circuit diagram)

c) Replace the keypad, if both steps prove to be inconclusive

GROUP

OCS
PRO-1
PRO-2

PRO-1
PRO-2

PRO-1

PRO-1

OCS
PRO-1
PRO-2

PRO-1
PRO-2