Panasonic · Microwave error code

F33 / F34Exhaust temperature sensor open (F33) or shorted (F34)

Single source High-voltage / caution

Unlock what this code means, its causes, tests and parts

Full library + AI assistant + the OnCall Tech app for iPhone & Android. $34.90, one time.

Get lifetime access

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

Related diagnostic guides

Component test · Microwave

Magnetron: filament and filament-to-case tests (microwave)

The magnetron turns high voltage into microwave energy. An ohmmeter can catch an open filament or a filament shorted to the case, but it cannot prove the tube makes full power. Rule out the HV diode, capacitor and transformer before ordering a magnetron.

6 steps ~40 minadvanced

More Panasonic microwave codes

Panasonic · Microwave

E01

Fault - stop using

Single source High-voltage / caution

Panasonic · Microwave

F04

Line voltage too high for setting

Cross-checked High-voltage / caution

Panasonic · Microwave

F05

Control memory failure

Cross-checked High-voltage / caution

Panasonic · Microwave

F44

Keypad pressed too long / keypad fault

Cross-checked High-voltage / caution

Panasonic · Microwave

H95

No microwave oscillation (magnetron/inverter)

Cross-checked High-voltage / caution

Panasonic · Microwave

H96

Inverter / high-voltage circuit fault

Cross-checked High-voltage / caution
Panasonic microwave error F33 / F34: Exhaust temperature sensor open (F33) or shorted (F34) · OnCall Tech