MUFFIN TOASTER MT-12
13
P/N 1010610 Rev. Q 07/16
McDonald’s
Diagnostic Flow Chart
TROUBLESHOOTING
Turn toaster on,
toaster performs
self-test
Toaster passes
self-test
Both indicator lights flash and
an Audio Signal beeps twice
to indicate successful self-test
Heats to more than 105°F
(65°C) but less than 750°F
(400°C) in 30 minutes
BEEP CODES
2 Beeps
= Voltage too low
3 Beeps
= Toaster temperature more than 750°F
(400°C) after 30 minutes
4 Beeps
= Toaster temperature less than 150°F
(65°C) after 30 minutes
5 Beeps
= Thermocouple disconnected or broken
NOTE: All beep codes are followed by a 2 sec-
ond pause, then repeated.
IMPORTANT
Beep Codes
(errors) can occur
any time during
operation.
Less than 150° F (65°C)
(Control turns solid state
relay off). Audio Signal
beeps 4 times, waits 2
seconds, beeps 4 times,
waits 2 seconds, and
continues until unit is
turned off
More than 750°F (400°
C) (control turns solid
state relay off) Audio
Signal beeps 3 times,
waits 2 seconds, beeps
3 times, waits 2 seconds
and continues until unit
is turned off
Refer to
Troubleshooting
Yes
Yes
Yes
No
No
No
Heats to more than 105°F
(65°C) but less than 750°F
(400°C) in 30 minutes
Yes
Door is opened during
cook cycle - Audio Signal
beeps once every second
door is open
No
Door is open for more than 8 consecu-
tive seconds during cook cycle - Audio
Signal beeps very rapidly 15 times
- cook cycle is automatically cancelled.
No
Yes
Yes
Toaster times-out for:
Partial Load (85-125 sec) or
Full load (90-130 sec.)
Unit beeps 2 times per second until front door is opened.
NOTE: Push partial load control knob to turn off partial load light.
Product is
too light
No
Product is
too dark
No
Refer to Troubleshooting
Yes
Product toasted properly
Yes
NOTE: If your toasting times
differ from those shown, contact
the factory for assistance.
