Switch the oven off and back on. If the error comes back on, before the pre-heat
screen (preventing the oven from operating), the safety circuit is still open, and the
Heater & Microwave SRB safety relays will be de-energised to prevent operation.
Switch the oven off and remove oven from mains supply for 20 mins. Reconnect the
mains supply and switch the oven back on. If the oven still shows the E104 fault the
issue is likely to be the cavity overheat thermostat is open circuit. If fault clears, the
fault is likely to be either with the magnetron(s) or convection fan motor
overheating.
Check all safety trip circuit wiring and connections.
Check the continuity of each switch individually.
The magnetron overheat thermostats(s) and convection fan motor internal
protection should automatically reset once they have cooled down. The cavity
overheat thermostat requires a manual reset by removing the 5.5mm cover bolt
from the back panel (next to the rear vent) and depressing the reset button.
The magnetron and convection fan overheats are typically caused by a lack of
cooling. Check the board temperatures in the error log to determine the cabinet air
temperature at the time of the failure.
Check the magnetron cooling fins (heat sink) are clean and free from dust, debris
and grease build up, clean as required.
Sufficient cooling is required, please ensure all panels are fitted correctly and do not
have any cooling leakages from around the panel work.
Check the air curtain at the front of the unit for sufficient cooling.
The cavity overheat thermostat typically trips if the mains power is disconnected at
the end of service without allowing the cavity to sufficiently cool down first. Noticed
by the E104 error occurring at the beginning of service the next day.
If the magnetron is active when any of overheat thermostats open (trip), the E115
error will be generated (E117 on older firmware revisions)
NOTE: If the magnetrons are tested without the ovens panels in place, which is NOT
RECOMMENDED, the lack of air flow will cause the magnetron(s) to overheat and
cause the magnetron overheat thermostat(s) to open circuit. The panels are
designed to guide the cooling air sufficiently through the cooling fins in a forced
airflow manner.
The convection fan could have stalled. (stopped working)
Check the speed controller/fan speeds up and works properly.
Check the fan rotation (Impinger airflow speed).
Ensure the convection fan can freely turn without obstructions.
Ensure the thermocouple is fitted correctly to the SRB board connector with no
loose connections.
Check for possible signs of a product fire in the cavity
Ensure cable connections are secure, especially the J45 connected cable between
the SRB and the QTS board.
Replace the J45 Communication cable between the QTS and SRB as required.
E107 can be recorded in a non-fault condition during an initial boot up when the
power supply is switched on to the oven and during firmware updates. This is usual
and will be followed by E000 to confirm the communication has been established.
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