Welbilt MERRYCHEF conneX Service & Repair Manual page 54

5 Service information
E117: RH The safety
Microwave thermostat
overheat circuit (12vdc)
is open circuit -
3 different error IO connections
states, see X513.
solution 'UI
displays;
E118: LH The safety
Microwave
thermostat
overheat circuit (12vdc)
is open circuit -
IO connections
X514.
E-1 Unknown
Internal error
Error
E0: X510 jumper Jumper missing
is missing
on replacement
of new IO board
UI displays; E-1
Insert X510 jumper
into correct
position
Merrychef conneX ® service and repair manual
Check the connections on the cavity overheat thermostat and IO board X513.
Check the continuity of magnetron overheat thermostat.
Check magnetron overheat thermostat LED16 on the IO board.
The magnetron overheat thermostat should automatically reset once it has cooled
down.
A magnetron overheat is typically caused by a lack of cooling. Check the board
temperatures in the event 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 cooling fan operation.
Check / clean the air filter.
Check the air curtain at the front of the unit for sufficient cooling.
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.
UI displays;
Message 1
•
if Mag stat >125°C, open circuit, Pre air filter removal
"E117 Magnetron overheat detected. Please remove, replace and clean the air filter
located below the door"
Message 2
•
if Mag stat >125°C, open circuit, <2minutes, post air filter removal
"Magnetron overheat recovery, Oven Cooling, please wait .... "
if Mag stat <125°C, closed circuit, <2minutes, post air filter removal the oven power
cycles and returns to normal operation.
Message 3
•
if Mag stat >125°C, open circuit, >2minutes, post air filter removal
"E117 Magnetron overheat " recovery unsuccessful, Please contact your Merrychef
service partner to resolve"
Restart button displayed
Check the connections on the cavity overheat thermostat and IO board X514.
Check magnetron overheat thermostat LED18 on the IO board.
See E117
Download the up to date firmware from merrycheftechnical.com and load on to
the oven.
Install a jumper across the front two pins of connection X510 on the IO board. If fault
remains, new IO board required.
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