Welbilt MERRYCHEF conneX Service & Repair Manual page 51

5 Service information
E103: Ambient The ambient
Overheat temperature
around the UI
3 different error & IO boards
states, see are >65
insufficient
solution 'UI
displays;' cooling of the
components.
Frequently
observed when
the customer
forgets to
clean the front
filter.
E104: cavity The safety
overheat stats thermostat
released
circuit (12vdc)
is open circuit -
UI displays; E104 IO connections
Cavity Overheat X512.
stat triggered.
Please contact
your Merrychef
service partner to
resolve.
E105: Mains Mains supply
Supply
frequency is
Frequency
±2Hz from
Issue nominal
UI displays; E105
Mains Supply
Frequency Issue.
Please contact
your Merrychef
service provider
to resolve.
Merrychef conneX ® service and repair manual
The Air Filter must be cleaned on a daily basis.
Check that the oven is not installed near to a heat source enabling the cooling fan to
draw in hot or grease laden air via the Front Filter.
Check that the Cooling Fan is operating correctly:
o C,
Inspect and ensure that the cooling fan is running freely and that the speed is
correct. If the speed is very slow and running freely replace the cooling fan
capacitor. The wiring of the capacitor is sensitive, ensure you connect the wiring like
for like, otherwise the fan may rotate in the opposite direction. The fan should run
counter clockwise (looking down from above) drawing air from the centre of the fan
into the component interior of the oven, creating a positive cabinet air pressure.
That's why the panels should all be nicely fitting as it is part of the design to ensure
proper air flow and cooling.
The error will remain until the board temperatures drop below 65
Check the board temperatures in the event log and in visual view (in service mode).
UI temperatures significantly higher than the IO can indicate a poor door seal.
UI displays;
• Message 1
if Ambient >70°C, Pre air filter removal.
"Ambient overheat detected, please remove, replace and clean the air filter located below
the door"
• Message 2
if Ambient >70°C for <2mins air filter removed and replaced,
"Oven cooling please wait"
if Ambient <70°C for <2mins air filter removed and replaced,
Oven power cycles, returns to normal operation
Message 3
•
if Ambient >70°C >2Mins, air filter removed and replaced
"E103 ambient overheat.
Please contact your Merrychef service partner to resolve"
Restart button displayed
Manually reset the cavity overheat thermostat at the rear of the oven.
Check the connections on the cavity overheat thermostat and IO board X512.
Check the continuity of cavity overheat thermostat.
Check Cavity overheat thermostat LED14 on the IO board.
Check temperature probe is readings a reasonable temperature.
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.
Mains supply frequency is ±2Hz from nominal or interference e.g., an internal
microwave leak? Most of the issues found here are related to an unstable power
supply of the building, i.e., Generators. It is recommended to check the supply
and/or analyse the error log on a computer
Ensure there are no microwave leaks by inspecting the unit with a suitable
microwave leak detector
Ensure there is a bowl (suitable for microwaves) of water (250ml cold) and activate a
microwave leak test in the service screen mode. Check around the door seals front
and rear of the unit. If microwave leaks are observed (if a level of 5mW/cm
higher is observed the oven must not be used until repaired) unplug from the mains
and investigate. Note: there should be no microwave leakage and corrections
should be made if any leakage is detected above 0.5mW/cm
Check for damaged cavity thermocouple
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o C.
2 or
2 .
51