Welbilt MERRYCHEF conneX Service & Repair Manual page 50

5 Service information
Error codes & fault finding tips
Please adhere to all best safety practices by Merrychef and ensure the High Voltage circuitry has been successfully discharged
before attempting any works on or around the Merrychef unit while the panels are off. Further information can be found at:
merrycheftechnical.com
If in doubt, please contact your Merrychef/Welbilt technical support team for support.
Note: The event log can be accessed directly during an error condition, without switching the oven off and on, by selecting the
settings icon.
Error Problem
E88: SUPPLY Mains supply
VOLTAGE
voltage
ERROR <180VAC or
>264VAC
UI displays; E088 mains supply
Supply voltage
out of range.
Please contact
your Merrychef
service partner to
resolve.
The oven
E101:
Magnetron asked for
system failed at microwave
the moment
power but the
microwave was dynamic
needed measurement
of microwave
UI displays; E101 percentage
Microwave not power is too
responding. low.
Please contact
your Merrychef (the ampere
service partner to values during
microwave
resolve.
operation help
determine
where the fault
is located)
E102: HEATER
The cavity
FAILED reaches 75
above setpoint
UI displays; E102 for >30
heater on without minutes or
request. Please above 300
contact your
Merrychef service
partner to
resolve.
Merrychef conneX ® service and repair manual
Solution
Check mains supply voltage and compare with displayed voltage in diagnostic view.
If similar the fault lies within the kitchen mains supply.
If significantly different, check all connections from the mains supply to the IO
board. If correct, replace IO board.
Use Diagnostic View in the service mode for analysing/testing the individual
magnetrons. One magnetron at a time.
Zero amps (0A) indicates a fault in the primary circuit (wiring from the IO board to
the and including the HV Transformer).
A current draw lower than 5A indicates a fault in the secondary circuit (wiring and
components after and including the HV transformer). Isolate the power supply and
test the high voltage components (HV transformer(s), diode(s), capacitor(s),
magnetron(s) and connections) to find the fault for repair.
DO NOT SUSPECT IT'S THE MAGNETRON AT FAULT FIRST
Go to the event logs, is the mains voltage normal at time of fault? (note that the
current draw detailed in the event log is the sum of all magnetrons fitted, test one
at a time)
Voltage too low, <10% of nominal voltage; There may not be enough voltage to start
the magnetron.
If the above did not resolve the issue, check all the LV connections are tightly fitted,
from the incoming power supply through the Filter, Fuses F5 & F6, Door Switches,
IO board and from the IO board to the HV transformer(s). The connections on the
HV side from the HV Transformer through the Capacitor(s), HV Diode(s) and
Magnetron(s). Also check the HV Transformer(s) is firmly bolted down (the body of
the transformer forms part of the HV circuit).
There are many connections so each of them is important to be tightly connected
and checked. Most important connection: ''the loose one'' (ensure all connections
are solid and in good working condition).
The heating element is activated even though the controller hasn't asked for
o C heating. This typically happens when the output Triac has short circuited.
Check temperature probe is reading a reasonable temperature.
Check temperature probe connections IO X530
Change the UI board and check carefully all related circuitry including loose wiring
o C
and connections.
Ensure the oven cabinet is clean and there are no leaks from the cavity.
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