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:
https://www.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.
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 testing the magnetron. 5.5 – 6
Amps.
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, diode, capacitor, magnetron
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. The connections on the HV
side from the HV Transformer through the Capacitor, HV Diode and Magnetron.
Also check the HV Transformer 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 has energised even though the controller hasn’t asked for
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
and connections.
Ensure the oven cabinet is clean and there are no leaks from the cavity.
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