Merrychef ConneX 12 Error Code Diagnostics

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If you’ve been called to a service call for a random letter and numbers displayed on an oven screen, there’s no need to panic. These messages show up to help you determine what’s wrong with equipment and how you can fix it. If you haven’t memorized them all, this guide is here to help. We’ll go over Merrychef ConneX 12 error code diagnostics so you can know what’s causing it and how to fix it.

E088 or E88: Supply Voltage Error

UI Displays: E088 Supply voltage out of range. Please contact your Merrychef service partner to resolve.
Problem: Mains supply voltage is less than 180VAC or over 264VAC.

Solutions

Check the mains supply voltage and compare that with the displayed voltage in the diagnostic view. If they’re similar, then the fault lies within the kitchen mains supply. If they’re different, ensure all the connections from the mains supply to the IO board.
If all voltage readings are correct, the IO board needs to be replaced.

E101: Magnetron System Failed at the Moment Microwave was Needed

UI Displays: E101 Microwave not responding. Please contact your Merrychef service partner to resolve.
Problem: The oven called for microwave power but the dynamic measurement of microwave percentage power is too low.

Solutions

Test the individual magnetrons by using the diagnostic view in service mode. Zero amps will indicate a fault in the primary circuit.
A current draw that’s lower than 5 amps indicates a fault in the secondary circuit. You’ll need to isolate the power supply and test the high voltage components (HV transformers, diodes, capacitors, magnetrons and connections) to find the fault for repair.
Verify that the mains voltage is normal or there may not be enough to start the magnetron.
If none of the above remedies the issue, ensure all the LV connections are tightly fitted from the incoming power supply and that the transformers are firmly bolted down.

E102: Heater Failed

UI Displays: E102 heater on without request. Please contact your Merrychef service partner to resolve.
Problem: The cavity is 75°C above the setpoint for over 30 minutes or over 300°C.

Solutions

Heating element gets activated without the controller calling for heat which is possibly due to a short circuited output triac.
Ensure that the temperature probe is reading a reasonable temperature.
Verify temperature probe connections IO X530 are secure.
Change the UI board and check all related circuitry for loose wiring and connections.
Make sure the oven cabinet is clean and that there’s no leaks from the cavity.

E103: Ambient Overheat

UI Displays: This error has 3 possible error states.
- Message 1: Ambient overheat detected, please remove, replace and clean the air filter located below the door
- Message 2: Oven cooling please wait
- Message 3: E103 ambient overheat. Please contact your Merrychef service partner to resolve
Problem: Ambient temperatures around the UI and IO board are greater than 65°C or insufficient cooling of components. This often occurs due to a dirty filter.

Solutions

Inspect the air filter and clean it as needed. End users need to be cleaning them on a daily basis.
Ensure the oven hasn’t been installed close to a heat source that would cause the cooling fan to draw in hot or grease laden air via the front filter.
Ensure the cooling fan is in working order. It needs to run freely, in a counterclockwise motion at proper speeds. If it isn’t clogged but is running slowly, replace the cooling fan capacitor.
Use the event logs to check the board temperatures. If the UI temperature is higher than the IO’s, it could be because of a poor door seal.

E104: Cavity Overheat Stats Released

UI Displays: E104 Cavity Overheat stat triggered. Please contact your Merrychef service partner to resolve
Problem: The safety thermostat circuit is open. This can occur if the main power is being disconnected before the cavity can sufficiently cool down.

Solution

Manually reset the cavity overheat thermostat. This is located at the back of the unit.
Check that the cavity overheat thermostat and IO board X512 connections are secure.
Make sure the cavity overheat thermostat has continuity.
Check Cavity overheat thermostat LED14 on the IO board is in working order.
Verify the temperature probe is reading reasonable temperatures.

E105: Mains Supply Frequency Issue

UI Displays: E105 Mains Supply Frequency Issue. Please contact your Merrychef service provider to resolve.
Problem: Mains supply frequency is ±2Hz from nominal. Most of the issues found here are related to an unstable power supply of the building.

Solution

Use a microwave leak detector to ensure there are no microwave leaks present.
Put a microwave safe bowl with 250 ml of cold water in the unit cavity. Then run the microwave leak test in the service screen mode.
Check around the door seals for microwave leaks.
Verify the cavity thermocouple isn’t damaged.

E106: Cavity Overheat

UI Displays: E106 cavity overheat detected. Please contact your Merrychef service partner to resolve.
Problem: The cavity is 75°C above the setpoint for over 30 minutes or over 300°C during a cook cycle.

Solution

Check for possible product fires in the cavity.
Heating element gets activated without the controller calling for heat which is possibly due to a short circuited output triac.
Ensure that the temperature probe is reading a reasonable temperature.
Verify temperature probe connections IO X530 are secure.
Change the UI board and check all related circuitry for loose wiring and connections.
Make sure the oven cabinet is clean and that there’s no leaks from the cavity.

E107: COMs Error

UI Displays: E107 UI – IO Communication failure. Please contact your Merrychef service partner to resolve
Problem: A communication error has occured between the UI and IO boards and is observed in the event log.

Solution

Ensure all cable connections between the UI and IO boards are secure.
Replace the communication cable between the two boards as needed.

E108: UI uSD Failed

UI Displays: E108 UI SD card error. Please contact your Merrychef service partner to resolve.
Problem: The uSD card is either missing or corrupted.

Solution

Verify the card is properly seated on the UI board.
Replace the card.
Ensure the installed card is properly transferred and has the most up to date firmware.

E109: IO PM Error

UI Displays: E109 IO PM error. Please contact your Merrychef service partner to resolve.
Problem: The PM code for the IO board is incorrect.

Solution

Verify the PM chip is installed into the board correctly.
Replace the PM chip.
Ensure the installed chip is properly transferred and has the most up to date firmware.

E110: IO Version Conflict

UI Displays: E110 IO firmware error. Please contact your Merrychef service partner to resolve.
Problem: An incompatible firmware version is being used for the UI and IO boards. This can occur due to board replacements or from loading the incorrect firmware.

Solution

Download the up to date firmware from Merrychef. Then load it to the oven.
If the issue continues, replace the IO PM and reload the firmware.
Ensure there’s no microwave leaks around the board.

E111: Cavity Sensor Failure

UI Displays: E111 Cavity Sensor Failure. Please contact your Merrychef service partner to resolve
Problem: The cavity thermocouple is unplugged or damaged.

Solution

Verify the thermocouple is properly fitted and securely connected to the IO board.
For a thermocouple that generates erratic values or is more than 25°C out of range, replace it.
If the fault still occurs after replacing the thermocouple, replace the IO board.

E112: IO Board Temp Sensor

UI Displays: E112 IO Board Temperature sensor failure. Please contact your Merrychef service partner to resolve.
Problem: The ambient temperature sensor on the IO board has failed.

Solution

Replace the IO board and ensure it has the most up to date firmware installed.

E113: Magnetron On Without Request

UI Displays: E113 Microwave On Without Request. Please contact your Merrychef service partner to resolve.
Problem: Despite the microwave circuit being switched off, there is a current draw greater than 1 amp detected on the IO board.

Solution

Replace the IO board and ensure it has the most up to date firmware installed.

E116: Heater Not Responding

UI Displays: E116 Heater not responding. Please contact your Merrychef service partner to resolve.
Problem: The unit is calling for heat but isn’t reaching 100°C within 30 minutes.

Solution

Make sure all connections from the incoming power supply through the filter, fuses F3 and F4, IO board and heating element are in good condition and secure.
Check the heater element connections are secure and in good condition.
Replace the IO board if none of the above remedied the fault.

E117: RH Microwave Overheat

UI Displays: This error has 3 possible error states.
- Message 1: E117 Magnetron overheat detected. Please remove, replace and clean the air filter located below the door
- Message 2: Magnetron overheat recovery, Oven Cooling, please wait….
- Message 3: E117 Magnetron overheat ” recovery unsuccessful, Please contact your Merrychef service partner to resolve
Problem: The safety thermostat circuit is stuck open.

Solution

Check the cavity overheat thermostat and IO board X513 connections are secure.
Verify there is continuity for the magnetron overheat thermostat.
Make sure the magnetron overheat thermostat LED16 on the IO board is working and properly connected.
Once the oven has cooled, the magnetron overheat thermostat should automatically reset itself.
Check the board temperatures in the event logs to determine the cabinet temperature at the time of failure to confirm if there’s a lack of cooling.
Inspect the magnetron cooling fans to ensure they’re clean and free of debris, dust and grease. Clean them as needed.
Make sure the panels are fitted correctly and aren’t causing any cooling leakages.
Verify the cooling fan is clear of blockages and operating properly.
Clean the air filter if it’s dirty.
Check that the air curtain at the front of the unit has sufficient cooling.

E118: LH Microwave Overheat

Problem: The safety thermostat circuit is stuck open.

Solution

Check the cavity overheat thermostat and IO board X514 connections are secure.
Make sure the magnetron overheat thermostat LED18 on the IO board is working and properly connected.
See E117 for more solutions.

E-1: Unknown Error

Problem: Internal error.

Solution

Update the oven’s firmware.

E0: X510 Jumper is Missing

UI Displays: E-1 Insert X510 jumper into correct position
Problem: The jumper is missing from the IO board. This commonly occurs when a board is replaced.

Solution

Install a jumper across the front two pins of connection X510 on the IO board.
If the fault occurs still after installing a jumper, replace the IO board.

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