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FAILURE 27: COMMUNICATION FAULT INVERTER
This fault will only occur when there is no communication between the washer computer and the Inverter. The computer is
sending requests to the Inverter, and the Inverter is sending answers to the computer. If the computer is not receiving
the answers within 5 seconds, fault 27 will be displayed.
1. For a new Inverter or washer computer, check if the correct
washer type and washer power supply have been selected.
When the Inverter Parameters are loaded at the Configuration
Menu, make sure that you have selected the correct washer type
and washer power supply.
2. Check if the door is closed and locked. If the door is not closed then the Inverter cannot be powered.
Close the door.
If the door lock is broken, repair the door lock system.
3. Check if the Inverter is energized.
If the Inverter power LED is not illuminated, measure if there is
supply voltage at the Inverter input terminals.
Repair the power supply.
If the supply voltage is OK and the power LED is not
illuminated, replace the Inverter.
4. Check if the fuses are still operational. If the fuses are blown, replace the fuses.
5. Check if the Inverter contactor is activated. If the contactor is broken, replace the contactor.
6. Check if the connectors on both sides of the communication
cable are still connected.
Connect the connectors on the washer computer and
the Inverter.
7. Check the wiring for continuity. Repair the wiring.
8. Check if the output relays that activates the Safety Inverter
contactor is functional.
If the relay is broken, replace the washer computer.
DIAGNOSE:
FAILURE 28: THT (Mitsubishi) TIME OUT
Fault 28 occurs when the washer computer can not handle the THT (Mitsubishi) fault of the Frequency Inverter. This fault is a specific fault
of the Frequency Inverter caused by an over current.
DIAGNOSE:
1. Check if the correct Machine Type is selected at the
Configuration Menu.
If the incorrect Machine Type is selected, enter the correct
Machine Type.
2. Check if the dedicated Inverter Parameters have been loaded
by the washer computer.
Load the correct Inverter Parameters.
3. Check if the power supply is sufficient high and stable during
extraction with load.
Repair the power supply.
4. Check if the drum rotates normally by hand. Repair/clean what is necessary.
5. Check if the fault is persistent. If the fault is persistent, contact Maytag.
FAILURE 29: OV3 (Mitsubishi)/E.OP (KEB) TIME OUT
Fault 29 occurs when the washer computer can not handle the OV3 (Mitsubishi) fault of the Frequency Inverter. This fault is a specific fault
of the Frequency Inverter caused by an overvoltage.
DIAGNOSE:
1. Check if the correct Machine Type is selected at the
Configuration Menu.
If the incorrect Machine Type is selected, enter the correct
Machine Type.
2. Check if the dedicated Inverter Parameters have been
loaded by the washer computer.
Load the correct Inverter Parameters.
3. Check if there was a high unbalance during extraction,
which can be caused by putting only half loads in the
washer.
Always put a full load in the washer.
Do not put materials other than textile linen (fabrics)
in the washer.
4. Check if the fault is persistent. If the fault is persistent, contact Maytag.
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