Maytag MXS20 Programming Manual page 61

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.
DIAGNOSE:
1. For a new Inverter or washer computer, check if the correct
washer type and washer power supply have been selected.
2. Check if the door is closed and locked.
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.
4. Check if the fuses are still operational.
5. Check if the Inverter contactor is activated.
6. Check if the connectors on both sides of the communication
cable are still connected.
7. Check the wiring for continuity.
8. Check if the output relays that activates the Safety Inverter
contactor is functional.
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.
2. Check if the dedicated Inverter Parameters have been loaded
by the washer computer.
3. Check if the power supply is sufficient high and stable during
extraction with load.
4. Check if the drum rotates normally by hand.
5. Check if the fault is persistent.
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.
2. Check if the dedicated Inverter Parameters have been
loaded by the washer computer.
3. Check if there was a high unbalance during extraction,
which can be caused by putting only half loads in the
washer.
4. Check if the fault is persistent.
When the Inverter Parameters are loaded at the Configuration
Menu, make sure that you have selected the correct washer type
and washer power supply.
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.
Repair the power supply.
If the supply voltage is OK and the power LED is not
illuminated, replace the Inverter.
If the fuses are blown, replace the fuses.
If the contactor is broken, replace the contactor.
Connect the connectors on the washer computer and
the Inverter.
Repair the wiring.
If the relay is broken, replace the washer computer.
If the incorrect Machine Type is selected, enter the correct
Machine Type.
Load the correct Inverter Parameters.
Repair the power supply.
Repair/clean what is necessary.
If the fault is persistent, contact Maytag.
If the incorrect Machine Type is selected, enter the correct
Machine Type.
Load the correct Inverter Parameters.
Always put a full load in the washer.
Do not put materials other than textile linen (fabrics)
in the washer.
If the fault is persistent, contact Maytag.
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