Midea M-thermal Mono Series, Installation And Owner'S Manual

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When a safety device is activated, an error code(which does’t include external failure) will be displayed on the user interface.
A list of all errors and corrective actions can be found in the table below.
Reset the safety by turning the unit OFF and back ON.
In case this procedure for resetting the safety is not successful, contact your local dealer.
13.4 Error codes
ERROR
CODE
MALFUNCTION
OR PROTECTION
FAILURE CAUSE
AND CORRECTIVE ACTION
1.The wire circuit is short connected or open. Reconnect the
wire correctly.
2.Water flow rate is too low.
3. Water flow switch is failed, switch is open or close
continuously, change the water flow switch.
Water flow falut(after 3 times
E8)
1.Wire doesn’t connect between wired controller and unit.
connect the wire.
2.Communication wire sequence is not right. Reconnect the
wire in the right sequence.
3.Whether there is a high magnetic field or high power
interfere, such as lifts, large power transformers, etc..
To add a barrier to protect the unit or to move the unit to the
other place.
Communication fault
between controller
and hydraulic module
1.Check the resistance of the sensor
2.The T1 sensor connector is loosen. Reconnect it.
3.The T1 sensor connector is wet or there is water in. remove
the water, make the connector dry. Add waterproof adhesive.
4.The T1 sensor failure, change a new sensor.
Final outlet water
temp.sensor(T1)
fault
1.Check the resistance of the sensor
2.The T5 sensor connector is loosen. Reconnect it.
3.The T5 sensor connector is wet or there is water in. remove
the water, make the connector dry. Add waterproof adhesive
4.The T5 sensor failure, change a new sensor.
5.If you want to close the domestic water heating when T5
sensor do not connected to the system, then T5 sensor can not
be detected, refer to 10.6.1 "DHW MODE SETTING"
water tank temp.sensor (T5)
fault
Check that all shut off valves of the water circuit are completely
open.
1. Check if the water filter needs cleaning.
2. Refer to "9.5 Filling water"
3. Make sure there is no air in the system(purge air).
4. Check the water pressure. The water pressure must be >1
bar.
5. Check that the pump speed setting is on the highest speed.
6. Make sure that the expansion vessel is not broken.
7. Check that the resistance in the water circuit is not too high
for the pump (refer to "10.5 The circulation pump" ).
8. If this error occurs at defrost operation (during space heating
or domestic water heating), make sure that the backup heater
power supply is wired correctly and that fuses are not blown.
9. Check that the pump fuse and PCB fuse are not blown.
Water flow failure
Buffer tank up
temp.sensor(Tbt1) fault
"1.Check the resistance of the sensor.
2.The Tbt1 sensor connector is loosen,reconnect it.
3.The Tbt1 sensor connector is wet or there is water in,remove
the water ,make the connector dry.Add waterproof adhesive.
4.The Tbt1 sensor failure,change a new sensor."