Midea MAD020T1N1S1 Technical Manual page 90

MCAC-PDSM-2013-04
 Common faults and handling methods of humidification system
Symptom
No
humidification
effect
 Common faults and handling methods of heating system
Symptom
Heating system does not operates,
contactor do not contact together.
The contactor contacted together,
but no heating effect.
 Common faults and handling methods of refrigeration system
Symptom
Compressor
cannot run.
Symptom
Compressor
cannot run.
Probable reason
No water filling in the humidification tank
or low filling water pressure.
No humidification requirement.
No 24V AC input at controlling sire side of
humidification contactor.
No heating requirement.
Heating temperature controller is
broken off and not reset.
Heater error.
Probable reason
Power off. (Off the unit.)
Power overload and the air switch broke off.
Electrical circuit connection is loose.
Compressor wire circuit has burnt.
The built-in protector of compressor has
broken off.
Probable reason
Power off. (Off the unit.)
Power overload and the air switch broke off.
Electrical circuit connection is loose.
Compressor wire circuit has burnt.
The built-in protector of compressor has
broken off.
The contactor cannot contact together. No
24V voltage input for the compressor control
wires. Or not reach the operating conditions
of compressor.
Midea Precision AC Technical Manual-Down Delivery Series
Check items or handling methods
Check the water source.
Check the water inlet solenoid valve is open.
Check whether the water inlet pipe has blocked.
Check manual operator.
Controller error.
Wiring from controller to the humidification
contactor controlling wire port is loose.
Probable reason
Check items or handling methods
Check the main power switch, fuse and
connecting wires.
Manual reset, check the current and air switch.
Fasten the connection.
Check the compressor terminal.
Check whether the compressor wire circuit is
open. If open, cool down the protector, then
automatically reset.
Check items or handling methods
Check the main power switch, fuse and
connecting wires.
Manual reset, check the current and air switch.
Fasten the connection.
Check the compressor terminal.
Check whether the compressor wire circuit is
open. If open, cool down the protector, then
automatically reset.
Check the manual operator parameters setting
correct or not. Check whether the controller is
error, or wiring from controller to compressor
port is loose.
Check items or handling methods
Check the controller status.
1. Wait for the controller reset.
2. Change a new controller.
Turn off the power, check the
heating pipe and wire.
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