Mitsubishi SRK25ZD-S User Manual

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47
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Outdoor fan motor error
[Defective fan motor,
defective PCB]
YES
YES
NO
NO
Is connector connection good?
Is voltage applied to fan motor?
Defective fan motor
Correct connector
connection.
Defective indoor unit
PCB
Phenomenon
Thermistor
Shortcircuit Broken wire
Cooling Release of continuous compressor operation command
Heating Continuous compressor operation command is not released.
Cooling System can be operated normally.
Heating High pressure control mode (Inverter stop command)
Cooling 1 in the table below.
Heating Normal system operation is possible.
Operation
mode
Room temperature
thermistor
Continuous compressor operation command is not released.
Release of continuous compressor operation command
Continuous compressor operation command is not
released. (Anti-frosting)
Hot keep (Indoor fan stop)
1 in the table below.
Heat exchanger
thermistor
Phenomenon
Thermistor
Shortcircuit Broken wire
Cooling System can be operated normally.
Heating Defrosting is not performed.
Cooling System can be operated normally.
Heating Defrosting is not operated.
All modes
Operation
mode
System can be operated normally.
Defrosting is performed for 10 minutes at approx. 1 hour.
System can be operated normally.
Defrosting is performed for 10 minutes at intervals of approx. 1 hour.
Compressor stop (There is no inverter output.)
Heat exchanger
pipe thermistor
Outdoor temperature
thermistor
Discharge pipe
thermistor
Compressor overload protection is disabled.
(Can be operated.)
Humidity Sensor
(1)
Note (1) The humidity sensor is included in the 50 type only.
1 Humidity Sensor Operation
Failure Mode Control Input Circuit Reading Air conditioning System Operation
1 Disconnected wire Humidity reading is 0% Operates in the Dry region
2 Disconnected wire Humidity reading is 0% Operates in the Dry region
12 Disconnected wire Humidity reading is 0% Operates in the Dry region
1 and 2 are short
Humidity reading is 100% Operates in the Cooling region.
circuited
Disconnected
wire
Short
Circuit
Remark: Do not perform a continuity check of the humidity sensor with a tester. If DC current is applied, it
could damage the sensor.
Humidity sensor
element
Connector
(CnF)
Humidity sensor assembly
(8) Phenomenon observed after shortcircuit, wire breakage on thermistor.
(a) Indoor unit
(b) Outdoor unit

Mitsubishi SRK25ZD-S Specifications

General

Brand	Mitsubishi
Model	SRK25ZD-S
Category	Air Conditioner
Language	English