Mitsumi electronic PKA-A12HA4 Troubleshooting by Inferior Phenomena, Performance failure

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9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote

 

controller.

 

Phenomena

Cause

Countermeasure

(1)Upward/downward vane

The vane is not downward during defrosting and heat

Normal operation (The vane is set to

performance failure

preparation and when the thermostat is OFF in HEAT

horizontal regardless of remote control.)

 

mode. (Working of COOL protection function)

Check (left).

 

Vane motor does not rotate.

 

• Defective vane motor

• Check the vane motor. (Refer to “How

 

• Breaking of wire or connection failure of connector

to check the parts”.)

 

 

• Check for breaking of wire or connec-

 

Upward/downward vane does not work.

tion failure of connector.

 

Normal operation (Each connector on

 

• The vane is set to fixed position.

vane motor side is disconnected or set-

 

 

ting the fixed vanes by wired remote

 

 

controller.)

 

 

 

(2)Receiver for IR wireless remote

Weak batteries of IR wireless remote controller

Replace batteries of IR wireless remote

controller

 

controller.

 

Contact failure of connector (CNB) on IR wireless

~

 

remote controller board

Check contact failure of each connector.

 

(Insert failure)

If no problems are found of connector,

 

Contact failure of connector (CN90) on indoor con-

replace indoor controller board.

 

troller board (Insert failure)

When the same trouble occurs even if

 

Contact failure of connector between IR wireless

indoor controller board is replaced,

 

remote controller board and indoor controller board

replace IR wireless remote controller

 

 

board.

 

 

 

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Contents Contents Parts Catalog OCB483Service Ref PUZ-A18/24/36NHA4 Remote controller Optional partsReference Manual PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4Safety Precaution Always Observe for SafetyRefrigerant recovery equipment Part Names and FunctionsDisplay Section Operation SectionOperation Mode display Mode Select buttonTemperature setting display Timer displaySpecifications Service RefNoise Criterion Curves PKA-A12HA4 PKA-A18HA4Outlines and Dimensions Unit inch mmWiring Diagram TB5Refrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingCase of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerWired remote controller U9,UH Wired remote controller LED 1, 2 PCB in outdoor unit Unit’s power terminal block L1, L2, GRAppear even when operation Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingCause Countermeasure Pipe temperature thermistor Remote controller transmissionErrorE0/signal receiving errorE4 Condenser-Evaporator TH5Error Signal receiving error Error Transmitting errorRemote controller control board Indoor/outdoor unit communicationTroubleshooting by Inferior Phenomena Phenomena Cause Countermeasure 1Upward/downward vanePerformance failure ControllerWhen the remote controller cannot be used Emergency OperationHeat pump type Cooling Only typeHOW to Check the Parts PKA-A12HA4 PKA-A18HA4 Lower temperatureCondenser/evaporator temperature ThermistorSensor signal check Test Point Diagram Functions of DIP Switch and Jumper Wire Special Function OperationRotation function and Back-up function Outline of functions System constraintRequest Code List Rotation setting2nd stage cut-in setting 2nd unit Cut-outHow to connect Setting method of each function by wired remote controllerBACK-UP Heating Function CN152 Outline of functionsDisassembly Procedure Operation Procedure Photos & IllustrationsPhoto Forward to remove the front panel. See PhotoOperation Procedure Photos Vane Motor and Drain Hose Operation ProcedureRemoving the Nozzle Assembly with Vane Photo Remove the room temperature thermistor Disconnect the connector CN20 on the indoor controllerRemove the electrical box cover BoardPage Page Page New publication, effective Nov

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