Mitsumi electronic PKA-A12HA4, PKA-A18HA4 Cause Countermeasure Pipe temperature thermistor

Page 18

Error Code

Abnormal point and detection method

Cause

Countermeasure

 

 

Pipe temperature thermistor/

Defective thermistor

– Check resistance value of thermistor.

 

 

Condenser-Evaporator (TH5)

characteristics

For characteristics, refer to (P1) above.

 

The unit is in 3-minute resume protec-

Contact failure of connector

Check contact failure of connector (CN44) on

 

tion mode if short/open of thermistor is

(CN44) on the indoor controller

the indoor controller board. Refer to 9-7.

 

 

detected. Abnormal if the unit does not

board (Insert failure)

Turn the power on and check restart after

 

get back to normal within 3 minutes. (The

Breaking of wire or contact

inserting connector again.

 

 

unit returns to normal operation, if it has

failure of thermistor wiring

Operate in test run mode and check pipe <con-

 

been reset normally.)

Temperature of thermistor is

denser/evaporator> temperature with outdoor

 

controller circuit board. If pipe

 

 

Constantly detected during cooling,

 

 

 

 

<condenser/evaporator> temperature is exclu-

 

drying, and heating operation (except

 

 

 

sively low (in cooling mode) or high (in heating

 

defrosting)

defective refrigerant circuit.

 

mode), refrigerant circuit may have defect.

 

 

Defective indoor controller

P9

 

Operate in test run mode and check pipe <con-

 

board

 

denser/evaporator> temperature with outdoor

 

 

 

control circuit board. If there is

 

 

 

 

extreme difference with actual pipe

 

 

 

 

<condenser/evaporator> temperature, replace

 

 

 

indoor controller board.

 

 

 

 

There is no abnormality if none of above comes

 

 

 

within the unit.

 

 

 

 

Turn the power off and on again to operate.

 

 

 

In case of checking pipe temperature

)

 

 

 

with outdoor controller circuit board,

 

 

 

be sure to connect A-control service

 

 

 

(tool (PAC-SK52ST).

 

Forced compressor stop

Drain pump trouble

Check the drain pump.

 

 

(due to water leakage abnormality)

Drain defective

Check whether water can be drained.

 

 

The unit has a water leakage abnor-

· Drain pump clogging

 

 

 

mality when the following conditions, a)

· Drain pipe clogging

 

 

 

and b), are satisfied while the above-

Open circuit of float switch

Check the resistance of the float switch.

 

mentioned detection is performed.

Contact failure of float switch

Check the connector contact failure.

 

 

a) The intake temperature subtracted

connector

 

 

 

with liquid pipe temperature detects to

Dew condensation on float switch

Check the float switch leadwire mounted.

 

be less than -10 [14

·Drain water descends along

Check the filter clogging.

 

 

30 minutes. (When the drain sensor

lead wire.

 

 

PA

is detected to be NOT soaked in the

·Drain water waving due to filter

 

 

(2500)

water, the detection record of a) and b)

clogging.

Check the piping connection.

 

 

will be cleared.)

Extension piping connection

 

 

b) Drain float switch detects to be in the

difference at twin, triple, quad-

 

 

 

water for more than 15 minutes.

ruple system.

 

 

 

*Once the water leakage abnormality is

Miswiring of indoor/outdoor

Check the indoor/outdoor connecting wires.

 

detected, abnormality state will not be

connecting at twin, triple, quad-

 

 

 

released until the main power is reset.

ruple system.

Check the room temperature display of

 

 

 

Room temperature thermistor/

 

 

 

liquid pipe temperature thermis-

remote controller.

 

 

 

tor detection is defective.

Check the indoor liquid pipe temperature dis-

 

 

 

play of outdoor controller board.

 

 

 

 

 

 

Remote controller transmission

Contact failure at transmission

Check disconnection or looseness of indoor

 

error(E0)/signal receiving error(E4)

wire of remote controller

unit or transmission wire of remote controller.

 

Abnormal if main or sub remote con-

All remote controllers are set

Set one of the remote controllers “main”

 

troller cannot receive any transmission

as “sub” remote controller. In

if there is no problem with the action above.

 

normally from indoor unit of refrigerant

this case, E0 is displayed on

Check wiring of remote controller.

 

 

address “0” for 3 minutes.

remote controller, and E4 is

 

 

 

(Error code : E0)

displayed at LED (LED1, LED2)

(Do not use cable 3 or more.)

 

 

Abnormal if sub remote controller could

on the outdoor controller circuit

• The number of connecting indoor units:

 

not receive for any signal for 2 minutes.

board.

max. 16 units

 

 

(Error code: E0)

Miswiring of remote controller

• The number of connecting remote control-

 

Abnormal if indoor controller board

Defective transmitting receiving

ler: max. 2 units

 

 

circuit of remote controller

When the above-mentioned problem of

~

 

cannot receive any data normally from

Defective transmitting receiving

are not applied,

 

E0

remote controller board or from other

circuit of indoor controller board

Diagnose remote controllers.

 

or

indoor controller board for 3 minutes.

of refrigerant addresses “0”.

a) When “RC OK” is displayed, remote con-

E4

(Error code: E4)

Noise has entered into the

trollers have no problem. Turn the power

 

Indoor controller board cannot receive

transmission wire of remote

off, and on again to check. If abnormality

 

any signal from remote controller for 2

controller.

generates again, replace indoor controller

 

minutes. (Error code: E4)

 

board.

 

 

 

 

b) When “RC NG” is displayed, replace

 

 

 

remote controller.

 

 

 

 

c) When “RC E3” or “ERC 00-06” is dis-

 

 

 

played, noise may be causing abnormality.

 

 

 

If the unit is not normal after replacing

 

 

 

indoor controller board in group control,

 

 

 

indoor controller board of address “0”

 

 

 

may be abnormal.

 

 

 

 

 

 

18

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Contents Contents Parts Catalog OCB483Reference Manual Service Ref PUZ-A18/24/36NHA4Remote controller Optional parts PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4Safety Precaution Always Observe for SafetyRefrigerant recovery equipment Part Names and FunctionsDisplay Section Operation SectionTemperature setting display Operation Mode displayMode Select button Timer displaySpecifications Service RefNoise Criterion Curves PKA-A12HA4 PKA-A18HA4Outlines and Dimensions Unit inch mmWiring Diagram TB5Refrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingMALFUNCTION-DIAGNOSIS Method by Remote Controller Wired remote controllerCase of trouble during operation U9,UH Appear even when operation Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingErrorE0/signal receiving errorE4 Cause Countermeasure Pipe temperature thermistorRemote controller transmission Condenser-Evaporator TH5Remote controller control board Error Signal receiving errorError Transmitting error Indoor/outdoor unit communicationPerformance failure Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane ControllerHeat pump type When the remote controller cannot be usedEmergency Operation Cooling Only typeCondenser/evaporator temperature HOW to Check the Parts PKA-A12HA4 PKA-A18HA4Lower temperature ThermistorSensor signal check Test Point Diagram Functions of DIP Switch and Jumper Wire Rotation function and Back-up function Outline of functions Special FunctionOperation System constraint2nd stage cut-in setting Request Code ListRotation setting 2nd unit Cut-outBACK-UP Heating Function CN152 How to connectSetting method of each function by wired remote controller Outline of functionsPhoto Disassembly ProcedureOperation Procedure Photos & Illustrations Forward to remove the front panel. See PhotoOperation Procedure Photos Operation Procedure Removing the Nozzle Assembly with Vane PhotoVane Motor and Drain Hose Remove the electrical box cover Remove the room temperature thermistorDisconnect the connector CN20 on the indoor controller BoardPage Page Page New publication, effective Nov

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