MITSUBISHI ELECTRIC PEA-A18AA6 (01) PDF DOCUMENT

The buttons on the wired remote controller for your MITSUBISHI ELECTRIC PEA-A18AA6 perform the following functions:

ON/OFF button: Starts or stops the operation.

Set Temperature buttons (▲/▽): Increases or decreases the set temperature.

Fan Speed button: Selects the fan speed.

Mode button (Return button): Selects the operation mode (e.g., COOL, HEAT, DRY, FAN).

Airflow Up/Down button: Adjusts the vertical airflow direction.

Louver button: Controls the louver operation. Pressing ▼ moves to the preceding operation number, and pressing ▲ moves to the next operation number.

Timer Menu button (Monitor/Set button): Accesses the timer settings menu.

Set Time buttons (◀/▶): Adjusts the time settings (Back/Ahead).

Timer On/Off button (Set Day button): Turns the timer on or off and sets the day.

Filter button: Resets the filter indicator after cleaning.

Test Run button: Starts a test run operation.

Service button (Clear button): Used for service and maintenance purposes.

Ventilation button: Controls the ventilation unit if connected. Pressing ▼ moves to the preceding operation number, and pressing ▲ moves to the next operation number.

The indicators on the remote controller display provide the following information:

Identifies the current operation: Shows the operating mode, etc. Supports multilanguage display.

“Centrally Controlled” indicator: Indicates that operation has been prohibited by a master controller.

“Timer Is Off” indicator: Indicates that the timer is off.

Temperature Setting: Shows the target temperature.

Day-of-Week: Shows the current day of the week.

Time/Timer Display: Shows the current time or the time remaining on the simple or Auto Off timer.

Up/Down Air Direction indicator: Shows the direction of the outcoming airflow.

Room Temperature display: Shows the current room temperature.

Louver display: Indicates the action of the swing louver. It does not appear if the louver is stationary.

(Power On indicator): Indicates that the power is on.

“Sensor” indication: Displayed when the remote controller sensor is used.

“Locked” indicator: Indicates that remote controller buttons have been locked.

“Clean The Filter” indicator: Comes on when it is time to clean the filter.

Timer indicators: The indicator comes on if the corresponding timer is set.

Fan Speed indicator: Shows the selected fan speed.

Ventilation indicator: Appears when the unit is running in Ventilation mode.

Please note the following when operating your MITSUBISHI ELECTRIC PEA-A18AA6:

• Only the Power on indicator lights when the unit is stopped and power is supplied to the unit.

• If you press a button for a feature that is not installed in the indoor unit, the remote controller will display the “Not Available” message. If you are using the remote controller to operate multiple indoor units, this message will appear only if the feature is not present at the parent unit.

• When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication for a maximum of 2 minutes. Please wait until this “PLEASE WAIT” indication disappears before starting the operation.

Model Name		PEA-A18AA(4), (6)
Capacity	BTU/h	Cooling	Heating
		18000	19000
Power source		208/230V (60Hz)
Power input		kW	0.09
Current		A	0.74
Temperature set range Remote controller		°F(°C)	67 to 86 (19 to 30)
Airflow direction		–
Fan	Type x Quantity	Sirocco fan x 4
	External static press	in.WG(Pa)	0.02-0.06-0.14-0.20 (5-15-35-50)
	Motor type	DC brushless motor
	Motor output	kW	0.096
	Driving mechanism	Direct-driven
	Airflow rate(Low-Mid-High)	m³/min	12.0-15.0-18.0
	Airflow rate(Low-Mid-High)	CFM	423-529-635
External finish		Galvanized
External dimension HxWxD	mm	200 x 1190 x 700
	In.	7-7/8 x 46-7/8 x 27-9/16
Net weight		kg	28
Wiring	Min.size of wire	in.(mm)	1/8 (1.6)
	Amperage of wire breaker	A	15
Refrigerant piping diameter R410A	Liquid	in.(mm)	ø1/4 (ø6.35) Flare
	Gas	in.(mm)	ø1/2 (ø12.7) Flare
Drain piping diameter		in.(mm)	O.D. 1-1/4 (32)
Sound level (Low-Mid-High) (measured in anechoic room)		dB<A>	30-34-38
Insulation material		Polystyrene foam, Polyethylene foam, Urethane foam
Air filter		PP Honeycomb fabric (washable)
Refrigerant control device		–
Protection devices		Fuse (250V 6.3A)
Heat exchanger		Cross fin (Aluminum fin and copper tube)
Varistor		ERZV10D471
Terminal block		To outdoor unit: 3P To wired remote controller: 2P
Power outlet		A	20
Standard attachment	Document	Installation Manual, Instruction Book
	Accessory	Drain hose (flexible joint), <Wired Remote Controller>

Note:

1. Cooling/Heating capacity indicates the maximum value at operation under the following condition. <Cooling> Indoor: 80°F D.B. / 67°F W.B. (26.7°C D.B. / 19.4°C W.B.) Outdoor: 95°F D.B. (35°C D.B.). <Heating> Indoor: 70°F D.B. (21.1°C D.B.) Outdoor: 47°F D.B. / 43°F W.B. (8.3°C D.B. / 6.1°C W.B.). Pipe length: 24-9/16ft (7.5m), Height difference: 0ft (0m).

2. Power consumption. Run current at 0.060[in.WG] (15Pa) (external static pressure).

3. Cooling/Heating capacity value at 1:1 system.

The sound pressure levels (SPL) for the MITSUBISHI ELECTRIC PEA-A18AA6 at a 60Hz frequency are as follows. Note that the sound level is measured in an anechoic room where echoes are few when the compressor stops. The actual sound level may be higher under installation conditions due to surrounding echoes and can be about 2 dB higher during cooling and heating operations.

External static pressure: 0.020[in.WG](5Pa)

NOTCH	SPL(dB)
High	37
Middle	33
Low	29

External static pressure: 0.060[in.WG](15Pa)

NOTCH	SPL(dB)
High	38
Middle	34
Low	30

External static pressure: 0.140[in.WG](35Pa)

NOTCH	SPL(dB)
High	39
Middle	35
Low	31

External static pressure: 0.200[in.WG](50Pa)

NOTCH	SPL(dB)
High	39
Middle	36
Low	32

The dimensions for the MITSUBISHI ELECTRIC PEA-A18AA6 indoor unit are provided in the table below (in mm and inches). For detailed diagrams, refer to the technical manual.

Model	A	B	C	D	E	F	G	H	J	K	L	M	N	Gas pipe	Liquid pipe
PEA-A18AA(4), (6)	1100 (43-5/16)	1152 (45-3/8)	1198 (47-3/16)	1060 (41-3/4)	11	1000 (39-3/8)	1200 (47-1/4)	1060 (41-3/4)	9	900 (35-7/16)	24	1239 (48-25/32)	1190 (46-7/8)	ø12.7(1/2)	ø6.35(1/4)

Notes:

1. Use M10 screw for the suspension bolt (field supply).

2. Keep the required service space for maintenance at the bottom.

3. The PEA-A18AA(4), (6) model has 4 fans.

4. In case an inlet duct is used, remove the air filter (supplied with the unit), then install a field-supplied filter at the suction side.

SYMBOL	NAME	SYMBOL	NAME
I.B.	INDOOR CONTROLLER BOARD	TH1	INTAKE AIR TEMP. THERMISTOR
FUSE	FUSE AC250V 6.3A	TH2	PIPE TEMP. THERMISTOR/LIQUID
X1	AUX. RELAY	TH5	COND./EVA. TEMP. THERMISTOR
CN2L	CONNECTOR (LOSSNAY)	FS	FLOAT SWITCH
CN24	CONNECTOR (BACK-UP HEATING)	TB4	TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE)
CN30	CONNECTOR (LLC)	TB15	TERMINAL BLOCK (REMOTE CONTROLLER TRANSMISSION LINE)
CN32	CONNECTOR (REMOTE SWITCH)	RFI	RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT
CN41	CONNECTOR (HA TERMINAL-A)	OPTIONAL PARTS
CN51	CONNECTOR (CENTRALLY CONTROL)	W.B.	IR WIRELESS REMOTE CONTROLLER BOARD
CN90	CONNECTOR (WIRELESS)	RU	RECEIVING UNIT
CN105	CONNECTOR (RADIO FREQUENCY INTERFACE)	BZ1	BUZZER
LED1	POWER SUPPLY (I.B.)	LED1	LED (RUN INDICATOR)
LED2	POWER SUPPLY (I.B.)	SW1	SWITCH (HEATING ON/OFF)
LED3	TRANSMISSION (INDOOR-OUTDOOR)	SW2	SWITCH (COOLING ON/OFF)
SW1	SWITCH (FOR MODEL SELECTION)	R.B.	REMOTE CONTROLLER BOARD
SW2	SWITCH (FOR CAPACITY CODE)	TB6	TERMINAL BLOCK (REMOTE CONTROLLER TRANSMISSION LINE)
SW6	SWITCH (FOR EMERGENCY OPERATION)
SWE	CONNECTOR (EMERGENCY OPERATION)

The refrigerant system in the MITSUBISHI ELECTRIC PEA-A18AA6 consists of a heat exchanger, a distributor, and several thermistors to monitor temperatures.

• The main components are the Heat Exchanger, Room temperature thermistor (TH1), Pipe temperature thermistor/liquid (TH2), and Condenser/evaporator temperature thermistor (TH5).

• Refrigerant flows through the refrigerant GAS pipe connection (Flare) and the refrigerant LIQUID pipe connection (Flare).

• The direction of flow changes depending on whether the unit is in cooling or heating mode.

• Strainers are placed in the refrigerant lines to filter impurities.

The control specifications for a field-installed heater can be set using the function settings. You can select the desired pattern from the table below.

Table.1 [Function table] Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[wireless remote controller])

Mode	Setting	Mode no.	Setting	Initial setting
Heater control	Heater OFF Inlet air temp. ≥ set temp. Heater ON Inlet air temp. < set temp.-4.5°F(2.5°C) • The fan will stop and the heater will turn off when [DEFROST] or [ERROR] is displayed.	23	1	○
	Heater OFF Inlet air temp. ≥ set temp. Heater ON Inlet air temp. < set temp.-4.5°F(2.5°C) • The fan will drive and the heater will turn on when [DEFROST] or [ERROR] is displayed.	23	2	–

*Refer to the Installation Manual for function settings.

When using the optional parts PAC-YU25HT, the fan control pattern during [DEFROST] or [ERROR] display depends on the heater installation and settings.

Fan control patterns when [DEFROST] or [ERROR] is displayed

Use of CN4Y (PAC-YU25HT)	Heater is installed in the duct.	No heater is installed in the duct.
Heater is off.	Unused*	Used
Heater is on.	Fan ON*1	Fan OFF
Fan OFF

*CAUTION: If a heater is installed in the duct, do not use CN4Y. Doing so will cause the fan to turn off when the heater is on, which may result in fire.

*1 Fan speed setting

Mode	Setting		Mode no.	Setting	Initial setting
Fan control	Heating Thermo-OFF	[DEFROST] or [ERROR]	25	1	○
	Very low	Very low		2	–
	STOP	Remote controller setting		3	–

*Refer to the Installation Manual for function settings.

Before troubleshooting your MITSUBISHI ELECTRIC PEA-A18AA6, please check the following:

1. Check the power supply voltage.

2. Check the indoor/outdoor connecting wire for mis-wiring.

During servicing, please take the following care:

1. Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn off the breaker.

2. When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the components.

3. When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

To perform a self-check on your MITSUBISHI ELECTRIC PEA-A18AA6 using the wired remote controller, follow these steps:

1. Turn on the power.

2. Press the [CHECK] button twice.

3. Set the refrigerant address with the [TEMP] button if system control is used.

4. Press the [ON/OFF] button to stop the self-check.

The display will show the CHECK button, Indoor Unit’s Refrigerant address, TEMP button, IC (Indoor unit)/OC (Outdoor unit), Check code, and Indoor Unit No.

Check code	Symptom	Remark
P1	Intake sensor error	For details, check the LED display of the outdoor controller board. As for outdoor unit, refer to service manual OC322.
P2	Pipe (TH2) sensor error
P9	Pipe (TH5) sensor error
E6, E7	Indoor/outdoor unit communication error
P4	Drain sensor error
P5	Drain pump error
P6	Freezing/Overheating protection operation
EE	Communication error between indoor and outdoor units
P8	Pipe temperature error
E0, E3~E5	Remote controller transmission error
E1, E2	Remote controller control board error
Fb	Indoor unit control system error (memory error, etc.)
E9	Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP	Compressor overcurrent interruption
U3,U4	Open/short of outdoor unit thermistors
UF	Compressor overcurrent interruption (When compressor locked)
U2	Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1,Ud	Abnormal high pressure (63H worked)/Overheating protection operation
U5	Abnormal temperature of heat sink
U8	Outdoor unit fan safeguard stop
U6	Compressor overcurrent interruption/Abnormal of power module
U7	Abnormality of super heat due to low discharge temperature
U9,UH	Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit /Current sensor error
Others	Other errors (Refer to the technical manual for the outdoor unit.)

If the unit cannot be operated properly after a test run, refer to the following table to identify the cause.

Symptom		Cause
Wired remote controller	LED 1, 2 (PCB in outdoor unit)
PLEASE WAIT (For about 2 minutes after power-on)	After LED 1, 2 are lighted, LED 2 is turned off, then only LED 1 is lighted. (Correct operation)	For about 2 minutes after power-on, operation of the remote controller is not possible due to system start-up. (Correct operation)
PLEASE WAIT → Error code (After about 2 minutes has expired after power-on)	Only LED 1 is lighted. → LED 1, 2 blink.	• Connector for the outdoor unit’s protection device is not connected. • Reverse or open phase wiring for the outdoor unit’s power terminal block (L1, L2, L3)
Display messages do not appear even when operation switch is turned ON (operation lamp does not light up).	Only LED 1 is lighted. → LED 1 blinks twice, LED 2 blinks once.	• Incorrect wiring between indoor and outdoor units (incorrect polarity of S1, S2, S3) • Remote controller wire short

Note: Operation is not possible for about 30 seconds after cancellation of function selection (Correct operation).

LED	Description
LED1 (power for microcomputer)	Indicates whether control power is supplied. Make sure that this LED is always lit.
LED2 (power for remote controller)	Indicates whether power is supplied to the remote controller. This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address “0”.
LED3 (communication between indoor and outdoor units)	Indicates state of communication between the indoor and outdoor units. Make sure that this LED is always blinking.

The MITSUBISHI ELECTRIC PEA-A18AA6 is equipped with the AUTO RESTART FUNCTION. When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board. The auto restart function activates the moment power is restored after a power failure. The unit will then automatically restart with the previous settings.

Use the following table to diagnose and address specific error codes for your MITSUBISHI ELECTRIC PEA-A18AA6. Turn the power off and on again to operate after checking.

Error Code	Abnormal point and detection method	Cause	Countermeasure
P1	Room temperature thermistor (TH1) Detected if short/open of thermistor. Short: 90°C [194°F] or more, Open: -40°C[-40°F] or less.	① Defective thermistor characteristics ② Contact failure of connector (CN20) ③ Breaking of wire or contact failure ④ Defective indoor controller board	①-③ Check resistance value of thermistor. Check contact failure of connector (CN20). ④ Check room temperature display on remote controller. Replace indoor controller board if there is abnormal difference.
P2	Pipe temperature thermistor/Liquid (TH2) Detected if short/open of thermistor. Short: 90°C[194°F] or more, Open: -40°C[-40°F] or less.	① Defective thermistor characteristics ② Contact failure of connector (CN44) ③ Breaking of wire or contact failure ④ Defective refrigerant circuit ⑤ Defective indoor controller board	①-③ Check resistance value and contact failure. ④ Check pipe temperature in test run mode. If extremely low (cooling) or high (heating), refrigerant circuit may be defective. ⑤ Replace indoor controller board if there is extreme difference with actual pipe temperature.
P4 (5701)	Contact failure of drain float switch (CN4F) Detected when connector is disconnected and not short-circuited.	① Contact failure of connector (Insert failure) ② Defective indoor controller board	① Check contact failure of float switch connector. ② Operate with connector (CN4F) short-circuited. Replace board if abnormality reappears.
P5	Drain overflow protection operation Detected if float switch is underwater for 1 min 30 sec continuously with drain pump on.	① Malfunction/Clogged drain pump ② Clogged drain pipe ③ Defective drain float switch ④ Defective indoor-controller board	①-② Check drain function and pump. ③ Remove connector CN4F and check if it is short (UP) or OPEN (down). Replace if faulty. ④ Replace board if short-circuited between pins of the float switch connector.
P6	Freezing/overheating protection Freezing (Cooling): Pipe temp < -15°C[5°F]. Overheating (Heating): Pipe temp > 70°C [158°F].	① Clogged filter ② Short cycle ③ Low/Over-load operation ④ Defective indoor fan motor ⑤ Defective outdoor fan control ⑥-⑧ Overcharge/Defective refrigerant circuit	①-② Check filter and remove shields. ④ Refer to fan motor troubleshooting. ⑤-⑧ Check outdoor fan and refrigerant circuit condition.
P8	Pipe temperature Detected when pipe temperature is not in the correct range after compressor start.	① Slight temp difference (shortage of refrigerant, disconnected thermistor holder) ②-③ Converse pipe/wire connection ④ Defective thermistor ⑤ Stop valve not opened	①-④ Check pipe/condenser temperature with remote controller. Check for converse connections. ⑤ Ensure stop valve is fully open.
P9	Abnormality of pipe temperature thermistor / Condenser-Evaporator (TH5) Detected if short/open of thermistor. Short: 90°C[194°F] or more, Open: -40°C[-40°F] or less.	① Defective thermistor ② Contact failure of connector (CN44) ③ Breaking of wire ④ Defective refrigerant circuit ⑤ Defective indoor controller board	①-③ Check resistance and connections. ④ Check pipe temperature in test run. If extreme, circuit may be defective. ⑤ If no other problems found, replace indoor controller board.
E0, E4	Remote controller transmission/receiving error Indoor unit or remote controller cannot receive signals for 2-3 minutes.	① Contact failure of transmission wire ② All remotes set as “sub” ③ Mis-wiring ④-⑤ Defective transmitting/receiving circuit ⑥ Noise interference	① Check wire connections. ② Set one remote controller to “main”. ③-⑥ Diagnose remote controllers. Replace faulty components (remote or indoor board). Check for noise sources.
E3, E5	Remote controller transmission/receiving error Remote or indoor board cannot find blank transmission path or receives different data.	① Two remotes set as “main” ② Remote connected to two or more units ③ Repetition of refrigerant address ④-⑤ Defective circuit ⑥ Noise interference	① Set one remote to “main”, other to “sub”. ② Connect remote to one unit only. ③ Set unique addresses. ④-⑥ Diagnose and replace faulty remote/indoor board. Check for noise.
E6	Indoor/outdoor unit communication error (Signal receiving) Indoor board cannot receive signal from outdoor board for 3-6 minutes.	① Contact failure, short circuit, or mis-wiring ②-③ Defective transmitting/receiving circuit ④ Noise interference	① Check connecting wire. ②-④ Check LED on outdoor board. Turn power off/on. If problem persists, replace indoor/outdoor board.
E7	Indoor/outdoor unit communication error (Transmitting) Indoor board detects “1” received 30 times when “0” was sent.	① Defective transmitting circuit ②-③ Noise interference	Turn power off/on. If problem persists, replace indoor board.
Fb	Indoor controller board error Data cannot be read normally from nonvolatile memory.	① Defective indoor controller board	① Replace indoor controller board.
E1, E2	Remote controller control board error Data cannot be read (E1) or clock function fails (E2).	① Defective remote controller	① Replace remote controller.

Phenomena	Cause	Countermeasure
LED2 on indoor controller board is off.	• When LED1 on indoor controller board is also off. ① Power supply of rated voltage is not supplied to outdoor unit.	① Check the voltage of outdoor power supply terminal block. If AC 208~230V is not detected, check the power wiring to the outdoor unit and the breaker.
	② Defective outdoor controller circuit board	② Check the voltage between outdoor terminal block S1 and S2. If not detected, check the fuse on the outdoor controller circuit board and wiring connection.
	③ Power supply of 208~230V is not supplied to indoor unit.	③ Check the voltage between indoor terminal block S1 and S2. If not detected, check indoor/outdoor unit connecting wire for mis-wiring.
	④ Defective indoor controller board	④ Check the fuse on the indoor controller board and the wiring connection. If no problems are found, the indoor controller board is defective.

Phenomena	Cause	Countermeasure
LED2 on indoor controller board is blinking.	• When LED1 on indoor controller board is also blinking. ① Connection failure of indoor/outdoor unit connecting wire	① Check indoor/outdoor unit connecting wire for connection failure.
	• When LED1 is lit. ① Mis-wiring of remote controller wires ② Refrigerant address for outdoor unit is wrong or not set.	① Check the connection of remote controller wires. ② Check the setting of refrigerant address. Set one unit to address 0.
	③ Short-out of remote controller wires	③-④ Remove remote controller wires and check LED2 on the indoor controller board. If LED2 is blinking, check for a short-out. If LED2 is lit, reconnect wires. If it blinks again, the remote controller is defective.
	④ Defective remote controller

The following are the connectors, switches, and test points on the indoor controller board of the MITSUBISHI ELECTRIC PEA-A18AA6:

CN01: Power supply voltage (208 – 230VAC)

SWE: Emergency operation

SW1: Model selection

SW2: Capacity setting

CN105: Radio frequency interface

CN32: Remote start/stop adapter

CN24: Heater control (12VDC)

CN22: For MA remote controller cable connection (10 – 13 VDC between 1 and 3)

CN51: Centralized control

CN41: JAMA standard HA terminal A

CN44: Thermistor (liquid/condenser/evaporator temperature)

CN4F: Float thermistor

CN20: Thermistor (Inlet temperature)

CN3C: Indoor-outdoor transmission (0 – 24VDC)

CNMF Fan motor output:
1-4: 294 – 340 VDC
5-4: 15 VDC
6-4: 0 – 6.5 VDC
7-4: Stop 0 or 15 VDC, Run 7.5 VDC (0 – 15 pulse)

CNP: Drain-up mechanism output (200VAC)

CN2L: LOSSNAY

CN4Y: For Fan control

CN90: Wireless remote controller

Test Voltages (*1):

VFG: Voltage on the (-) side of PC672 and C955 (Same as voltage between 7(+) and 4(-) of CNMF)

Vcc: Voltage between the C955 pins 15 VDC (Same as voltage between 5(+) and 4(-) of CNMF)

Vsp: Voltage between the C626 pins 0VDC (fan stopped), 1-6.5VDC (fan in operation) (Same as voltage between 6(+) and 4(-) of CNMF)

To check the thermistors (TH1, TH2, TH5), measure the resistance with a tester at a part temperature between 10°C (50°F) and 30°C (86°F).

Part name	Check method and criterion
Room temperature thermistor (TH1) Pipe temperature thermistor/liquid (TH2) Condenser/evaporator temperature thermistor (TH5)	Normal	Abnormal
	8kΩ~20kΩ	Opened or short-circuited

If the indoor fan cannot turn, follow this troubleshooting procedure. Note: High voltage is applied to the fan motor connector (CNMF). Do not pull out the connector while power is on.

1. Check Fuse: Check the fuse (FUSE) on the indoor controller board. Did it blow?

• Yes: Check the drain pump (DP) resistance. If not normal, replace the drain pump. If resistance is normal, replace the indoor controller board (I.B.) and the fan motor (MF).

• No: Proceed to the next step.

2. Check Wiring: Check the fan motor connector (CNMF) for a solid connection. Is there a contact failure?

• Yes: Resolve the wiring issue.

• No: Proceed to the next step.

3. Check Power Supply: Remove the CNMF connector and measure the voltage on the indoor controller circuit board.

• TEST POINT ①: VDC (between 1(+) and 4(-)) should be DC294~340V.

• TEST POINT ②: Vcc (between 5(+) and 4(-)) should be DC15V.

Is the voltage normal?

• Yes: The board is likely OK. Proceed to step 4.

• No: Replace the indoor controller board.

4. Check Fan Operation: Reconnect the motor. Does the fan operate?

• Yes: The issue is resolved.

• No (NG): Replace the indoor controller board.

If the fan still does not work after replacing the board, replace the fan motor.

To remove the control box cover:

1. Remove the two fixing screws on the cover (A) to remove it.

1. First, remove the control box cover as described in the control box disassembly procedure.

2. Pull out the thermistor holder (B) and the thermistor (C) from the control box.

Note: Exercise caution when removing heavy parts. Drain the water out of the drain pan before removing it.

1. Removing the filter and the bottom plate

(1) Push up the tab on the filter, and pull out the filter in the direction of the arrow.

(2) Remove the fixing screws on the bottom plate (D), (E) to remove it.

2. Removing the drainpan

(1) Pull out the drain pan in the direction of the arrow.

To avoid dew condensation, use insulated screws in the places marked with circles on the reassembly diagrams.

Note: Exercise caution when removing heavy parts.

1. Remove the drain pan according to its disassembly procedure.

2. Removing the Heat exchanger cover: Remove the four fixing screws on the heat exchanger cover (F) to remove it.

3. Removing the thermistor: Remove the thermistor (G) from the thermistor holder (H) on the copper tube.

Note: Exercise caution when removing heavy parts.

1. Removing the filter and the bottom plate

(1) Push down the tab on the filter, and pull out the filter in the direction of the arrow.

(2) Remove the fixing screws on the bottom plate (J) to remove it.

2. Removing the fan casing (bottom half)

(1) Squeeze the tabs on the fan casing to remove it in the direction of the arrow.

3. Removing the motor cable

(1) Remove the motor cable through the rubber bush.

4. Removing the fan motor and the Sirocco fan

(1) Remove the two motor fixing screws to remove the motor and the Sirocco fan in the direction of the arrow.

(2) Remove the four fan case fixing screws to take the top half of the fan casing off.

Note: This procedure applies to the PEA-A18AA model only. Exercise caution when removing heavy parts.

1. Removing the bearing

(1) Remove the two fixing screws on the bearing cover (K) to remove it.

(2) Remove the two bearing retainer screws to remove the bearing.

Note: Exercise caution when removing heavy parts.

1. Remove the drain pan.

2. Remove the heat exchanger cover.

3. Removing the cover: Remove the two fixing screws on the cover (L) to remove it.

4. Removing the Heat exchanger: Remove the fixing screws on the heat exchanger (M) to remove it.