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Hitachi RAK-15QEF Service Manual
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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
RAK-15QEF
RAK-50REF
RAK-18REF
RAK-25REFC
RAK-25REF
RAK-35REFC
RAK-35REF RAK-50REFC
RAC-18WEF,RAC-25WEF,RAC-35WEF,RAC-50WEF(JCH-WH NO.0132E)
for items not described in this manual.
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT (W
TOTAL AMPERES (A)
COOLING
(KW)
CAPACITY
(B.T.U./h)
TOTAL INPUT (W
TOTAL AMPERES (A)
HEATING
(KW)
CAPACITY
(B.T.U./h)
W
DIMENSIONS
H
(mm)
D
NET WEIGHT
(Kg)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
INDOOR UNIT
RAR-7PE1
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
RAK-25REF
RAK-18REF
RAC-18WEF
RAK-25REFC
1
P
H
A
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
580 (
250
1,010)
3.19-3.05
2.00 (0.90 2.50)
6,820 (3,070 8,530)
620 (250 970)
3.62-3.46
2.50 (0.90 3.20)
8,530 (3,070 10,920)
780
660(+60)
280
530
215
278(+55)
7.7
23.7
INDOOR UNIT
JCH-WH
RAK-15QEF
RAK-18REF
RAK-25REF
RAK-35REF
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ----------------------------------------------------------------
HOW TO USE ----------------------------------------------------------------------
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------
MAIN PARTS COMPONENT --------------------------------------------------
WIRING DIAGRAM ---------------------------------------------------------------
CIRCUIT DIAGRAM --------------------------------------------------------------
BLOCK DIAGRAM ----------------------------------------------------------------
BASIC MODE ----------------------------------------------------------------------
REFRIGERATING CYCLE DIAGRAM --------------------------------------
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY -----------
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------
SERVICE CALL Q & A ----------------------------------------------------------
PARTS LIST AND DIAGRAM --------------------------------------------------
DC INVERTER
OUTDOOR UNIT
INDOOR UNIT
RAK-35REF
RAC-25WEF
RAK-35REFC
1
P
H
A
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
1
P
H
A
700 (250 1,290)
1,090 (250 1,460)
3.84-3.67
2.50 (0.90 3.10)
3.50 (0.90 4.00)
8,530 (3,070 10,580)
11,940 (3,070 13,650)
880 (250 1,250)
1,100 (250 1,700)
4.56-4.36
3.40 (0.90 4.40)
4.20 (0.90 5.00)
11,600 (3,070 15,010)
14,330 (3,070 17,060)
780
660(+60)
780
280
530
280
215
278(+55)
215
7.7
23.7
7.7
1
NO.0131E
RAK-50REF
RAK-25REFC
RAK-35REFC
RAK-50REFC
CONTENTS
OUTDOOR UNIT
INDOOR UNIT
RAK-50REF
RAC-35WEF
RAK-50REFC
S
, E
0 5
H
z
2 ,
0 2
2 -
0 3
V
1
P
H
A
S
, E
0 5
1,560 (500 2,100)
5.41-5.18
7.16-6.85
5.00 (1.90 5.20)
17,060 (6,480 17,740)
1,660 (500 2,750)
5.56-5.31
7.62-7.29
6.00 (2.20 7.30)
20,470 (7,510 24,910)
660(+60)
780
530
280
278(+55)
215
25.0
8.2
6
8
19
20
21
23
24
25
38
40
42
54
80
OUTDOOR UNIT
RAC-50WEF
H
z
2 ,
0 2
2 -
0 3
V
792(+91)
600
299(+47)
39.5

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Summary of Contents for Hitachi RAK-15QEF

  • Page 1 20,470 (7,510 24,910) 660(+60) 660(+60) 660(+60) 792(+91) DIMENSIONS (mm) 278(+55) 278(+55) 278(+55) 299(+47) NET WEIGHT (Kg) 23.7 23.7 25.0 39.5 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
  • Page 2 6$)(7< '85,1* 5(3$,5 :25.  ,Q RUGHU WR GLVDVVHPEOH DQG UHSDLU WKH XQLW LQ TXHVWLRQ EH VXUH WR GLVFRQQHFW WKH SRZHU FRUG SOXJ IURP WKH SRZHU RXWOHW EHIRUH VWDUWLQJ WKH ZRUN  ,I LW LV QHFHVVDU\ WR UHSODFH DQ\ SDUWV WKH\ VKRXOG EH UHSODFHG ZLWK UHVSHFWLYH JHQXLQH SDUWV IRU WKH XQLW DQG WKH UHSODFHPHQW PXVW EH HIIHFWHG LQ FRUUHFW PDQQHU DFFRUGLQJ WR WKH LQVWUXFWLRQV LQ WKH 6HUYLFH 0DQXDO RI WKH XQLW ,I WKH FRQWDFWV RI HOHFWULFDO...
  • Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufactures during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned.) 2.
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of Al. stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1MΩ(1/2W) Staple Earth wire Fig.3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate...
  • Page 5 CAUTION In quiet or stop operation, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and turn off the circuit breaker for safety. In the event of power failure,the room air conditioner will restare automatically in the previously selected mode once the power is restored.
  • Page 6 SPECIFICATIONS RAK-15QEF,RAK-18REF,RAK-25REF,RAK-35REF RAK-50REF,RAK-25REFC,RAK-35REFC,RAK-50REFC 38W (DC340 V)
  • Page 7 Figure showing the installation of lndoor unit MODEL RAK-15QEF RAK-18/25/35/50REF RAK-25/35/50REFC above Be sure to 50mm completely above seal any 50mm gap with putty. a b o v e 5 0 m m 2 3 0 0 m m o r m o r e...
  • Page 19 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-15QEF,RAK-18REF,RAK-25RE F,RAK-35REF,RAK-50REF RAK-25REFC,RAK-35REFC,RAK-50REFC INDOOR UNIT (RAK-18/25/35REF、RAK-25/35REFC) ( 12.7) (RAK-50REF、RAK-50REFC) 450mm 445mm 220mm 15mm More than More than 123mm 123mm 50mm 50mm 32.5mm 22mm 65mm 80mm 60mm 85mm 440mm 534mm 780mm Service space...
  • Page 20 MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) RAK-15QEF,RAK-18/25/35/50REF,RAK-18/25/35/50REFC FAN MOTOR RAK-15QEF,RAK-18/25/35/50REF,RAK-18/25/35/50REFC DC:340V 340V 0~65V...
  • Page 21 WIRING DIAGRAM MODEL RAK-15QEF,RAK-18/25/35/50REF,RAK-18/25/35/50REFC...
  • Page 22 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RAR-7PE1...
  • Page 23 CIRCUIT DIAGRAM MODEL RAK-15QPE,RAK-18/25/35/50REF,RAK-25/35/50REFC AX-17H725...
  • Page 24 BLOCK DIAGRAM MODEL RAK-15QEF,RAK-18/25/35/50REF,RAK-25/35/50REFC Frost wash Humidity Sensor (AX17H725V13)
  • Page 25 MODEL RAK-15QPE,RAK-18/25/35/50REF,RAK-25/35/50REFC...
  • Page 26 RAK-25REF RAK-35REF RAK-50REF MODEL RAK-15QEF RAK-18REF RAK-25REFC RAK-35REFC RAK-50REFC LABEL NAME VALUE WMAX 4000min-1 4000min-1 5400min-1 5800min-1 5400min-1 WMAX2 4200min-1 4200min-1 5800min-1 6250min-1 5700min-1 WSTD 3100min-1 3100min-1 4500min-1 5200min-1 4600min-1 CMAX 4300min-1 4300min-1 4600min-1 5850min-1 5500min-1 CMAX2 4300min-1 4300min-1 4600min-1...
  • Page 27 RAK-25REF RAK-35REF RAK-50REF MODEL RAK-15QEF RAK-18REF RAK-25REFC RAK-35REFC RAK-50REFC VALUE LABEL NAME tdf411_8u tdf412_8u tdf413_8u tdf411_cmp_8u 3000min-1 3000min-1 3000min-1 3000min-1 3000min-1 tdf412_cmp_8u 2200min-1 tdf413 defcmp_off_8u 120S defben_std_8u startdf1_8u startdf2_8u starcpd1_8u 3000min-1 3000min-1 3000min-1 3000min-1 2000min-1 starcpd2_8u 3000min-1 dfmax_std_8u 5500min-1 5500min-1...
  • Page 28 For the multi indoor unit RAK-25REF RAK-35REF RAK-50REF MODEL RAK-15QEF RAK-18REF RAK-25REFC RAK-35REFC RAK-50REFC LABEL NAME VALUE 4900min-1 4900min-1 4900min-1 4900min-1 4900min-1 WMAX_M 4900min-1 4900min-1 4900min-1 4900min-1 4900min-1 WMAX2_M 3500min-1 3500min-1 3500min-1 3500min-1 3500min-1 WSTD_M 4200min-1 4200min-1 4200min-1 4200min-1 4200min-1...
  • Page 29 +2.66 +1.33 +0.66 remote control -0.66 [fzontmc*-8u] Fan speed set to"aoto" Stop Stop Start Start Start/stop switch Thermo judgment Thermo off Ultra-hi indoor silent Ultra-Lo Operation lamp CMAX NOTE(5) NOTE(9) Rating compressor rotation start speed Outdoor fan reversing valve (heating "on" mode) Notes: (1) Condition for entering into Cool Dashed mode.
  • Page 30 Silent heating (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTC 2°C. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Pressing the "START/STOP"...
  • Page 31 Start Stop Start Stop Thermo-OFF Thermo-OFF Lo silent Ultra-Lo heating Notes: (1) If the room temperature is (cooling preset temperature) - (1.33°C) or less after 30 seconds from starting the operation, the operation is done assuming as the preset temperature = (room temperature at the time) - (2°C).
  • Page 32 (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTSD. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Pressing the "START/STOP" button and "POWERFUL"button during powerful operation wil cancel the powerful operation. (5) If the sleep timer is set during powerful operation, the powerful operation will be canceled.
  • Page 33 20 sec heating Notes: (1) Condition for entering into hot dashed mode. When fan set to "Hi" or "Auto" and i) room temperature is 18 or less, and ii) outdoor temperature is 10 or less, and iii) compressor speed (P section) due to temperature difference between setting temperature(including shift value only) and room temperature is WMAX or more.
  • Page 34 Setting Defrosting Inhibit Period DFTIM_OT P5 DFTIM_OTP 10 DFTIM_OT P0 Outdoor temperature – 1 0 – 5˚C ˚C Notes: The first inhibit time after operation start is set to DFTIM_FST. From the second time onwards, the inhibit time is set according to the time required for defrosting.
  • Page 35 Same as Basic Heating operation (1) Pressing the "POWERFUL" button will increase the temperature setting by PWSFTW. STARCPIL (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Defrost is inhibited for 20 minutes after the start of the powerful operation.
  • Page 36 Reversing valve defrosting ECO button 15' or more Auto fresh defrosting Over defrosting inhibit period Cooling:0.66 Dehumidifying:0.66 Fan speed Stop set to "Hi" Start/Stop button Set temperature Defrost signal Heating:0.66 Preheating released Preheating released Preheating judgment Preheating Indoor fan Current restrict Ultra-Lo Hi or Lo Outdoor fan...
  • Page 37 Frost wash Cooling、Heating、 Frost wash operation Dehumdify operation Defrosting period Fan period 1 Blance period Frost period Heating period 1 Stop period 1 Heating period 2 Stop period 2 Fan period 2 frzcl n_blnce_tm clntim_def1 clntim_suf1_frz1 clntim_wam1_frz1 clntim_stp1_frz1 clntim_wam2_frz1 clntim_stp2_frz1 clntim_suf2_frz1 ※1 (AUTO) frzcln_souf1_tm...
  • Page 38 MODEL RAK-15QEF,RAK-18/25/35REF,RAK-25/35REFC...
  • Page 39 MODEL RAK-50REF,RAK-50REFC...
  • Page 40 Procedure for Disassembly and Reassembly RAK-15QEF,RAK-18/25/35/50REF INDOOR UNIT RAK-25/35/50REFC (3)Pull the support hook at the upper side of the 1. Front Panel indication lamp of the indicating P.W.B. and pull Be sure to hold the front panel with both hands to out the P.W.B.
  • Page 41 (3)Pull fan motor out of the remove the right. Points for attention of fan motor and tangential air flow fan installation. When installing the flow fan,the first part of the fan and water seal plate on the tube plate overlap, then tighten the screw.
  • Page 42 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAK-15QEF,RAK-18/25/35/50REF,RAK-25/35/50REFC ・ ・ ・...
  • Page 43 2. Reset Circuit Reset R503 Microcomputer R502 IC501 Fig.2-1 Timing chart Voltage 5 . 0V pin of IC501 supply voltage RES detecting voltage RES canceling voltage 4 . 4V 4 . 2V Voltage pin of IC501 output voltage 5.0V pin of microcomputer Fig.2-2 Reset circuit is to initialize the indoor unit microcomputer when switching ON the power or after recovering from power failure.
  • Page 44 3. Drive circuit of the indoor fan motor Fig. 3-1 < The circuit check (For test) > < Pin 5 - Pin 3 voltage one example > Name Test point Test voltage 1300min - Motor drive power About 325V CN2 1 pin- 3 pin About 15V Motor contorl power CN2 4 pin- 3 pin...
  • Page 45 Caution The indoor fan motor and drive circuit are connected to the primary power supply. They therefore have voltage to ground. Guard against electric shocks. Caution While the product is energized, do not under any circumstances detach or reattach a connector. Any such practice would cause a high voltage to run, resulting in the indoor fan motor and board circuit being destroyed.
  • Page 46 Data of self-diagnosis mode is stored in IC531; data will not be erased even when power is turned off. Fig. 6-1 Initial Setting Circuit (IC531 and IC532) - For RAK -15QPE only (RAK-15QEF un se) When power is supplied, the microcomputer reads the data in IC531 and IC532 (E PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc.
  • Page 47 7. Temporary Switch Circuit MICROCOMPUTER Temporary switch R405 TEMPORARY SW SW211 Fig. 7-1 The temporary switch is used to operate the air conditioner temporarily when the wireless remote control is lost or faulty. The air conditioner operates in the previous mode at the previously set temperature. However, when the power switch is set to OFF, it starts automatic operation.
  • Page 48 DSW1...
  • Page 49 11. Indoor/outdoor communication circuits Indoor unit side Outdoor unit side Inverter circuit Outdoor C302 microcomputer Indoor transmission circuit Indoor microcomputer Outdoor Indoor/outdoor communication Outdoor reception chopper output (30kHz) reception circuit input Indoor transmission output Outdoor transmission circuit Outdoor transmission output Indoor reception input Indoor unit reception circuit Fig.
  • Page 50 12. Stepping motor drive circuit Microcomputer Vertical vane, left Vertical vane, left Vertical vane, left Vertical vane, left Horizontal sweep motor Lateral vane Lateral vane Lateral vane Lateral vane Vertical sweep motor Fig. 12-1 [Connector circuit waveform while the motor runs] Voltage waveforms of different phases as viewed from the OV line while the motor rotor is turning counterclockwise as viewed from the shaft side...
  • Page 51 (QEF/REF Unse) 13. Infrared human presence sensor circuit Sensor P.W.B Indoor main P.W,B Microcomputer Infrared sensor Fig.13 1 ・ With the infrared sensor,the air conditioner can detect the activity level in a room and adjust the temperature and humidity automatically,thus achieving the purpose of energy saving. ・...
  • Page 52 RL1 RL2...
  • Page 53 Load side is a high voltage line, please be careful from electric shock and install the Indica•on Lamp as near as possible to the Relay Kit. The maximum length of the wiring cable should be below 100m.
  • Page 54 SERVICE CALL Q&A MODEL RAK-15QEF,RAK-18/25/35/50REF,RAK-25/35/50REFC Cold air comes out during a To improve the dehumidification efficiency performs dehumidifying operation. quiet fan operation. Therefore the air is cold and it is not a malfunction. The operation does not stop even by...
  • Page 55 Common, etc. In fan speed "automatic" mode, In "automatic fan speed" mode, the This does not abnormal. It the product will sense the heat indoor fan changes from strong fan speed is because the cold fan exchange temperature and, to weak fan speed to slight fan speed. speed prevention is working.
  • Page 56 Wireless remote control I tried to change the setting with You cannot make this setting when the product is in "air the "room temperature" button of purification" mode. Moreover, you cannot set the product the remote control unit in vain. to a desired setting when quick laundry or dew control is being performed with the "auto"...
  • Page 57 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK-15QEF,RAK-18/25/35/50REF,RAK-25/35/50REFC FIXTURE SCREW ELECTRIC A L. COVER FIXTURE SCREW FIXTURE SCREW Removing electrical parts 1. Remove the electrical parts cover. 2. Remove the connectors from the CN4 (heat exchange thermistor), CN9、CN15 (stepping motor) , CN2 (fan motor) and CN21 (Eco sensor).
  • Page 58 Other instructions 1 Detaching and reattaching the receptacles for tab terminal All the receptacles for connecting tab terminals are with a locking mechanism. orcibly pulling any such receptacle without unlocking it will destroy it. Be on guard. When reconnecting it, insert it securely all the way home. ・Receptacle types and how to unlock them Mild resin cover Cancel button...
  • Page 59 Troubleshooting support unction Self-diagnosis display ・The failure mode detected on the indoor unit side is displayed by Display on the indoor blinking the "timer lamp". And a failure detected on the outdoor unit side unit side will be indicated by the "time lamp" blinking 4 times. ・If the outdoor unit side detects a failure, the product will first conduct several operation retrials.
  • Page 60 Self-diagnosis display function (indoor side display) While the "timer lamp" (orange), of the indoor unit is blinking, troubleshoot the product while referring to the table below. 1. How to count the lamp blinking frequency [An example of 5-time blinking] ・ The product will repeat blinking with 2-second 2-second 2-second intermissions.
  • Page 61 ERROR CODE INFO MATION <HOW TO DISPLAY ERROR CODE> 1. Set the remote to “OFF”. 2. Press (MODE) button on the remote control to set it to mode. 3. Press (TEMPERATURE) button of the remote control and set the room temperature on the remote control to 32℃. 4.
  • Page 62 Indoor interface circuit broken 1. Indoor interface circuit (sigle only) Outdoor interface circuit broken 1. Outdoor interface circuit (sigle only) and outdoor units sensor unit defective Short- circuit ECO sensor circuit Human SETTING THE PREVENTION OF MUTUAL INTERFERENCE a.) Other indoor circuit breakers should be disconnected. b.) Remore the back cover of the remote control.
  • Page 63 Forced cooling operation (Only single connection) The cooling operation can be forcibly performed for collecting refrigerant and inspecting failures. Do not perform the forced cooling operation continuously for long hours, because the compressor continues to be in operational status, regardless of room temperature. <How to start the operation>...
  • Page 64 3 and page 3 ON/OFF ON/OFF ON/OFF...
  • Page 65 DISPLAY OPERATION MODE SETTING ON/OFF...
  • Page 66 HOW TO CHANGE THE INTERMITTENT FAN CONTROL SETTING (POWERFUL) (FAN SPEED) (POWERFUL) (FAN SPEED) ∧...
  • Page 67 HOW TO CHANGE THE FAN SPEED IN COOLING MODE DURING THERMO OFF (POWERFUL) (ECO) Fan speed during thermo off Ultra low Set fan speed (When auto fan speed is set, the fan speed is low) NOTE :...
  • Page 68 Diagnosis and troubleshooting of indoor electric parts Initiating troubleshooting Are the "timer lamp" (orange) of the indoor unit Perform troubleshooting according to the blinking? self-diagnosis display. The product will begin to run in response to a remote control setting: "cooling mode, temperature setting 16 "...
  • Page 69 Checking the indoor unit electrical parts Introduction First check the failure phenomenon and status, and then move on to elaborate diagnosis. Initiating troubleshooting How many times does the time lamp Is the "timer lamp" (orange) of the indoor unit blinking? blinding not 4 times 4 times...
  • Page 70 1. Failure phenomenon: The power will not become turned on. Neither initialization, remote control, nor any other step works on the vane position at power-on. Situation Estimated cause of fuse blowout ・ Abnormally high voltage applied to the power supply [ Estimated failure ・...
  • Page 71 2.Failure phenomenon: The product will not receive a remote control signal. Situation The product does not receive a remote control signal. It is not very responsive. (The product does run normally in response to the emergency operation switch.) Estimated failure ・...
  • Page 72 How to identify sources of jamming in the reception of remote control signals [ Situation ] The product may become poorly responsive to remote control signals due to external factors even though the product itself is trouble-free. [ Estimating sources of jamming ] Identify the installation status of the air-conditioner and the indoor and outdoor environments to identify possible causes of the jamming.
  • Page 73 Effects of other Checking points electrical products ・Check the effects of light and power noises coming from other electrical products. ・Turn on and off the electrical products, turn off the power and turn on the power, and check their effects on the reception of remote control signals.
  • Page 74 3. Failure phenomenon: The compressor will not run. [ Situation ] The compressor will not run (the same state as the thermometer turned off), the product receives remote control signals normally. The self-diagnosis lamp (LD301) of the outdoor unit blinks once or becomes turned off. [ Estimated failure locations ] ・Room temperature thermistor, heat exchanger thermistor Microcomputer peripheral circuit ・...
  • Page 75 4. Failure phenomenon: The fan motor will not stop. Situation I have conducted the stop operation on the product by remote control, but the indoor fan motor will not stop. (It stopped about 10 minutes later.) Estimated failure locations ・Indoor fan motor ・Fan motor drive circuit Diagnosis flow Initiating troubleshooting...
  • Page 76 5. Timer lamp blinking: blinking once [Situation] The timer lamp blinks one time and the product will not operate. (This is not a sign of a breakdown.) [Estimated failure locations] ・ Reversing valve defective. ・ The refrigerating cycle block gas leak. 6.
  • Page 77 9. Timer lamp blinking: blinking 9 times [Situation] The timer lamp blinks 9 times and the product will not run. [Estimated failure location] Loose connector, wire break, or short-circuit in the room temperature thermistor, heat exchanger thermistor. [Cautions] Starting the product by remote control will initiate failure detection. (Merely turning on the power will not activate the failure detection function.) [Diagnosis flow] Initiating troubleshooting...
  • Page 78 10. Timer lamp blinking: blinking 10 times [Situation] The timer lamp blinks 10 times and the product will not run. [Estimated failure locations] ・Loose connector or wire break in the indoor fan motor ・ Indoor fan motor mechanically locked ・ ・Indoor fan motor ・Indoor fan motor drive circuit [Diagnosis flow]...
  • Page 79 11. Timer lamp blinking: blinking 12 times [Situation] The timer blinks 12 times and the product will not run. [Estimated failure locations] Erroneous connection in the indoor-outdoor connection line (F cable) Forget to connect CN27of outdoor P.W.B Wire break or poor insertion of the indoor-outdoor connection line (F cable) Electrical parts in the outdoor unit (communication circuit, power circuit error) Communication error due to noise in other home electronics This does not constitute a failure in the air-conditioner...
  • Page 80 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAK-15QEF RAK-18/25/35/50REF RAK-25/35/50REFC...
  • Page 81 INDOOR UNIT HHAW PARTS NO Q'TY/ PARTS NAME UNIT RAK-15QEF RAK-18REF RAK-25REF RAK-25REFC RAK-35REF RAK-35REFC RAK-50REF RAK-50REFC CABINET ASS'Y HWRAK-18REF VERTICAL AIR DEFLECTOR HWRAK-18PED FAN MOTOR HWRAK-18REF HWRAK-18PSPA 902 TANGENTIAL AIR FLOW FAN HWRAK-18PED FAN SUPPORT ASS'Y HWRAK-18PED FAN MOTOR SUPPORT-R...
  • Page 82 JCH-WH NO.0131E RAK-15QEF RAK-50REF RAK-18REF RAK-25REFC RAK-25REF RAK-35REFC RAK-35REF RAK-50REFC...