Husqvarna Automower 420 Technical Manual

Husqvarna Automower 420 Technical Manual

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Summary of Contents for Husqvarna Automower 420

  • Page 1 TECH N ICA L M A N UA L HUSQVARNA AUTOMOWER ® 420/430X/450X...
  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1 Function 5.25 Replacing the circuit board, charging station 1.1 Husqvarna Automower 420, 430X and 450X, what's what? 5 5.26 Replacing the contact strips, charging station ® 1.2 Introduction 5.27 Assembling the sealing strip 1.3 Technical data 5.28 Mounting screws...
  • Page 4 420, 430X and 450X Edition m/2016. ® The Technical Manual for the Husqvarna Automower® 420, 430X and 450X is a supplement to the Operator's Manual. The manual contains in-depth information about the robotic lawnmower and its peripheral equipment. The Technical Manual is intended for dealers, service personnel, etc.
  • Page 5: Function

    1. FUNCTION 1 Function 1.1 Husqvarna Automower 420, 430X and 450X, what's what? ® Automower 420 Automower 430X Automower 450X The numbers in the picture correspond to: Body 18. Chassis box with electronics, battery and motors Cover for display and keypad.
  • Page 6: Introduction

    1. FUNCTION 1.2 Introduction This Technical Manual contains important information about the Husqvarna Automower 420 430X and 450X ® and their function, how to install them and a number of installation examples. It also contains information about special menu functions available for the mower, the Autocheck Experience service program, repair instructions and troubleshooting.
  • Page 7: Technical Data

    1-3 dB(A). Noise emission declarations agree with EN 50636-2-107:2015 Husqvarna AB does not guarantee full compatibility between the robotic lawnmower and other types of wireless systems such as remote controls, radio transmitters, hearing loops, underground electric animal fencing or similar.
  • Page 8: Software

    Quick Check and return to the main menu. It is important that the robotic lawnmower is programmed with the latest software versions. Husqvarna is continuously improving the mower’s behavior and performance, which results in new software versions. English - 8...
  • Page 9: Cutting Technique

    There are many different types of blades and they are sold in various package sizes. Use only approved original blades from Husqvarna. From the start of 2011 these are marked with a Husqvarna symbol. English - 9...
  • Page 10 1. FUNCTION 1.5.3 Irregular mowing pattern The robotic lawnmower mows the lawn in an irregular pattern. This gives a very even mowing result. In ad- dition, there are no distinctive tracks left in the lawn, which is often the case when using a conventional lawn mower.
  • Page 11: The Loop System's Control Signals

    1. FUNCTION 1.6 The loop system’s control signals The loop system consists of a boundary wire and guide wires connected to the charging station. To- gether they essentially comprise 4 different signals: • A signal • F signal • N signal •...
  • Page 12: Loop System Status

    1. FUNCTION The Automower® cannot enter the charging station when there is no N signal. The mower will eventually stop and display the Low battery fault message. • Guide signal The signal that the charging station transmits through the guide wires. The guide signals lead the mower to the charging station, but can also be used to direct the mower to a remote area.
  • Page 13 1. FUNCTION The strength of the loop signal varies depending on the distance to the wire. The strength of the signal is high right next to the wire. The strength subsequently diminishes the farther away from the wire you get. The Signal quality reading determines whether the signal from the boundary wire is strong enough for the mower to be in working order.
  • Page 14: Guide Wire

    1. FUNCTION 1.9 Guide wire The guide wire, together with the part of the bounda- ry wire that comprises the return to the charging sta- tion, is called the guide wire. The current in the guide loop always goes from the guide wire to the left in the connection between guide wire and boundary wire.
  • Page 15 1. FUNCTION The Automower® always starts a search for the charging station using the Irregular method, on the condition that the delay times for the boundary wire or any of the guide wires are not set to 0 minutes. Irregular searching means that the Automower® runs in an irregular pattern until it encounters the F field near the charging station.
  • Page 16: Automatic Detection Of Passages

    1. FUNCTION 1.11 Automatic detection of passages When the robotic lawnmower follows a guide wire it does so at a maximum distance defined by the cor- ridor width setting (Installation - Advanced - Corridor width). The distance is randomly varied from one search to another to reduce the risk of tracks forming.
  • Page 17: Sensors

    1. FUNCTION 1.14 Sensors There are several types of sensors in the mower. The front collision sensor (1), rear collision sensor (2), tilt sensor (3) and lift sensors (4) have the task of protect- ing both mower and user. The rear (5) and front (6) loop sensors are used to control the mower within the working area, to position the mower when docking, tracking the guide wire, etc.
  • Page 18: Special Menu Functions

    2. SPECIAL MENU FUNCTIONS 2 Special menu functions 2.1 Quick Info Quick Info is a display mode where you can quickly see information about program versions, battery, loop signals, sensors and operating history. When the start page or the main menu is displayed: Press and hold down the 0 key for 2 seconds to ac- cess the Quick Info function.
  • Page 19 2. SPECIAL MENU FUNCTIONS • COM: Version of program on communication board (Automower® Connect) • U.SONIC: Version of program for the ultrasonic sensors. The Info - General - Prod. display mode shows: • Total running time: The total number of Prod.
  • Page 20 2. SPECIAL MENU FUNCTIONS The Info - Loop - A signal display mode shows the loop signal from the boundary wire measured through the loop sensors in the mower. The value A-loop G, F, N Quality should lie between approximately 40 and 160 to ensure good functionality.
  • Page 21 2. SPECIAL MENU FUNCTIONS • Tilted X and Tilted Y: When the robotic lawnmower is standing horizontally, the value should be max ±3%. Inclination up and to the left give negative values. Status Temp • Normal position: YES indicates that the mower is standing in a normal position and NO indicates that the mower is upside down.
  • Page 22 Data not transmitted (may be due to problem with SIM card). Automower Connect is attempting to transmit data but the Husqvarna server is not receiving. This can be caused by the fact that the money has finished if using a cash SIM card.
  • Page 23 2. SPECIAL MENU FUNCTIONS The By frequency display mode show for each mes- sage: • Position in the message list. The faults are sorted according to frequency with the most frequent at the top • Message title • The number of times this fault has occurred since the latest fault message reset The History - Messages - Info messages display mode shows the last 50 messages that the mower has reg-...
  • Page 24 2. SPECIAL MENU FUNCTIONS In Advanced – Installation shape mode, the selected installation shape is shown: The robotic lawnmower can be set to one of three garden shapes: Open, Normal and Complex. This setting affects how the robotic lawnmower covers a working area when it mows.
  • Page 25: Discover The Pin Code

    2. SPECIAL MENU FUNCTIONS 2.2 Discover the PIN code If the PIN code for the robotic lawnmower is forgot- PIN code ten, the right code can be found. In the input mode for PIN code, or when the main menu is displayed: Hold down the 9 key for five seconds and a combination of Security code: MEPI DYHJ IIGF twelve letters and the mower’s serial number will then...
  • Page 26: Main Menu, An Overview

    2. SPECIAL MENU FUNCTIONS 2.4 Main menu, an overview English - 26...
  • Page 27: Tool Menu, An Overview

    2. SPECIAL MENU FUNCTIONS 2.5 Tool menu, an overview English - 27...
  • Page 28: Tool Menu, Functions

    2. SPECIAL MENU FUNCTIONS 2.6 Tool menu, functions Via the Tools menu, you can access data about the mower’s function, test functions and special settings. • Info Information about current status of software, sensors, battery, loop signal, etc. • History, total Key data, which gives an overview of a mower’s age and function.
  • Page 29 2. SPECIAL MENU FUNCTIONS The Info - Motors - Cutting height menu shows: • Cutting height: The cutting height motor's height setting measured in steps. • Current: Nominal power consumption, measured in mA. The Info - GPS navigation menu shows: •...
  • Page 30 2. SPECIAL MENU FUNCTIONS • Complete chargings (no.) Counts the number of full recharges. A complete charging is defined as a charging that has proceeded for more than 20 minutes and that has been terminated as the charge current is less than 0.3 A. Search times Information about how long a search for the charg- ing station has taken.
  • Page 31 2. SPECIAL MENU FUNCTIONS 2.6.3 History, trip History, trip contains the same information as History - Key data Info Key data above. The difference is that in History, trip, it is possible to clear all values, just like a trip meter in a car.
  • Page 32 2. SPECIAL MENU FUNCTIONS ! If you have to help the wheel to go round by hand in order to get the wheel motor started and if the wheel motor stops as soon as the wheel is blocked, the fault lies in the main circuit board and not in the wheel motor.
  • Page 33 2. SPECIAL MENU FUNCTIONS Sounds Place the cursor on Start and press OK. The buzzer then emits a short sound signal at the same time as a note is shown on the display. Press BACK to exit the test. Charging station This function is used to quickly check that there is a signal for A, F, N and the Guide wires.
  • Page 34 2. SPECIAL MENU FUNCTIONS 2.6.5 Special settings The Special settings sub-menu contains the settings Override loop detection Info that are only accessible to dealers. Demo mode History, total Override loop detection This function makes it possible to temporarily switch Installation settings lock History, trip off a mower’s loop detection, i.e.
  • Page 35: Installation

    3. INSTALLATION 3 Installation 3.1 Charging station The placement of the charging station should be well planned in order to give the best installation and operation of the robotic lawnmower. See also 3.2 Installation of the charging station in the Operator's Manual.
  • Page 36: Boundary Wire

    3. INSTALLATION • Do not, under any circumstances, mount the power supply at a height where there is a risk it can be submerged in water (at least 30 cm from the ground). It is not permitted to place the power supply on the ground.
  • Page 37 3. INSTALLATION Obstacles Obstacles are demarcated by routing the boundary wire from the outer edge of the working area in to- wards the object, around it and then back along the same path under the same pegs. The distance be- tween the wires on the return route must be as small as possible.
  • Page 38: Guide Wire

    3. INSTALLATION 3.3 Guide wire See also 3.6 Installation of guide wire in the Operator's Manual. 3.3.1 Installation of the guide wire • The position of the charging station and where the guide wire is connected along the boundary wire has an impact on how long the guide loop will be.
  • Page 39: Testing The Installation

    3. INSTALLATION 3.4 Testing the installation As a part of the installation, selected settings for the installation must be tested. The test is carried out with Test in the Lawn coverage and Find charging station menus. It is recommended to turn off the ECO mode func- tion before carrying out these tests.
  • Page 40: Calibrate Guide

    3. INSTALLATION Measure the distance to a remote area Place the mower in the charging station. Enter a distance in Installation - Lawn coverage - Area 1, 2 or 3 - How far? that definitely exceeds the distance to the position along the guide wire or boundary wire you wish to measure, e.g.
  • Page 41: One Robotic Lawnmower For Several Working Areas

    3. INSTALLATION 3.6 One robotic lawnmower for several working areas The unique coupling between mower and charg- ing station is saved in the profiles. This allows up to 3 different charging stations to be coupled to the same robotic lawnmower. Coupling a new charging station to the robotic lawn- mower: •...
  • Page 42: Weather Timer

    3. INSTALLATION When the mower leaves the charging station it search- es for the area that has been least mown. This means that the settings made in Lawn coverage are then not used by the mower. The automatic settings made by the robotic lawnmower cannot be read in the display.
  • Page 43: Safe Operation On Slopes

    It does not affect the loop signal in any way, which the PIN code in Husqvarna G2 models does. In rare cases, there may be a reason to change the...
  • Page 44: Autocheck Experience, Service Program

    The robotic lawnmower is connected to the computer using a service cable. There are 2 different cables: • USB cable with service connector of a standard USB type for Husqvarna G3 models (e.g. Automower® 420, 430X and 450X). • USB cable with a special type of service connector for Husqvarna Automower®...
  • Page 45: Installation And Login

    4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM 4.1 Installation and login Autocheck EXP can only be installed on PC computers. The program has been developed and tested for the following operating systems: Windows XP, Windows Vista (32 and 64 bits), Windows 7 (32 and 64 bits) and Windows 8 (32 and 64 bits).
  • Page 46: Connection To The Robotic Lawnmower

    4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM 4.2 Connection to the robotic lawnmower Connect the service cable between your computer and the robotic lawnmower: • Remove the protective cover for the battery on the bottom of the mower. The service outlet is located beside the main switch.
  • Page 47: Use

    4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM 4.3 Use Autocheck EXP has been designed to be as self-instructional as possible. There are a lot of help texts and il- lustrations in the program to guide the user. The program’s main functions are grouped in a number of menus that are accessed via buttons in a list in the upper part of the program.
  • Page 48 4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM 4.3.1 Auto test In Auto test, a comprehensive test of the components in the robotic lawnmower is carried out. The test is semi-automatic, which means each component is started and stopped by the service program. Auto test is a suitable function to use for an overall review of the components, for example, in connection with winter ser- vice or to start troubleshooting.
  • Page 49 4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM 4.3.2 Manual test Every component in the robotic lawnmower can be tested in the manual test. The function consists of 4 parts: • Power/Motors • User interface • Sensors • Loop When using Manual test unlike Auto test, you have to start and stop the components you wish to test yourself.
  • Page 50 4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM Different main circuit boards in the mower and ad- ditional equipment determine which software is used. Autocheck EXP itself checks which software is suit- able for the connected mower. At times, there may be a need to answer questions to supplement the inspection.
  • Page 51 4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM Programming new main circuit board If the main circuit board is replaced, the new main circuit board must be programmed. The main circuit board includes for instance information about the robotic lawnmower's serial number. A new main circuit board may for safety reasons be only assigned one serial number which is never changed.
  • Page 52 4. AUTOCHECK EXPERIENCE, SERVICE PROGRAM It is recommended to use the log book throughout the robotic lawnmower's lifecycle (at the time of a sale, winter service, repairs) to obtain a good over- view of the mowers that have been sold or serviced. It is then easy to see how far a mower has traveled since the last service, how well it has been working, what parts have been replaced at each service, if...
  • Page 53 There is a complete collection of documents for robotic lawnmowers from Husqvarna, with models from 2003 and later. Current service plans for many mower mod- els are also here. Documents marked in red are newly added and unopened documents. On the right of the document tab is a preview of the first page of the selected document.
  • Page 54: Repair Instructions

    5. REPAIR INSTRUCTIONS 5 Repair instructions All repairs to robotic lawnmowers should be done in- doors on a clean work bench to protect sensitive compo- nents from moisture and dirt. All screws in the robotic lawnmower must be fitted using the correct tightening torque according to Table 3: Screw Fasteners on page 82.
  • Page 55: Design And Function

    5. REPAIR INSTRUCTIONS 5.1 Design and function 5.1.1 Chassis and body The robotic lawnmower is structured mechanically around the following major components: • Body • Top cover (450X) • Display cover • Chassis, upper section • Chassis, lower section There are 2 sealing strips, one between the upper and lower sections of the chassis, plus one between the upper section of the chassis and the display cov- er.
  • Page 56 5. REPAIR INSTRUCTIONS 5.1.3 Sensors The robotic lawnmower is equipped with the follow- ing sensors: • Front collision sensor (1) • Rear collision sensor (2) • Tilt sensor (3) • Lift sensors (4) • Rear loop sensors (5) • Front loop sensors (6) •...
  • Page 57 The battery is specially adapted to minimize dis- turbance to the loop sensors and is equipped with additional overload protection. Use only original batteries from Husqvarna. The battery must not be mixed up with similar batteries used for instance with other GARDENA lawn care products.
  • Page 58 5. REPAIR INSTRUCTIONS 5.1.7 Cutting motor The blade motor is a very efficient brushless motor. The nominal speed is 2,300 rpm to achieve the opti- mal mowing result. The motor cannot be repaired and has to be re- placed if it is faulty. 5.1.8 Wheel motors The 2 wheel motors are of the brushless DC motor type.
  • Page 59: Dismantling And Assembling The Robotic Lawnmower

    5. REPAIR INSTRUCTIONS 5.2 Dismantling and assembling the robotic lawnmower IMPORTANT INFORMATION Clean any grass and dirt from the robotic lawnmower before you begin disassembling. 5.2.1 Dismantling the body The body is fitted to the chassis using 4 quick- mounted, snap-on brackets. The charging cable fastened to the body's charging strip must be dis- connected to be able to remove the body entirely from the chassis.
  • Page 60 5. REPAIR INSTRUCTIONS Disconnect the HMI cable from the main circuit board and remove the upper section of the chassis. 5.2.3 Dismantling the display cover The display cover is mounted on the chassis with 4 screws. To enable the parts to be fully separated, all cabling between the HMI circuit board and the upper section of the chassis must be disassembled from the HMI circuit board.
  • Page 61 220AC and 305, which have a 4 millimeter strip. IMPORTANT INFORMATION A 5 mm sealing strip must be used on Automower 420/430X/450X. Sealing may be deficient if the wrong sealing strip is used, leading to costly repair work. English - 61...
  • Page 62 5. REPAIR INSTRUCTIONS The sealing strip can be laid both clockwise and coun- ter-clockwise. Refer to 5.27 Assembling the sealing strip on page 79. Fit the HMI cable from the chassis' upper section to the main circuit board. Fit the chassis' upper section to the lower section.
  • Page 63: Dismantling The Charging Station

    5. REPAIR INSTRUCTIONS 5.3 Dismantling the charging station Replacing the antenna plate in the charging station also requires that the charging tower is detached from the charging station (see points 6 and 7 be- low). To replace e.g. a circuit board or a contact strip, it is sufficient to remove the cover from the charging station.
  • Page 64: Changing The Top Cover (450X)

    5. REPAIR INSTRUCTIONS 5.5 Changing the top cover (450X) Dismantle the body, see 5.2.1 Dismantling the body on page 59. Unscrew the 8 screws (Torx 20) from the underside of the body. Carefully snap the top cover loose from the body. Snap on the new top cover.
  • Page 65: Replacing The Battery

    Disconnect the battery connection from the main circuit board. Dismantle the battery holder and remove the battery. Fit a new original battery from Husqvarna and connect it to the main circuit board. Assemble the mower in the reverse order for disassembly.
  • Page 66: Replacing The Hmi Board

    5. REPAIR INSTRUCTIONS Connect the mower to Autocheck EXP and select Programming. The service program will then ask for the mower's serial number. Select the correct serial number in the log book. Autocheck EXP now automatically transfers the operating information saved in step 1.
  • Page 67: Replacing The Gps Board/Automower Connect Board

    5. REPAIR INSTRUCTIONS IMPORTANT INFORMATION Only touch the edges of the circuit board. Never touch the board’s components and pin terminals. Reconnect all cables to the HMI circuit board. Refit the display cover, chassis and body. 10. Put the main switch in position 1 and connect the mower to Autocheck to program the HMI circuit board.
  • Page 68: Replacing The Keypad

    5. REPAIR INSTRUCTIONS 5.11 Replacing the keypad Dismantle the body, see 5.2.1 Dismantling the body on page 59. Dismantle the chassis, see 5.2.2 Dismantling the chassis on page 59. Dismantle the display cover, see 5.2.3 Dismantling the display cover on page 60.
  • Page 69: Changing The Ultrasound Sensors (450X)

    5. REPAIR INSTRUCTIONS 5.12 Changing the ultrasound sensors (450X) Dismantle the body, see 5.2.1 Dismantling the body on page 59. Dismantle the top cover, see 5.5 Changing the top cover (450X) on page 64. Unsnap the ultrasonic sensors from underneath the body. Release the cabling to the sensors from the body.
  • Page 70: Replacing The Buzzer

    5. REPAIR INSTRUCTIONS 5.15 Replacing the buzzer Dismantle the body, see 5.2.1 Dismantling the body on page 59. Dismantle the chassis, see 5.2.2 Dismantling the chassis on page 59. Loosen the 2 screws (Torx 20) holding the buzzer in position. Disconnect the buzzer connectors from the HMI circuit board and remove the buzzer from the chassis.
  • Page 71: Cleaning Or Replacing The Ventilation Filter

    5. REPAIR INSTRUCTIONS 5.17 Cleaning or replacing the ventilation filter Dismantle the body. Refer to 5.2.1 Dismantling the body on page 59 Dismantle the front display cover by pulling up the cover firmly. Dismantle the front display cover bracket by unscrewing the 3 screws with the display cover closed.
  • Page 72: Replacing The Sensors

    5. REPAIR INSTRUCTIONS 5.18 Replacing the sensors 5.18.1 Front loop sensors The front loop sensors are mounted on the front sensor circuit board. The sensors cannot be re- placed separately. The entire front sensor circuit board must be replaced as a unit. Dismantle the body, see 5.2.1 Dismantling the body on page 59.
  • Page 73 5. REPAIR INSTRUCTIONS Disconnect the cable from the lift sensor circuit board. Note: Always pull the connector and NOT the cable. Remove the lift sensor circuit board by carefully bending up the snap-on fasteners and lifting out the sensor circuit board. Unscrew the 2 screws (Torx 20) which secure the holders for the front sensor circuit boards.
  • Page 74: Replacing The Blade Motor

    5. REPAIR INSTRUCTIONS Disconnect the cable from the collision sensor circuit board. Note: Always pull the connector and NOT the cable. Remove the collision sensor circuit board by carefully bending up the snap-on fasteners and lifting out the sensor circuit board. Fit the new sensor circuit board and reconnect the cable.
  • Page 75: Replacing The Wheel Motor

    5. REPAIR INSTRUCTIONS 5.20 Replacing the wheel motor Dismantle the body, see 5.2.1 Dismantling the body on page 59. Dismantle the chassis, see 5.2.2 Dismantling the chassis on page 59. Disconnect the cable for the wheel motor from the main circuit board and disconnect the cable from the cable brackets in the lower chassis section.
  • Page 76: Replacing The Rear Collision Columns

    5. REPAIR INSTRUCTIONS Unscrew the 4 screws (Torx 20) securing the cover to the cutting height adjustment. Disassemble the cover with the motor from the chassis. Remove the cogwheel from the motor. Loosen the 3 screws (Torx 25) securing the motor in the cover.
  • Page 77 5. REPAIR INSTRUCTIONS Unscrew the 3 screws (Torx 20) securing the front collision brackets to the chassis. Loosen the 3 screws securing the bracket to the collision column. Depending on which part of the collision column bracket is to be replaced, a varying amount of disassembly is required.
  • Page 78: Changing And Regreasing Lower Front Wheel Bearing

    5. REPAIR INSTRUCTIONS 5.24 Changing and regreasing lower front wheel bearing Dismantle the body, see 5.2.1 Dismantling the body on page 59. Dismantle the front wheel by loosening the 3 screws on the side of the wheel and then splitting the wheel. Remove the lock washer from the axle.
  • Page 79: Replacing The Contact Strips, Charging Station

    5. REPAIR INSTRUCTIONS 5.26 Replacing the contact strips, charging station When the mower’s battery does not recharge or the mower cannot contact the charging station, this may be due to worn contact strips in the charging station. The contact strips should be replaced when black- ened or oxidized.
  • Page 80: Mounting Screws

    5. REPAIR INSTRUCTIONS Alternative 2 - Counter-clockwise Start by laying one end of the sealing strip in line with the marking on the chassis. Continue laying the sealing strip counter-clockwise around the chassis half. Lay the other end of the sealing strip above the first end and then out of the channel.
  • Page 81: Mounting Thread Plugs

    5. REPAIR INSTRUCTIONS 5.29 Mounting thread plugs If the threads in plastic parts are worn, thread plugs can be inserted. A repair kit containing thread plugs and suitable metal screws is available to order, refer to the current spare parts list for the part number. Since the diameter of the screw tower for the chas- sis is not adapted for the use of thread plugs, great care must be taken when assembling the plugs.
  • Page 82: Screw Fasteners

    5. REPAIR INSTRUCTIONS 5.30 Screw fasteners All screws are made from stainless material or rustproofed with zinc plating. Article numbers are to be found in the separate Spare Parts List. Table 3: Screw Fasteners Fastener Hardware Tools Tightening torque (Nm) Circuit board holder Screw, gray 4 x 14 mm Torx 20...
  • Page 83: Troubleshooting

    6. TROUBLESHOOTING 6 Troubleshooting The troubleshooting section consists of 2 main areas: Messages Symptom Each message and symptom is explained using one or more possible causes of the problem, followed by one or more solutions. First go through the basic and installation-related possible causes described in the following sections in this chapter.
  • Page 84: Messages

    420. 58/59 Temporary battery Wrong type of battery. Use only original batteries from problem Husqvarna. (58 indicates battery A, 59 battery B) 60/61 Temporary battery Battery temp sensor defective. Change battery. Refer to 5.7 Replac- problem ing the battery on page 65. (60 indi- cates battery A, 61 battery B) Wrong type of battery.
  • Page 85 6. TROUBLESHOOTING Motors 20/21 Wheel motor blocked, Grass or other object has Check the drive wheel and remove right/left wrapped around the drive any objects. wheel. 22/23 Wheel motor problem, The wheel motor is faulty Check the wheel motors’ function right/left when idling.
  • Page 86 6. TROUBLESHOOTING Installation No loop signal Boundary wire broken. Check the signal given by the LED on the charging station. Refer to 6.4 Troubleshooting the loop signal on page 95. Power supply not connected. Check the wall socket connection and whether an earth-fault breaker has trip- ped.
  • Page 87 6. TROUBLESHOOTING Trapped The robotic lawnmower has Free the the robotic lawnmower and got caught in something. rectify the reason for it becoming trap- ped. The robotic lawnmower is Check if there are any obstacles stuck behind a number of ob- which make it hard for the robotic stacles.
  • Page 88 6. TROUBLESHOOTING Internal diagnostics 18/19 Collision sensor prob- The mower has become stuck. Free the robotic lawnmower and rec- lem rear/front tify the reason for it getting stuck. The body can not move freely Make sure the body can move freely around the chassis.
  • Page 89 6. TROUBLESHOOTING Weak GPS signal Not applicable for If the message appears often, turn Automower® 420. The GPS off the GPS assisted navigation and signal is weak for the current instead use the manual settings for working area. GPS assisted Lawn coverage, see Installation on navigation cannot be used.
  • Page 90 Therefore, it is not possible, for instance, to use an HMI circuit board in a Husqvarna 420 if it has previously been fitted to a 430. Charging station An object is obstructing the Remove the object.
  • Page 91: Symptom

    6. TROUBLESHOOTING 6.2 Symptom The most commonly occurring symptoms are described below. All symptoms are grouped by the situation where they occur most often. Cutting Searching Following the guide wire Docking Charging Others 6.2.1 Symptoms during mowing Table 5: Symptoms during mowing Symptom Cause Action...
  • Page 92 6. TROUBLESHOOTING The robotic lawnmower The wheel motor’s gearbox is Check the wheel motor function when idling travels in a small circle or slipping. via the Tools menu or use Autocheck EXP. one wheel locks up when The battery voltage should be more than turning instead of rotating 18 V in this test.
  • Page 93 6. TROUBLESHOOTING 6.2.3 Symptoms during docking Table 7: Symptoms during docking Symptom Cause Action The robotic Dirt/leaves/grass have Clean the charging station. lawnmower detects accumulated in the charging the F signal, but station and are preventing the cannot dock mower’s charging strip from making contact with the charging station’s charging strip.
  • Page 94 6. TROUBLESHOOTING 6. TROUBLESHOOTING 6.2.4 Symptoms during charging Table 8: Symptoms during charging Symptom Cause Action Both the mowing and Impaired battery capacity. Perform a battery test to determine the charging times are battery's capacity. Refer to 6.6 Battery test shorter than usual on page 98.
  • Page 95: Loop Signal

    6. TROUBLESHOOTING 6. TROUBLESHOOTING 6.3 Loop signal When measuring loop signal strength, the mower should be placed in the charging station. Use the Tools - Test - Charging station menu function to check that the signal strength is within the expected values. The test provides a quick answer to if the charging station generates all signals and the mower can detect these signals.
  • Page 96 6. TROUBLESHOOTING 6.4.3 Blue flash Most likely a break in the boundary wire. Measure the resistance in the boundary wire using a multim- eter. Disconnect all cables from the charging station during measuring. The resistance value for a non- faulty boundary wire should be between 0-20 Ohm. •...
  • Page 97: Finding A Break In The Boundary Wire

    1-2 steps at a time every week until the desired cutting height has been reached. A wire break can be found by using Husqvarna’s break detection tool or with the manual method that is de- scribed below.
  • Page 98: Battery Test

    The damaged section can be cut out if it is possible to shorten the boundary wire. Use only original couplers from Husqvarna. 6.6 Battery test If the mower's battery starts to perform poorly, the robotic lawnmower will mow for shorter time peri- ods.
  • Page 99 6. TROUBLESHOOTING Allow the robotic lawnmower to mow in manual operating mode until the battery is completely flat. The mower should have a low level of cutting resistance during the battery test. The cutting height should therefore be set to maximum. When the battery has run down the mower stops.
  • Page 100: Maintenance And Service

    7. MAINTENANCE AND SERVICE 7 Maintenance and service 7.1 Cleaning Clean the body, display cover and chassis regu- larly. The best way to clean the body is with a damp sponge or cloth. The underside of the body, wheels and blade disc are best cleaned with a brush (for example, a washing-up brush).
  • Page 101: Service Schedule

    Husqvarna. 7.3 Service schedule The table below contains a checklist of points and actions to be taken when servicing the mower. Some of the points must be carried out every three years while others must be done every year.
  • Page 102 7. MAINTENANCE AND SERVICE Check tightening torque Refer to 5.2.5 Assembling the chassis, of chassis screws. 5.22 Replacing the rear collision columns and 5.23 Replacing front collision column/ lift sensor for screw locations and 5.30 Screw fasteners for correct tightening torque. Check chassis wire Check all rubber seals leading into the bushings.
  • Page 104 AUTOMOWER is a trademark owned by Husqvarna AB. Copyright © 2016 HUSQVARNA. All rights reserved. 115 81 90-26...

This manual is also suitable for:

Automower 430xAutomower 450x

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