Brand: Husqvarna
Category: Lawn Mower
Document Type: Manual
Language: EN
Manual for Rider 16C AWD, Rider 18 AWD, Rider 15T/s AWD
Uploaded: Nov. 21, 2025, 6:39 p.m.
This manual provides comprehensive instructions for the repair and service of Husqvarna Rider lawn mowers, specifically models 16C AWD, 18 AWD, and 15T/s AWD. It covers safety instructions, special tools required, detailed specifications for each model, and a step-by-step guide for delivery and dealer service.
The manual also includes a service schedule, detailing maintenance intervals and procedures. Furthermore, it offers extensive troubleshooting guides for common issues such as the engine not starting, running unsatisfactorily, or the machine experiencing low power or vibrations. Hydraulic system maintenance and hose bundle procedures are also elaborated upon.
Troubleshooting and error codes
| Problem | Possible Cause | Solution |
|---|---|---|
| The engine will not start | Discharged battery | Charge the battery |
| Serious engine damage | Repair / Replace the engine | |
| Start relay no contact | Change the relay | |
| Starter motor and/or cable connection defective | Check the connections. Change the starter motor | |
| Extremely burnt electrodes. | Adjust electrode gap or replace spark plug | |
| Defective connection to ignition cable | Replace the spark plug guard | |
| Short circuited/flooded spark plug | Replace the spark plug | |
| Spark plug electrode defective | Check the cable connections or replace the switch | |
| Fuel tank empty | Fill with fuel | |
| Fuel stop valve does not open | No current to the valve / the solenoid is defective | |
| No fuel to carburettor | Fuel filter clogged | |
| No fuel from the carburettor. (Spark plug dry) | Fuel pump does not work | |
| Spark plug not sparking | Poor contacts on the battery terminals | Clean and lubricate with copper paste |
| Blown fuse | Change the fuse. Localise the fault | |
| Poor/no earth contact | Clean and lubricate with copper paste | |
| Broken ignition lock | Check the cable connections or replace the switch. Adjust setting | |
| Microswitch on the cutting unit's lifting lever is defective or in wrong position | Check the cable connections or replace the switch. Adjust setting | |
| Microswitch under the seat defective | Check the cable connections or replace the switch. Adjust setting | |
| Microswitch pedal arrangement defective | Check the cable connections or replace the switch. Adjust setting | |
| Faulty fuel supply | Fuel filter clogged | Clean or replace the fuel cap |
| Tank ventilator blocked | Clean or replace the fuel cap | |
| Fuel pump does not work | Pump diaphragm faulty | |
| Fuel hoses blocked or constricted | Impulse channel blocked | |
| Needles and diffuser jets blocked | Clean the carburettor with compressed air | |
| Engine runs unevenly or feels weak | Ignition fault | Spark plug defective |
| Ignition setting incorrect | ||
| Faulty ignition module / sensor | ||
| Incorrect pre-ignition position | ||
| Exhaust system fault | Abnormal exhaust noise? Replace the muffler | |
| Fuel fault | Incorrect fuel type | |
| Fuel too old | ||
| Low octane value after long period of storage Replace the petrol | ||
| Choking | Check choke cable and choke valve | |
| Overloading | Change driving style | |
| Carburetor problems | Blocked needles | |
| Clean or replace the fuel pipe | ||
| Incorrect settings | ||
| Clean the carburettor with compressed air | ||
| Insufficient cooling | Blocked cooling fins or air intake | |
| Cooling fan damaged | ||
| Engine starts but does not run satisfactorily | Spark plug defective | Clean, adjust or replace the spark plug |
| Replace with spark plug with right thermal value | ||
| Ignition setting incorrect | Check and adjust the contact gap | |
| Adjust the pre-ignition | ||
| Faulty ignition module / sensor | Replace the faulty unit | |
| Fuel fault | Too little fuel in tank | |
| Soiled fuel filter | ||
| Dirt in fuel pipe. Pinched or blocked hose | ||
| Faulty carburettor | Blocked needles | |
| Clean the carburettor setting | ||
| Correct the carburettor setting | ||
| Retighten / Replace gasket | ||
| Choking | Test with oil | |
| Clean or replace the fuel filter | ||
| Overloading | Change to right spark plug | |
| Ignition fault | Pre-ignition incorrect | |
| Faulty ignition module / sensor | ||
| Incorrect setting | ||
| Carburetor problems | Partially or completely blocked needles and diffuser jets | |
| Too little or no oil in the engine | ||
| Fill with right quantity and quality of oil | ||
| Insufficient cooling | Clean off dirt and leaves | |
| Change the fan and clean the fan cover |