Coachman Owner's Handbook (2026)
Official technical documentation and workshop diagnostics for Coachman Owner's Handbook (2026).
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
Green flashing | ATC active but self-test incomplete Possible Cause: Self test incomplete | Drive forward to detect movement to complete self test and re check LED | DIY Safe |
Red | ATC inactive | Remove 13 pin plug and wait 5 seconds. Reconnect plug | DIY Safe |
Red flashing | ATC has detected a fault | Remove 13 pin plug and wait 5 seconds. Reconnect the plug. If faulty and cannot be driven, remove push-rod as shown in the AL-KO handbook and consult AL-KO. | DIY Check / Tech Fallback |
LED not working | ATC has no power or LED faulty | Check push rod position as detailed in the AL-KO handbook before continuing your journey. Remove 13 pin plug and wait 5 seconds. Reconnect the plug. Check for constant live. | DIY Safe |
N/A | Pump fails to turn on Possible Cause: Loose wiring connection, pump circuit has no power, blown fuse, pressure switch failure, defective motor, or float switches fail to operate. | Remake a sound connection. Replace fuse/reset. Reset pressure switch using manufacturer's instructions. Replace pump. Contact Whale Support. | DIY Check / Tech Fallback |
N/A | Tank leaking from drain plug Possible Cause: Drain stem not engaged past O-ring. | Reseal ensuring the drain system is fully home. | DIY Safe |
N/A | Alde system is completely dead, control peak is blank | Check the 20 mm T3.15 Amp glass fuse in the boiler located under the lid of the black plastic service hatch, in a green plastic fuse holder. Check the 12V supply to the boiler, it should be above 12V. Check the 12V cable is plugged into the boiler and control panel. | DIY Safe |
N/A | Alde panel failure 1 & panel failure 2 Possible Cause: Moisture is trapped in the control panel. | Remove the Alde control panel from the vehicle and air in a warm, dry place overnight. | DIY Safe |
N/A | Alde gas failure Possible Cause: Out of gas or gas is not igniting. | Check the gas cylinder is full. Try a different gas cylinder, ensuring it is propane gas. | DIY Safe |
N/A | Alde overheat red fail or overheat blue fail | Bleed the system of air. Check the fluid level in the expansion tank (should be 1cm above Min mark when cool). Check the circulation pump is responding. Wait 15 mins for the fluid to cool down. | DIY Safe |
N/A | Alde overheat PCB Possible Cause: Failsafe in boiler has triggered. | Check the fluid level in the expansion tank (should be 1cm above the Min mark when cool). Check the boiler compartment is ventilated, and that the vents are unobstructed. | DIY Safe |
N/A | Alde connection failure Possible Cause: Loose connection between Alde control panel and boiler. | Unplug cable at the control panel and boiler, then carefully plug back in. Check there is slack on the cable at the control panel, but not excessive weight from free-hanging/unmanaged cable. | DIY Safe |
N/A | Alde low battery Possible Cause: 12V supply to boiler has dropped below 10.5V, possibly causing system brownout. | Automatically clears when 12V supply reaches 11V. | DIY Safe |
N/A | Aventa air conditioning unit appliance not cooling Possible Cause: Thawing process in progress or remote control temperature setting reached or too high. | Wait for thawing process to complete or adjust remote control temperature setting. | DIY Safe |
N/A | Aventa air conditioning unit device not heating Possible Cause: Thawing process in progress (outside temperature between 4ºC - 7ºC) or outside temperature below 4ºC. | Wait for thawing process or note that device does not operate below 4ºC outside temperature. | DIY Safe |
N/A | Aventa air conditioning unit cooling/heating inadequately or not at all Possible Cause: Panels dirty or external air routes soiled/blocked. | Clean panels and clear external air routes. | DIY Safe |
N/A | Water dripping out of Aventa air conditioning unit air distributor Possible Cause: Moisture on underside, condensation trap on external unit blocked, seal between appliance and roof not intact, or system at too much of an angle. | Close windows and doors and select high fan level. Clear condensation trap, check seal, or correct vehicle angle. | DIY Safe |
N/A | Aventa remote control not working or appliance not reacting Possible Cause: Batteries flat, remote out of range, or remote not paired. | Check and replace batteries in the remote control if necessary. Move into range or pair remote with air conditioning system. | DIY Safe |
Red LED flashing | Aventa air distributor red LED flashing Possible Cause: Error in the control system. | Switch the air conditioning system off, wait for a short time and then switch it on again. If the red LED remains lit, contact Truma Service. | DIY Check / Tech Fallback |
White LED flashing | Aventa air distributor white LED flashing Possible Cause: Bluetooth pairing not possible. | Delete superfluous Truma apps and repeat pairing. | DIY Safe |
N/A | Refrigerator does not start Possible Cause: Refrigerator is not switched on or vehicle is not level. | Switch on the refrigerator, make sure the vehicle is level, or try to start the refrigerator on another power source. | DIY Safe |
Error code 3 | Refrigerator does not work on gas Possible Cause: Gas bottle is empty, valve of the gas bottle and/or shut-off valves are closed, or refrigerator is not switched on. | Replace the gas bottle, open the valves, switch on the refrigerator, or try to run the refrigerator on another power source. | DIY Safe |
Operational Fault | Refrigerator does not work on 12V Possible Cause: Engine is not running or 12V fuse faulty. | Make sure the engine is running, check if the 12V fuse in the fuse box on your vehicle is operational, or try to run the refrigerator on another power source. | DIY Safe |
Error code 10 | Refrigerator does not work on 230V Possible Cause: Mains are not available. | Check if the mains is available or try to run the refrigerator on another power source. | DIY Safe |
Error code 11 | Refrigerator does not work in Auto Possible Cause: Sources are not connected. | Connect the sources or try to run the refrigerator on another power source manually. | DIY Safe |
N/A | Refrigerator has insufficient cooling Possible Cause: Ventilation openings completely or partially blocked, vehicle not level, selected cooling level too low, fans not switched on, door not properly closed, or too much ice on cooling fins. | Clean or remove blockage, make sure vehicle is level, select higher cooling level, switch on fans, close door, or defrost the refrigerator. | DIY Safe |
N/A | Burners do not burn or burn unevenly Possible Cause: Gas bottle is empty as tap is closed, burner caps are not correctly positioned, or burners are wet or clogged. | Change gas bottle and open tap. Allow caps to cool, then re-position them. Dry or clean burners. | DIY Safe |
N/A | Spark ignition does not spark Possible Cause: 12V DC battery is discharged, connections are loose, or ignition points are wet or dirty. | Charge battery, secure connections, or dry/clean ignition points. | DIY Safe |
N/A | Control knobs do not function Possible Cause: Knobs are mounted incorrectly. | Install knobs correctly. | DIY Safe |
LO-BAT | Safe lock doesn't close Possible Cause: Battery is low. | Replace the batteries. | DIY Safe |
E-CODE | Safe emits three short audible signals Possible Cause: False code or false master code entered. | Enter the correct code or master code. | DIY Safe |
HOLD15 | Safe emits two short audible signals whenever any button is pressed Possible Cause: The safe lock is disabled after the wrong code has been entered three times. | Wait for 15 minutes without pressing any buttons, then enter the correct code, or open the door mechanically with the master key. | DIY Safe |
N/A | TV reception very poor Possible Cause: Incorrect amplifier gain, incorrect antenna alignment, or wrong polarity. | Check the amplifier gain is set to maximum (rotate clockwise). Check antenna alignment directed at the transmitter. Ensure polarity is correct (horizontal or vertical). Bypass amplifier using Short Hook-Up Test 1 and re-tune TV. | DIY Safe |
N/A | Low Leisure Battery Voltage Warning displayed on control panel Possible Cause: Leisure battery voltage has dropped below 11V (default threshold). | Recharge the leisure battery (via mains hook-up, solar, or the vehicle engine) as soon as possible. Persistent low voltage can indicate a battery nearing the end of its life or an underlying charging fault. | DIY Safe |
N/A | Low Vehicle Battery Voltage Warning displayed on control panel Possible Cause: Vehicle (chassis) battery voltage has dropped below 11V (default threshold). | Check the vehicle battery and its charging system. Persistent low voltage can prevent the engine starting and may indicate a battery or alternator fault. | DIY Safe |
N/A | High Leisure Battery Voltage Warning displayed on control panel Possible Cause: Leisure battery voltage has risen above 14.9V (default threshold). | Check the charging source (mains charger or solar controller) for a fault causing overcharging - sustained high voltage can damage the battery. | DIY Safe |
N/A | High Vehicle Battery Voltage Warning displayed on control panel Possible Cause: Vehicle battery voltage has risen above 14.9V (default threshold). | Check the vehicle's charging system (alternator/regulator) for a fault causing overcharging. | DIY Safe |
N/A | High Leisure Battery Current Warning displayed on control panel Possible Cause: Leisure battery current draw has exceeded 20A (default threshold). | Check for an appliance or fault drawing excessive current from the leisure battery. | DIY Safe |
N/A | High Vehicle Battery Current Warning displayed on control panel Possible Cause: Vehicle battery current draw has exceeded 20A (default threshold). | Check for an appliance or fault drawing excessive current from the vehicle battery. | DIY Safe |
N/A | High Load Current Warning displayed on control panel Possible Cause: Total load current has exceeded 18A (default threshold). | Reduce the number of appliances running simultaneously, or check for a fault causing excessive current draw. | DIY Safe |
N/A | High Solar Panel Current Warning displayed on control panel Possible Cause: The solar panel is providing more than 15A (default threshold). | This is often just informational (strong sunlight), but persistent very high readings are worth checking against the solar controller's own rated limits. | DIY Safe |
N/A | High Mains Current Warning displayed on control panel Possible Cause: The mains supply is drawing more than 16A (default threshold). | Reduce the number of high-draw appliances (e.g. kettle, heater) running on the mains hook-up simultaneously, or check the site supply's own rated capacity. | DIY Safe |
N/A | No Communications Warning displayed on control panel Possible Cause: A communication fault has occurred on the control panel's LIN network. | Check the wiring/connections to the control panel. If the warning persists, contact your dealer. | DIY Check / Tech Fallback |
N/A | Fuse Blown Warning displayed on control panel Possible Cause: A fuse protecting one of the caravan's circuits has blown. | Locate and replace the blown fuse with one of the correct rating. | DIY Safe |
N/A | FET Overcurrent Warning displayed on control panel Possible Cause: An overcurrent fault has been detected from within the control panel itself. | Contact your dealer or an authorised service centre, as this indicates a fault with the control panel's own output circuitry. | Professional Intervention Required |
N/A | Thermistor icon displayed on control panel Possible Cause: A fault has been detected with one of the control panel's temperature sensors. | Contact your dealer or an authorised service centre to check the temperature sensor. | Professional Intervention Required |
N/A | Waste Level High Warning displayed on control panel Possible Cause: The waste water tank level has reached 90% or over (default threshold). | Empty the waste water tank. | DIY Safe |
N/A | Water Level High Warning displayed on control panel Possible Cause: Despite the icon's name, this actually indicates a LOW fresh water level - it displays when the water level has dropped to 10% or under (default threshold). | Refill the fresh water tank. | DIY Safe |
N/A | Carbon monoxide alarm emits a single chirp once per minute and the Fault LED flashes once per minute (for up to 30 days) Possible Cause: The detector's continuous self-check has found the sensor/circuitry settings to be incorrect, or the power pack has become low. | Since the power pack is designed to last the lifetime of the unit and is not user-replaceable, this fault indicates the detector itself needs replacing - the detector will not protect against CO poisoning once the power pack has drained. Contact your dealer or the detector manufacturer. | Professional Intervention Required |
Frequently Asked Questions
Q: How do I calibrate the Watermaster IC water system?
1. Press and hold the calibration button until the green LED starts to flash after 1-3 seconds. 2. Open the cold shower and the pump should start. 3. After approximately 30 seconds, turn off the shower. 4. After approximately 10 seconds, press and hold the calibration button again until the LED turns green and the pump will stop after approximately 10 seconds. 5. The green LED should turn off and blink briefly every 5 seconds indicating the system is calibrated.
Q: How do I adjust the torque settings for caravan wheels?
Tighten all bolts equally in the specified sequence. Torque settings are: Steel wheels 88Nm (65 lbs/ft); Alloy wheels 130Nm (96 lbs/ft). For alloy wheels, first tighten all bolts to 85Nm (63lbs/ft) then go around again in sequence and increase the torque to 130Nm (96lbs/ft). Use correct conical and tapered wheel bolts stamped 10.9.