Outboard not cooling / no tell-tale stream
Outboard engine · Yamaha
Symptoms: No or weak tell-tale stream, overtemperature alarm, engine in protection mode.
Causes and solution →27 fault sheets
Hard starting / rough idle (petrol)
Outboard engine · Mercury Marine
Symptoms: Hard starting, hesitation, stalling at idle, loss of power when accelerating.
Causes and solution →Damaged sterndrive bellows / water ingress
Sterndrive engine · Volvo Penta
Symptoms: Water in the bilge, milky drive oil, noise from the universal joint.
Causes and solution →Low fresh-water output / high salinity
Watermaker · Schenker
Symptoms: Reduced production, TDS/salinity above the limit, unstable working pressure.
Causes and solution →Bow thruster not working / stops after a few seconds
Bow/stern thruster · Side-Power (Sleipner)
Symptoms: No thrust, relay clicking, thermal protection tripped, blown fuse.
Causes and solution →House batteries discharging quickly
12/24V electrical system / Batteries
Symptoms: Low resting voltage, services shutting down, charger not completing the charge.
Causes and solution →Stiff or jammed headsail furler
Deck gear / Sails (mast, headsail furler, mainsail) · Harken
Symptoms: Difficulty furling or unfurling the sail, squeaking, furling line overriding.
Causes and solution →Autopilot wandering off course / compass errors
Autopilot · Raymarine
Symptoms: The boat snakes, off-course alarms, difference between heading and actual course.
Causes and solution →Cooling water overtemperature
Main diesel engine
Symptoms: HT high-temperature alarm, loss of power, steam from the vent.
Causes and solution →Abnormal separator vibration
Purifier/Separator · Alfa Laval
Symptoms: High noise and vibration, unbalance alarm.
Causes and solution →Knocking under load
Gas engine · MWM (Caterpillar Energy)
Symptoms: Knocking, automatic derating, uneven exhaust temperatures.
Causes and solution →Excessive black smoke on acceleration
Diesel traction engine · Cummins
Symptoms: Dense black smoke, loss of power, high fuel consumption.
Causes and solution →APU not reaching rated speed
APU · Honeywell
Symptoms: Slow start, high EGT, automatic shutdown.
Causes and solution →Cavitation and loss of head
Pumps (centrifugal/positive displacement) · Grundfos
Symptoms: Gravel-like noise, vibration, insufficient flow.
Causes and solution →Auxiliary boiler burner lockout
Boilers · Alfa Laval Aalborg
Symptoms: Failure to ignite, flame failure alarm, smoke at start-up.
Causes and solution →Hydraulic winch slow or erratic
Winches · MacGregor
Symptoms: Jerky movement, reduced pulling force, oil overheating.
Causes and solution →Pressure loss in the brake pipe
Brake system (pneumatic) · Knorr-Bremse
Symptoms: Unwanted emergency braking, slow reservoir recharge, low-pressure alarm.
Causes and solution →Wärtsilä 46 — fuel injection pump leak
Main diesel engine · Wärtsilä
Symptoms: Fuel seeping from the injection pump, drop in rail pressure, leak-fuel alarm, smell of fuel in the engine room.
Causes and solution →Auxiliary generator hard to start
Auxiliary engines / Generators · Caterpillar
Symptoms: Slow start, unstable idle speed, stalling, white smoke when cold.
Causes and solution →Starting air compressor not charging
Air compressors · Sperre
Symptoms: Air bottle pressure not reached, long charging times, overheating.
Causes and solution →Hydraulic steering gear slow to respond
Steering gear · Rolls-Royce (Tenfjord)
Symptoms: Delayed rudder response, pump noise, high oil temperature.
Causes and solution →Jenbacher — cylinder misfire and derating
Gas engine · INNIO Jenbacher
Symptoms: Misfire on one cylinder, reduced power, unbalanced exhaust temperatures, misfire alarm on DIA.NE.
Causes and solution →Difficulty synchronising with the grid
Alternator / Generator · Marelli Motori
Symptoms: The genset does not lock to the grid, frequency oscillations, protections tripping.
Causes and solution →High EGT and high fuel consumption
Turbofan engine · CFM International
Symptoms: Exhaust gas temperature above normal, increased SFC, possibly reduced stall margin.
Causes and solution →Landing gear not retracting fully
Landing gear · Safran Landing Systems
Symptoms: Incomplete retraction sequence, unsafe light, abnormal hydraulic noise.
Causes and solution →Main compressor thermal overload
Air compressor · Knorr-Bremse
Symptoms: Repeated thermal trips, long charging times, oil in the air reservoir.
Causes and solution →Insufficient coach air conditioning
Onboard HVAC · Faiveley (Wabtec)
Symptoms: High temperature in the coach, compressor cycling, low refrigerant pressure alarm.
Causes and solution →No fault sheet matches your search. Describe the problem to us and we will get back to you.
The information on this page is general guidance. It does not replace the manufacturer’s manual or the work of a qualified technician: before any intervention, always check procedures, tightening torques and safety requirements in the official documentation of the machine.
Manufacturers covered
Engines (marine/industrial)
MAN Energy Solutions · Wärtsilä · Caterpillar (MaK) · Cummins · MTU (Rolls-Royce Power Systems) · Volvo Penta · Yanmar · Deutz · Scania · Mitsubishi (MHI) · Doosan · Hyundai HiMSEN · Niigata · Daihatsu · ABC (Anglo Belgian)
Gas engines / cogeneration
INNIO Jenbacher · MWM (Caterpillar Energy) · Wärtsilä · MAN Energy Solutions · Rolls-Royce Bergen · Perkins · Guascor (Siemens) · 2G Energy · Cummins
Aero engines
CFM International · Pratt & Whitney · Rolls-Royce · GE Aerospace · Honeywell Aerospace · IAE · Safran · Williams International
Rail engines
Cummins · MTU · Caterpillar · EMD (Progress Rail) · Wabtec · ABB (trazione) · Voith · ZF
Pumps
Alfa Laval · Grundfos · KSB · DESMI · Iron Pump · Sulzer · Framo · Shinko · Naniwa · Allweiler · Wilo · Azcue · IMO
Purifiers / Separators
Alfa Laval · GEA Westfalia · Mitsubishi (Samgong) · Alfa Laval S/P Flex
Compressors
Atlas Copco · Sperre · Hatlapa · Tanabe · Bitzer · Ingersoll Rand · Sauer · J.P. Sauer & Sohn · Bauer · Gardner Denver
Boilers
Alfa Laval Aalborg · Kangrim · Miura · Saacke · Bono · Cochran · Parat
Turbochargers
ABB Turbocharging · MAN Turbo · Napier · Mitsubishi Turbocharger · Kompressorenbau (KBB) · Garrett · BorgWarner
Turbines
Siemens Energy · GE Vernova · Solar Turbines · Mitsubishi Power · Ansaldo Energia · MAN Energy Solutions · Kawasaki
Alternators / Generators
Stamford (Cummins) · Leroy-Somer (Nidec) · Marelli Motori · ABB · Siemens · WEG · Mecc Alte · Hyundai · Taiyo
Hydraulic systems
Bosch Rexroth · Parker Hannifin · Danfoss · Kawasaki · Eaton (Vickers) · HAWE · Hydac · Sun Hydraulics
Winches / Cranes
MacGregor · Hatlapa · Rolls-Royce Marine · Kongsberg · TTS · Rapp Marine · Palfinger Marine
Steering gear
Rolls-Royce (Tenfjord) · Kongsberg · Kawasaki · SKF Marine · Frydenbø · Porsgrunn
HVAC / Refrigeration
Daikin · Carrier · Heinen & Hopman · Novenco · Johnson Controls · LTH Baas · Nordic Air
APU
Honeywell · Pratt & Whitney Canada · Safran Power Units
Brakes
Knorr-Bremse · Wabtec (Faiveley) · Dako · SAB WABCO
Electrical systems / Switchboards
ABB · Siemens · Schneider Electric · Terasaki · Eaton · Legrand · Socomec · Hyundai Electric · GE Power · Cummins Power
Drives / Inverters
ABB (ACS/DCS) · Siemens Sinamics · Danfoss Drives (VLT/VACON) · Yaskawa · Rockwell (Allen-Bradley PowerFlex) · Nidec Control Techniques · WEG · Mitsubishi Electric · Schneider Altivar
Automation / PLC / DCS
Woodward · DEIF · ComAp · Heinzmann · Kongsberg (K-Chief) · ABB Ability · Siemens Simatic · Wärtsilä (WOIS/SAM) · Emerson (DeltaV) · Bachmann · Beckhoff · Praxis Automation · Sperre Control
Instrumentation / Sensors
Endress+Hauser · WIKA · Danfoss · VDO (Continental) · Kongsberg Maritime · Autronica (Kongsberg) · Emerson (Rosemount) · Yokogawa · Honeywell · Krohne · Jumo
Electronics / Control units
Bosch · Continental / VDO · Sensata · Woodward · Heinzmann · Delphi (BorgWarner) · Denso · Texas Instruments · STMicroelectronics · Infineon · NXP · Omron · Phoenix Contact · WAGO · Weidmüller
Batteries / Energy storage
Exide · Hoppecke · EnerSys · Corvus Energy · Leclanché · Saft · Trojan · Sunlight
Fire-fighting
Consilium · Autronica · Tyco (Johnson Controls) · Minimax · Survitec
Navigation / Bridge
Furuno · Kongsberg · Raytheon Anschütz · JRC · Sperry Marine (Northrop Grumman) · Simrad · Garmin
Outboard engines
Yamaha · Mercury Marine · Suzuki Marine · Honda Marine · Tohatsu · Selva Marine · Evinrude (BRP) · Mariner · Parsun · Torqeedo (elettrico) · ePropulsion
Sterndrives / Transmissions
Volvo Penta · MerCruiser (Mercury) · Yanmar Marine · Vetus · Nanni Diesel · Craftsman Marine · Lombardini Marine · Sole Diesel · ZF Marine (trasmissioni)
Marine electronics / Autopilots
Raymarine · Garmin · Simrad · B&G · Furuno · Lowrance · Navico · Fusion (audio) · Standard Horizon · Icom · NKE Marine
Sailing / Deck gear
Harken · Lewmar · Selden · Antal · Facnor · Spinlock · Ronstan · Andersen Winches · Profurl · Lofrans (salpancora) · Quick (salpancora)
Thrusters
Side-Power (Sleipner) · Vetus · Quick · Lewmar · Max Power · Sleipner
Watermakers
Schenker · Dessalator · Spectra Watermakers · Sea Recovery · HRO (Horizon) · Idromar · Blue Water · Osmosea
Onboard generators
Fischer Panda · Onan (Cummins) · Kohler Marine · Mase Generators · WhisperPower · Paguro · Northern Lights · Vetus
The brands mentioned belong to their respective owners and are listed only to identify the equipment we work on.
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