No Maintenance Sign

No Maintenance Sign

A no maintenance sign is used to warn crew and contractors against carrying out repair, servicing or adjustment work on equipment that is running, energised, pressurised or otherwise unsafe to work on at that moment. This sign is a prohibition pictogram rather than an instruction, so it is typically displayed on or near machinery, electrical panels or systems where maintenance must wait for the equipment to be properly isolated, shut down and tagged before any work begins, reinforcing the lockout and isolation procedures already in place on board.

Built to ISO 7010 pictogram conventions, this no maintenance sign uses a black prohibition symbol on a white background inside the standard red circle and diagonal bar, giving a clear, language-independent warning wherever it is fitted. Stocked under IMPA code 33.8556 and ISSA code 47.585.56, this sign can be ordered by ship chandlers and marine suppliers alongside other engine room and workshop signage during a scheduled port call or maintenance period.

Supporting lockout and isolation procedures

A no maintenance sign is commonly displayed on pumps, compressors, conveyor systems, electrical switchgear and other machinery where working on the equipment while it is running or energised would put the technician at serious risk. Fitting the sign directly on or beside the equipment, alongside any isolation tags or lockout devices in use, reinforces to anyone approaching that maintenance is not to proceed until the correct isolation, permit or shutdown steps have been completed by the responsible engineer. This pairs naturally with a vessel’s existing lockout-tagout procedures, giving crew a visual cue that matches the physical isolation already applied to the equipment.

Safety Sign Hub manufactures every no maintenance sign in a fire-retardant, photoluminescent material, so the pictogram remains visible in engine rooms and workshop spaces even if lighting is reduced or power is temporarily lost. The substrate resists oil, grease and the heat typical of machinery spaces, so a sign mounted near a pump, compressor or switchboard continues to perform after repeated exposure to the conditions found around working equipment rather than degrading quickly.

Safety Sign Hub stocks this no maintenance sign in standard marine signage sizes, with a lightweight self-adhesive tag format suited to temporary isolation points and a rigid panel option for equipment where the same maintenance restriction applies on a recurring basis. Ordering under the IMPA and ISSA codes listed here lets an engineer or purchasing officer requisition the exact pictogram needed for a permit-to-work pack, rather than describing the required wording and layout from scratch each time.

Aligning with recognised safety signage practice

Using a no maintenance sign as part of a documented isolation procedure reflects the general safety signage guidance published by Safe Work Australia and the pictogram conventions of ISO 7010 that underpin AS 1319 in Australia. Vessel operators who fit the same IMPA and ISSA coded sign on comparable equipment across a fleet give engineers and contractors a consistent, recognisable pictogram to respond to, supporting safer maintenance practice wherever the equipment is located.

Engineers running a planned maintenance schedule often find it useful to keep a small stock of this pictogram in the workshop alongside isolation locks and tags, so a piece of equipment can be marked the moment it is taken out of service rather than left unmarked until a sign can be sourced. This is particularly relevant during a busy maintenance period or dry-docking, when several pieces of machinery may be isolated for work at the same time and a consistent pictogram helps everyone on the team recognise at a glance which equipment is not yet cleared to return to service. Removing the sign only once isolation has been lifted and the equipment signed back into service keeps the visual warning accurate throughout the job.

Display this no maintenance sign on equipment that is out of service to prevent crew from attempting repairs or adjustments during scheduled downtime. Browse our full range of Prohibition Signs for more IMO-compliant maritime safety signage.