What Fault 12 Means
Fault 12 is the over-current side of the same combined measurement: the low ambient heater, PC fan and FC fan together are drawing more current than the module expects. The documented sequence is identical - the shared six-way connector first, re-termination second, the power/control module last.
Common Causes of Fault 12
- A short in the shared fan and heater wiring
- A fan motor dragging on worn bearings and pulling excess current
- A heater or fan winding that has partly shorted
🔧 One Safe Check You Can Try
Leave it to a technician, but note any change in running noise. A fan that has begun to grind or surge loads its circuit heavily, and that observation narrows the search before anyone opens the cabinet.
⚠ Why You Shouldn't Go Further Than That
- Take the appliance off supply before anything behind the panels is investigated, since an over-current condition is the worst case to probe on a live circuit.
- An over-current that has already passed through the module may have damaged its output stage, which is a separate check the repair should cover.
- Leaving the cabinet running keeps an overloaded circuit connected to the board that reported it, which risks turning a fan repair into a module repair.
- The three parts share one connector, so disturbing it to test one disturbs the other two at the same time.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.