DC isolators — the switches on your roof that disconnect panels from the inverter — are the single biggest fire risk in UK solar systems. Cheap units from 2010-2016 are now failing at scale.
## Signs of a failing DC isolator
- Visible discolouration or melting on the enclosure
- Moisture inside the clear cover
- Reduced output or intermittent faults
- Smell of burning plastic near the array
## If you see any of these, call us immediately
Turn off the system at the AC isolator and call 0800 099 6606. Our [emergency solar panel repair](/emergency-repair) team responds within 24 hours across [Manchester](/solar-panel-repair), [Liverpool](/locations/liverpool), [Leeds](/locations/leeds), and nationwide.
## Replacement cost
A single DC isolator replacement typically costs £180-£280. Full housing replacement with modern Santon or Eaton parts: £350-£450.
dc isolatorfire riskrepairsafetynorth west
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