Your heat pump's internal motor system is drawing too much electricity, causing the unit to shut down to protect its electrical components.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Inverter High Current
What causes this fault?
This fault occurs when the heat pump's internal electrical system detects a sudden surge or an unsustainably high flow of electricity. It is usually caused by a failing compressor that is struggling to turn or a fault within the electronic control board that manages power distribution. To prevent permanent damage to the wiring, the system automatically shuts down as a safety precaution.
This issue can be more frequent during extreme winter temperatures when the compressor has to work at its maximum intensity for long periods to extract heat from the cold outside air.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like J11 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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