BoilerFaultCodesWhat the manual says
Manufacturer manualInverter Error
What causes this fault?
This fault occurs when there is a breakdown in communication between the heat pump's brains and the power system that drives the compressor. It is usually caused by an electrical failure on the inverter circuit board or a loose connection in the high-voltage wiring that prevents the system from regulating power safely.
This fault is more common during summer heatwaves or extreme winter cold, as the inverter components are pushed to their thermal limits while trying to maintain indoor comfort.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like L46: no call-out fees, no surprise bills.
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