BoilerFaultCodesWhat the manual says
Manufacturer manualInverter Error
What causes this fault?
This fault occurs when the internal power management system, known as the inverter, stops communicating correctly with the main computer of the heat pump. The most common reason is an electrical failure within the inverter circuit board due to power surges or component wear, which prevents the unit from controlling the fan and compressor speed.
This fault can be more frequent during summer or extreme heatwaves, as high ambient temperatures put additional thermal stress on the electronic power components.
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 J46: no call-out fees, no surprise bills.
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