BoilerFaultCodesWhat the manual says
Manufacturer manualNo connection Outdoor PCB to Inverter PCB
What causes this fault?
This fault occurs when the main computer board and the motor controller inside your outdoor unit lose their ability to send signals to one another. The most common reason is a loose or damaged wiring connection between these boards, though it can also be triggered by a localized electronic failure on one of the circuit boards themselves.
This fault can be more frequent during periods of heavy rain or high humidity, as moisture ingress into the outdoor casing can sometimes interfere with sensitive communication wiring.
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 H1: no call-out fees, no surprise bills.
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