BoilerFaultCodesWhat the manual says
Manufacturer manualGas valve electrical connection fault - The PCB detects a fault on the gas valve supply. Check its connection. (The fault is detected and displayed only in the presence of a request). Upon confirming that the fault does not concern the gas valve, you must replace the PCB if the fault does not disappear after pressing the Reset button
From this model's manual
Verified against the Alpha/Alpha E Tec Plus Nx installation & service manual.
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.
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All 37 fault codes on the E-Tec Plus 28NX
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