Boiler shows E07 and will not operate; may be associated with very low or very high system pressure.

Safety: Allow the system to cool before topping up pressure. Use only clean mains water via the filling loop.

Steps:

• Check pressure gauge: Confirm the reading on the Attack boiler display or mechanical gauge. If below the recommended level (often 1.0 bar cold), top up using the filling loop until correct.
• Bleed air: After topping up, bleed radiators and recheck pressure, adjusting as needed.
• Inspect for leaks: Look around the boiler, safety valve discharge pipe, and radiators for signs of water loss that could cause low pressure.
• Sensor inspection: Locate the water pressure sensor on the hydraulic block. Check for leaks, corrosion, or a blocked sensing port. Gently tap the sensor body to free any stuck diaphragm.
• Reset boiler: After correcting pressure, reset the boiler and observe if E07 clears.

Technician: If the code remains with correct pressure, the sensor or PCB likely needs replacement by an authorized Attack service provider.