Bush freezer shows E7 and may run the compressor continuously or not at all; temperature may drift significantly from the set point.

Safety first: Disconnect the freezer from mains power before accessing the control board. Electronic repairs should be done carefully to avoid electric shock.

E7 often points to an internal fault on the main control PCB rather than a sensor or mechanical issue.

• Rule out sensor faults: Confirm that cabinet and evaporator sensors are properly connected and not showing their own error codes (E1/E2). If sensors are good, proceed.
• Access main control PCB: On many Bush freezers, the main board is located behind a cover at the rear or in the top control housing. Remove the cover screws and gently expose the board.
• Inspect visually: Look for burnt components, swollen capacitors, or darkened areas on the PCB. Check for loose connectors or signs of overheating.
• Check supply voltage: For advanced users with proper tools, verify that the board is receiving correct mains input and low-voltage outputs (per service data). Only do this if you are competent and with power safety precautions.
• Replace the control board: If the board is visibly damaged or E7 persists after all other checks, replace the main control PCB with the correct Bush part number. Transfer any wiring harnesses one by one to avoid misconnection.
• Reassemble and test: Refit covers, restore power, and monitor freezer operation and temperature stability.

Because this involves live mains circuitry and configuration, many users should engage a qualified appliance technician for control board replacement.