E13 error and the Amfa4000 reports a temperature fault

Safety first: Hot water can scald. Allow pipes to cool before disassembly. Disconnect power before opening the control head.

• 1. Confirm plumbing orientation: Verify that the Amfa4000 is connected to the cold mains feed only, not to a hot water line. Correct any mis-plumbing immediately.
• 2. Check for backflow: If a mixer tap or appliance is causing hot water to push back into the cold line, install or service non-return/check valves as required.
• 3. Inspect temperature sensor: Locate the temperature probe on the Amfa4000 valve head or inlet manifold. Ensure it is firmly seated and the wiring is intact.
• 4. Reset and test: After correcting any plumbing issues, clear E13 and run water through the system. Monitor the temperature reading if available.

If the inlet is confirmed cold but E13 persists, the temperature sensor or control board input is likely defective and should be replaced.