E7 alarm: condensate level high or condensate pump fault; unit may shut down.

Safety: Isolate power before working on the condensate pump. Condensate may be mildly acidic.

• Check drain hose: Ensure the condensate hose from the Nibe unit to the drain is not kinked, blocked, or frozen.
• Clean trap: Remove and clean the condensate trap and any filters. Flush with clean water.
• Test pump: If a condensate pump is fitted, pour water into the pump reservoir and see if it activates (with power on). If not, check its power supply.
• Reset alarm: After restoring drainage, reset the E7 alarm.

Replace the condensate pump if it fails to run despite correct power.