Junkers Water Pressure / Flow Fault (for models with internal pump or pressure switch)

E1 error; heater does not start, or shuts down quickly after ignition.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low inlet water pressure, Blocked inlet filter, Faulty water pressure switch, Air in system

Safety: Turn off power before opening any water components.

Check mains pressure: Ensure cold water supply to the heater is open and has adequate pressure.
Clean filters: Remove and clean the inlet filter and any strainers in the cold supply line.
Bleed air: Open hot taps fully to purge air from the system after any plumbing work.
Inspect pressure switch: On models with a water pressure switch, check the wiring and small sensing tube for blockages.

Medium 3/5

Water Pressure Switch / Inlet Filter

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