E6 — Pressure sensor

The pressure sensor cable is broken or the sensor itself has failed.

What does fault E6 mean?

The pressure sensor cable is broken or the sensor itself has failed.

How is fault E6 cleared?

Check the green light on the back of the sensor. If it is off, the sensor or its cable is faulty.
Inspect the sensor cable along its length.
If the problem remains, replace the sensor.

To clear a fault, press the Cancel key on the main screen.

Which model is right for the pump?

Several HYDROSET PM821 faults appear when the unit's rating does not match the pump's nameplate current. The table below gives the right model for each pump current.

Model selection table
Pump current	Pump power	Model	Typical use
up to 8 A	up to 1.5 kW	PM821-8	1–4 floors, homes and shops
8 – 16 A	up to 3 kW	PM821-16	5–10 floors, booster sets
up to 25 A	up to 4 hp	PM821-25	Residential, commercial and agricultural

The current on the pump nameplate decides the model, nothing else.

Frequently asked questions

How is a fault cleared?

To clear a fault, press the Cancel key on the main screen.

What does fault E6 mean?

The pressure sensor cable is broken or the sensor itself has failed.

All fault codes HYDROSET PM821 user manual

Last updated: 7 September 2026