E2 — Load missing

The unit sees no pump current at all.

What does fault E2 mean?

The unit sees no pump current at all.

How is fault E2 cleared?

Check the cable between the unit and the pump, and its terminals.
Check the pump capacitor.
Check the pump temperature; the thermal switch inside may have cut the current. Let it cool.
Clear the fault, and contact your dealer if it returns.

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 E2 mean?

The unit sees no pump current at all.

All fault codes HYDROSET PM821 user manual

Last updated: 7 September 2026