E1 — Over current

The pump current has risen above the limit set in F3.

What does fault E1 mean?

The pump current has risen above the limit set in F3.

How is fault E1 cleared?

Compare F3 with the current on the pump nameplate.
Make sure the pump is not more powerful than the model rating.
Clear the fault and start the pump again.
If it returns, contact your dealer.

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 E1 mean?

The pump current has risen above the limit set in F3.

All fault codes HYDROSET PM821 user manual

Last updated: 7 September 2026