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Worcester Greenstore E21.E2 fault code

Worcester Greenstore & Greensource heat pumps

What the Worcester Greenstore E21.E2 fault code means, from the manufacturer's own service literature, and the UK models it applies to.

What it means

Faulty electric heater

The electric heater is turned off. Activated by tripped overheat protection on the electric additional heat, high flow temperature or too high temperature in electric additional heat. The automatic trip fuse to the electric additional heat may have been tripped due to, for example, a short circuit.

Source: Worcester Greenstore LECP Installation, Commissioning and Servicing Instructions 6 720 806 768 (2013/02), §21.8 categories + §21.10 alarm functions + §21.13 information log (render-verified)

Can it be reset?

Category F — Stops additional heat; 1 s; ack required. Resets when: Overheat protection reset. Acknowledgement is required.

Source: Worcester Greenstore LECP Installation, Commissioning and Servicing Instructions 6 720 806 768 (2013/02), §21.8 categories + §21.10 alarm functions + §21.13 information log (render-verified)

UK models this code applies to

Tap yours to open E21.E2 on that machine.

Now the harder half: proving what caused it

E21.E2 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.

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