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Worcester Greenstore E21.RLP fault code

Worcester Greenstore & Greensource heat pumps

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

What it means

Temporary heat pump stop E21.RLP (information)

Refrigerant-circuit pressure too low. Repeated occurrences within a time period transform into the category A alarm (21.10.2).

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 I — Information — temporary compressor stop; repeated ⇒ category A. Resets when: Pressure returns to the permitted level.

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.RLP on that machine.

Now the harder half: proving what caused it

E21.RLP 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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