Worcester Greenstore E21.RHP fault code
Worcester Greenstore & Greensource heat pumps
What the Worcester Greenstore E21.RHP fault code means, from the manufacturer's own service literature, and the UK models it applies to.
What it means
Refrigerant-circuit pressure too high. Repeated occurrences transform into the category A alarm (21.10.3).
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
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E21.RHP 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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