Worcester Greenstore E1X.T1 fault code
Worcester Greenstore & Greensource heat pumps
What the Worcester Greenstore E1X.T1 fault code means, from the manufacturer's own service literature, and the UK models it applies to.
What it means
The compressor stops because the flow temperature is too high for the heating circuit. Activated when the sensor shows a value which is 5K higher than the highest set point value for the circuit. The factory setting for the highest set point value is 60 °C for radiator type of circuit and 35 °C for underfloor type of circuit. After hot water production, the alarm is delayed with 4 min.
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 E — Stops compressor; lamp+buzzer; 5 s delay; restart before ack. Resets when: The sensor's value falls below the temperature for beginning of the heating demand. Automatic once the alarm cause has disappeared.
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 E1X.T1 on that machine.
Now the harder half: proving what caused it
E1X.T1 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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