Status E1

Room temperature sensor requires adjustment.

? What Causes This

Temperature display is off by a few degrees and there is no precision temperature gauge/meter available, or room thermostat location must be adjusted for accuracy.

ⓘ What This Means

If precise adjustment needed: Use a reference meter to measure the actual room temperature deviation. Turn the knob clockwise to increase the value and counterclockwise to decrease it. Adjust according to needs for ± 5°C.

Source: page 17 of the official manual

From the manual

This error code appears in:

Worcester Greenstar Comfort II RF