After a battery change, a new installation run must be performed. After the new batteries have been inserted, three dashes first appear in the display, after a few seconds the display automatically jumps to POS, press the menu key once to start the installation run. The display jumps to InS. Then the last set temperature is displayed.
Note:
Using rechargeable batteries or the wrong batteries can damage the DuoFern radiator actuator.
Only use leak-proof batteries of type AA 1.5 V (LR6).
If a battery has leaked, we recommend replacing the DuoFern radiator actuator with a new device.
Make sure that the polarity is correct when inserting the batteries.
