The alarm is totally unresponsive

Check that the batteries have not become dislodged:

1. Open the alarm casing by inserting a coin between the two raised ridges at one end of the alarm and twisting;
2. Check the batteries are in place: push them into line and roll them round with your finger.
3. Close the casing and plug the sensor in and test it by dipping it in a glass of warm water.

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