On Wed, 21 Oct 2009 18:09:36 +0100, Harry Bloomfield wrote:

No, the transmitter part shows that it thinks the heating is on.
(little fan symbol)

That doesn't answer the question that was asked. Have you checked
that any programmer/switch before the *reciever* is also on.

Read the instructions, it may have lost its 'pairing'.

I'd check any batteries first then check the pairing (or more likely
just go through the pairing sequence).

I expect the light on the Rx only comes on when it has correctly
received a call for heat from the Tx.

--
Cheers
Dave.