Simply remove the front panel, where the circuit board and controls are, and pop the new panel back on. As I had not checked the part when it was delivered I was expecting a lot of hassle to get it changed. Bought this as a replacement for the same unit which had burned out (I suspect following a number of power cuts in the area). My question is, as we have had to move some appliances around the kitchen, the st699 is now awkwardly behind the fridge freezer. It will fit into the same backplate and is easy to programme with a slider switch, which includes plus and minus buttons.

The ST699 is a 24-hour dual zone timer that is designed to replace the programmer on both gravity primary systems and fully pumped systems, with separate heating and hot water temperature controls.The programming sequence for the ST699 is straightforward, using the top slider switch and [+] and ['] buttons. Also my mate has the same Honeywell 699 programmer on a gas system and needs the same remote controllability as the programmer is in an inaccessible place.

From the product page you can use Paypal Express Checkout which will take you straight to your Paypal account where you can login to complete payment or apply for Paypal Credit.The engineer scheme is here to support you and your clients, simply save yourself time and money on finding parts and gain access to our massive catalog of over 110,000 parts. This is currently controlling a Honeywell S plan system - CH and DHW (and has done for ages) with absolutely no probs on a Worcester system oil boiler. Warranty: Most parts come with a 1 year warranty, With parts where warranty is applicable, we do not extend warranty after the 1 year period.