Honeywell Frost Protection wiring

23 Mar 2015
Reaction score
United Kingdom
I have a Vaillant eco.TEC pro 24, I have fitted a Siemens RF timer and temperature controller and now need to fit a Honeywell Frost protection kit K42008628-001, I have fitted the timer wiring to the RT 24 this is 24volt this works.

I need to connect the wire from the frost stat and pipe stat to the boiler it's 230v +, do I connect to the RT 230 v AC next to the main supply?

How can I check the frost stats now as it is not freezing?

Will the frost stat work even if the room stat's or timer are off?
Sponsored Links
yes but the pipes in the garage where the boiler is could freeze, so I have put a pipe stat on the return.
Sponsored Links
Yes but no but.....

The boiler has two stage frost protection (using the pump, and then the burnner if necessary) and is apparently in the same space as the pipes you are protecting.......

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local