Ideal Icos HE18 Frost Stat Issue

[northie]

should be fine then as the other pipewor, might be worthwhile changing it to an automatic one, but many succesfully work with just a gate valve set up properly inside the house will be protected by the hive, you just need to get the by-pass setting right

Thanks, will continue with the trial and error on that valve for now.

Really appreciate the assistance!

 

[ianmcd]

Start with the valve fully open, then gradually turn it down untill the boiler starts to kettle,then open up again 1/4 turn, just turn the frost stat up as high as it will go untill you get the balance then turn the frost stat back to the origional settings, I usually use 5 deg on frost stat and 22 deg on pipe stat, no actuall set settings just what I have had most success with

 

[DP]

That won't protect the boiler (in the garage) very well....

OP If you had a 'real' bypass then current setup would be fine- the garage will tend to be colder than the house so pump only running through the bypass would do, added bonus you don't get disturbed by any rad warming noises.
Since it isn't a proper bypass you'd be better off sorting the control wiring- that gate valve will be reducing the differential pressure between flow and return (so your rads that are now slow to heat will be even slower), also boosting the return temperature (so your boiler may start derating to maintain the ideal flow/return temperature difference.
See what happens tonight- mind, it's warming up here- was -3 this afternoon, it's up to 7 now

Picture below shows my suggestion works like a charm.
Hall temperature prior to switch point was 12 degrees same as set temperature over night and weather was as in the picture above