JHZR2
Staff member
TBH that doesn’t even make sense to me.My in laws 11 year old boiler a Buderus gas condensing has had three replacements of that sensor and once on control unit. Finally Bosch new owner of Buderus stopped making controller part and they have no heat situation but hot water so they finding a tech who can remove this optional part.
It saves for sure in energy however the tech calls and parts involved savings gets eaten fast with high efficiency boilers.
The outdoor reset is a simple thermistor. And if it is disconnected, the logic resets to the default temp. It works by keeping the working fluid temperature much lower when ambient is higher. In our climate in NJ, the boiler resets to default temperature (set by what kind of radiation you have, in our case cast iron radiators) at 17F.
So loss of the non-critical outdoor reset shouldn’t result in a no-heat. You sure there isn’t a bigger issue?
Knocking on wood our peerless purefire and partner indirect hot water have been excellent.