Friend of mine has an oil boiler in the garage with a frost stat fitted. She says that when the frost stat operates the boiler, the room stat has no effect on turning the boiler off and has to run outside to the garage to switch off the boiler. Heating engineer carried out a service and she explained this, he said she needed a pipe stat fitting to work in conjunction with the already fitted frost stat. I don't normally touch heating electrics as mainly industrial but she has asked me to sort it. I have googled but can't find the answer I require. Does anyone have or can point me in the direction of a full wiring diagram of a combi oil boiler with frost / pipe stat wiring with a room stat also.
Many thanks.
Many thanks.