Just had home breakdown cover company out to some rads that could not be controlled with the trv's. The original trv's were 10 years old and made by eca, he said the mounting clips had snapped so this is why they were not working as they were no longer sitting properly on the pin. He's replaced all the heads to be safe with new ones made by Altech.
They are very stiff to turn and I am wondering if he's put them on too tight. Also should the valve body that goes onto the radiator with the pin in it have been changed as well or will these new ones now not control properly due to diff valve body and heads being from a diff manufacturer. Some of the rads were cold after they were replaced and he said that the pins were jammed down but they were ok before. He also said that they are ok to replace as long as they fit the valve body. The problem is that they do not come on unless turned above 4 and to get the rad hot they need to be on 5. Anything below 4 and they do not come on and that's with a room temp of 17c.
Thought I would come and ask the experts here after the visit.
Regards
Richard.
They are very stiff to turn and I am wondering if he's put them on too tight. Also should the valve body that goes onto the radiator with the pin in it have been changed as well or will these new ones now not control properly due to diff valve body and heads being from a diff manufacturer. Some of the rads were cold after they were replaced and he said that the pins were jammed down but they were ok before. He also said that they are ok to replace as long as they fit the valve body. The problem is that they do not come on unless turned above 4 and to get the rad hot they need to be on 5. Anything below 4 and they do not come on and that's with a room temp of 17c.
Thought I would come and ask the experts here after the visit.
Regards
Richard.