Cold Radiator

[nicro3]

This time last year did a job for a friend on conventional pumped heating system. The down stair kitchen rad was a add on to the system on a dropper and she said the rad had never worked since it was put in .
I pulled some water through thinking air lock and its been fine for a year.
Got call last week the same problem, this time did same it worked for a day then didn't
Any thoughts on what the problem could be.

 

[SimonG]

Dodgy TRV, replaced three in as many days.

 

[nicro3]

Thanks Simon,do not think it is trv as with head removed still not working and pin free.

 

[Goal difference]

Sealed system or F&E - chasing the bubble - night mare - draw water through again then balance system, closing lock shields by half a turn on rads before it on circuit. Good luck

 

[nicro3]

With all other rads on system shut, still no good.

 

[stegas]

Close all rads except the cold one,fire it up,then draw some water from l/s drain till hot,then gingerly balance the rest.

 

[nicro3]

The thing that is throwing me is worked all last year no probs and it not need rebalancing.