Why is my radiator not heating up?

solution for radiator that does not heat up

With a damaged radiator, the comfort of your home decreases: the area covered by the radiator cools and the temperature of the house becomes uneven. At the same time, and for the same reason, the cost of heating increases because other radiators work more to make up for the lack of heat in the unheated room.

If you suspect the radiator is damaged because it does not heat up, check the boiler pressure gauge first. It could be a solution for radiator that does not heat up. To rule out other problems, check that the boiler pressure is not less than 1 bar (pressure unit) and that the heating temperature is not excessive.

What are the solutions when the radiator does not heat up?

If the radiator is completely cold and the other radiators are working fine, here are some tips for identifying the fault:

  • One of the most common causes of failure is the air in the radiator. In this case, the solution is simple: it suffices to evacuate the air from the heating circuit through the degasser.
  • It also happens very often that the radiator key is closed. The solution is obvious: just turn the knob counterclockwise to open it.
  • Another possible cause of failure, but which in this case requires the use of tools, is closing the lock. To repair the fault, you must remove the plug and, inside, with an Allen key or the like, turn several times to the left.
  • The most common reason for a radiator failure is a possible obstruction, or the fact that it is the last radiator in the whole house, the one on the highest floor of the building. One possible solution to the failure, if the installation has a cabinet with the heating connections, is to check if a shut-off valve was not open.

In the event of a possible obstruction, one way to ensure that it is a fault with the radiator is to check that the pressure in the boiler is between 1 and 1.5 bar. Turn off all radiators except the damaged one, turn on the heater, and bleed it as much as possible. If it still does not heat up, it seems obvious that there is a blockage that will need to be unlocked.

The radiator does not heat up from below

 The lower part of the radiator, the bottom, is cold, the rest of the radiator is hot, and hot water reaches the radiator but is not circulating properly.

In this case, check if the closing shield is not closed. The locking shield is a key that sits on the bottom of the radiator, with a cover that shows a screw when removed. To open the lock, you need to turn the screw counterclockwise using a flat screwdriver or a Allen wrench.

If dirt is the root cause of radiator damage, make sure all radiators fail for the same reason, that is, if all installed radiators suffer the same dirt damage.