Diagnose a radiator that isn’t warm enough

If all the radiators are working perfectly, but you are having issues with one, take a look at the following checklists:

Is the radiator valve closed?

The hand wheel valve through which hot water passes into the radiator may be shut; this can be opened with your hand. 

Is the radiator thermostat valve set accurately and working?

In the event that your radiator has a thermostat, ensure that the valve is not set too low. If the valve is defective, it is advisable that you replace it and drain off the central heating system.

Is the lock shield valve set correctly?

The lock shield valve is located at the opposite end of the radiator to the hand wheel valve. The lock shield controls high temp water stream into the radiator and may need an adjustment to enable more hot through.

 Do you think the valves may be blocked?

If they are full of limescale radiator valves may stop working. If this happens, you may need to flush out the radiator or the framework may need descaling.

If the radiator still isn’t warming up, taking care of the issue will depend on where it’s found.

In the event that the upstairs radiators in your house are cool, it’s a sign that the feed and expansion tank in your system has run dry. This typically indicates a bigger issue. Notwithstanding, it’s likewise conceivable that the ball valve in the tank isn’t working effectively; it might be blocked or stuck. 

Try the following:

  1. Clear all obstructions to the ball valve. 
  2. Refill the cistern, verifying there is sufficient space for the water to expand when the system warms up. 
  3. When the system is icy there ought to be simply enough water to make the ball buoy and switch off the water coming in. 

When you have major boiler or heating problems, it is strongly recommended that you seek the skills of a Gas Safe Register approved heating engineer.  Also, remember that all boilers and heating systems should be regularly checked and serviced by a professional.