Ways to Diagnose Central Heating Problems

Your radiators may be cold due to several typical central heating issues. It may seem obvious, but ensure your heating is on and the room thermostat is set to the heating position before proceeding. It’s understandable to panic when your central heating stops working, but keep cool and conduct a few quick inspections before summoning the troops. 

Our advice on typical boiler issues can also be helpful to you.

Always consult a professional from Central Heating Repairs West London when in doubt because diagnosing central heating issues can be challenging.

Ways to Diagnose Central Heating Problems

Refer to the below details as a diagnosis of your central heating problems.

  • Check the thermostat

Make sure the temperature is manageable by checking the thermostat. The boiler will operate only if the heating is raised above room temperature.

  • Verify the timer

The majority of timers come with four settings: off, continuously on, on all day (often known as once), and timed, which can be 2, 3, or more times per day. Please verify that the heating turns on when you want it to and that you didn’t mistakenly set the timer for 4 am rather than 4 pm.

  • Check the pilot light

Verify that your gas boiler’s pilot light is still on. If it has, there are typically directions on how to relight it inside the boiler door or on the front of the boiler.

Call Central Heating Repairs West London and the Register engineer if these steps cannot resolve the problem.

Steps to Diagnose Central Heating Problems

  • Upstairs radiators that are cold

In most cases, empty feed and expansion cisterns are indicated by cold radiators in the upstairs area of your property. Normally, the tiny tank called a cistern is located in the loft. The cistern must be refilled if it is dry. Tap the ball valve to refill the cistern. The water should start filling the cistern and stop once there is enough water to float the ball valve.

The water has to have room to grow, so fill it only some of the way up.

The damaged radiators need to be bled after the cistern has been filled. Over the next few days, check the overflow to ensure the ball valve is functioning properly.

  • Downstairs chilly radiators

There may be an airlock in the system, so if turning off the upstairs radiators doesn’t help your downstairs radiators heat up, your pump is probably faulty or nearing failure. You’ll need to enlist the assistance of a skilled plumber.

In the winter, cold radiators can cause pipes to freeze or burst. Therefore, they need to be addressed very once.

  • Cold radiator head

This most likely indicates that the system contains air. For the trapped air to be released, you must bleed the radiator.

  • Cold radiator in the center

This could indicate that rust or sludge buildup prevents water from passing through the radiator.

  • A central heating system with airlocks

In some circumstances, more than one radiator is likely affected by air in the system. Your radiators will alternatively turn chilly as air locks circulate throughout the heating system, which will let you know when it’s happening. Before contacting a professional, try bleeding the radiators. 

  • Shut off the valve

Since each radiator heats up in turn, those closest to the boiler are frequently the warmest. The lockshield valve on those radiators can be partially closed to let more hot water flow to the radiators farther away.


Call professionals from Central Heating Repairs west London if your boiler or heating is experiencing a serious issue. Always remember that expert maintenance should regularly be performed on all boilers and heating systems. If you require a one-time repair, you can rely on the knowledgeable repairs team to have everything up and running in no time.


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