Grant Vortex 26 boiler issue of short cycling

Hi Guys,

My two years old Grant Vortex 26 boiler is facing a problem of short cycling. The boiler is firing up for almost half minute & afterwards it cuts out badly. The most annoying thing is the radiators, which are barely getting the Luke warm water & same goes for the hot water. What is wrong with the boiler? Someone please help me

Thanks a lot


Hi Dave,

As the minimum range of the boiler’s firing and boiling, goes beyond the current load of the system then, it will surely become the reason the boiler’s short cycling as it forces your boiler to instantly fire up just for the few seconds. Well, you can rectify the problem by simply checking the below-mentioned things:

  1. Firstly, you have to check the proper grounding of the Grant boiler
  2. Secondly, you can face this issue whenever there is the air in your boiler so do check for the current amount of the air
  3. Check the existing & right water flow in your boiler
  4. Check the blocked air inlet on the concentric system of venting

Feel free to call a Grant boiler engineer if your problem persists