What to check if a boiler is working but the water temperature is low?

If an oil boiler is working but the water temperature is low, a heating engineer should check the following. Please note, it is important to always isolate the electricity supply to the boiler before working on the boiler.

  • Check if the nozzle is undersized nozzle and/or low fuel pressure.
  • Check the condition of boiler's heat exchanger and clean if necessary.
  • Check the boiler thermostat.
  • Check the combustion settings.
  • Check the condition of the fuel filter.

Find Technical Specifications

Download product brochures, data sheets and installation manuals for all of Grant's oil boilers and renewable technologies.

Find technical specs

Home Heating Blog

Discover more about home heating solutions, care and support with our informative blogs

Read more

Couldn't find what you were looking for?

Alternatively you can speak to a member of our team - Subject to Operating Times

Return to top
Are you a homeowner? Please click here.