Why does my oil boiler smell?

A persistent smell of heating oil, smoke or combustion fumes is not something to ignore. A brief faint smell may occur after an oil delivery or maintenance visit, but continuing odours around the boiler can indicate a leak, incomplete combustion or a flue problem.

What the smell may indicate

• Heating oil leaking from a filter, valve, pipe, burner or tank connection.
• Oil spilled during a delivery or previous maintenance work.
• A burner failing to ignite cleanly or repeatedly locking out.
• Soot buildup or poor combustion.
• A damaged, blocked or incorrectly operating flue.
• Exhaust gases being drawn back toward doors, windows or air vents.

What to do

If the smell is strong, there is visible oil, smoke or soot, or anyone feels unwell, switch the appliance off if it is safe to do so, ventilate the area and move away from the source. Do not operate electrical switches near a significant oil spill and do not attempt to restart the burner repeatedly.

Do not remove burner covers or adjust combustion settings. If oil is escaping from the tank or supply line, contain it only if this can be done safely and contact an appropriate oil engineer or spill response service promptly.

How the fault is checked

An engineer may inspect the tank and oil line, filters, burner seals, nozzle, ignition, combustion chamber and flue. Combustion testing is important because a boiler can appear to run while still burning incorrectly.

Oil boiler inspections in Gloucester

Gloucester Oil Burner Services can investigate oil smells, soot, lockouts and burner faults across Gloucester and nearby Gloucestershire areas.

Oil boiler repairs | Oil burner fault finding | Annual servicing

Call or WhatsApp 07725 972140.

No hot water from an oil boiler quick checks

If your oil boiler is running but you have no hot water, the fault can be simple, but it can also point to a burner, controls, pump or hot water cylinder problem. This guide is for homeowners in Gloucester and nearby Gloucestershire areas who want to make a few safe checks before booking a repair.

Quick checks before calling an engineer

1. Check the programmer or timer. Make sure hot water is switched on and that the clock has not reset after a power cut.

2. Check the cylinder thermostat. If you have a hot water cylinder, the thermostat may be turned down or not calling correctly. Around 60C is common for stored hot water.

3. Check the oil level. If the tank is low or has run out, the boiler may lock out and need proper bleeding and recommissioning.

4. Look for burner lockout. If the red lockout light is on, try one reset only. If it locks out again, stop resetting it and call an oil boiler engineer. Repeated resets can make the fault worse.

5. Check whether the heating works. If the radiators get hot but the hot water does not, the fault may be with a motorised valve, pump, thermostat, programmer or hot water cylinder controls.

Common causes of no hot water

No hot water from an oil boiler can be caused by a faulty programmer, failed thermostat, stuck motorised valve, worn pump, airlock, blocked filter, dirty nozzle, photocell fault, poor combustion or burner lockout. Older systems can also suffer from wiring centre faults or cylinder coil issues.

When to call for help

Call an engineer if the burner locks out again after one reset, the boiler smells of oil or fumes, there is soot around the appliance, the boiler is noisy, or the hot water keeps cutting out. Do not remove the burner cover or adjust oil burner settings yourself.

Gloucester Oil Burner Services can help with oil boiler fault finding, oil boiler repairs and annual oil boiler servicing across Gloucester, Tewkesbury, Stroud, Cheltenham, Forest of Dean and nearby areas.

Useful pages on this website

Oil boiler repairs
Oil boiler service Gloucester
Oil burner service and repair Gloucester

Need help with no hot water from an oil boiler. Call or WhatsApp Gloucester Oil Burner Services on 07725 972140.