Common LPG Boiler Issues and When to Call an Engineer
Is this an emergency?
If you can smell LPG gas (which smells like rotton eggs) immediately turn off your gas supply (if possible) and evacuate everyone from the building. Do not turn on any lights, torches or use any naked flames. The emergency gas number is 0800 111 999
No heat or hot water
Check that your thermostat is set to the desired temperature and heating mode. Verify the boiler is switched on. Check that the gas supply is not interrupted. If pressure is low, try repressurising using the filling loop (refer to your boiler manual before attempting this) and check for any leaks from radiators. If these steps fail, call a Gas Safe engineer.
Boiler making unusual noises
Occasional gurgling or crackling is normal. However, loud banging, kettling (a whistling sound), or persistent rumbling indicates a problem. These issues often relate to sludge build-up in the system, low water pressure, or air in the pipes. Call an engineer to investigate.
Water leaking from the boiler
Never ignore leaks. Do not attempt repairs yourself. This is an emergency - call a Gas Safe engineer immediately. Leaks may originate from loose joints, corroded pipes, a faulty pressure relief valve, or internal component failure. The engineer will identify the source and repair or replace affected components.
Pilot light going out frequently
Some older boilers have pilot lights that occasionally blow out if a draught is present. Check that nothing is blocking the boiler combustion area. If the pilot light goes out frequently, or if you smell gas, smell unusual odours, or see yellow flame colouration (should be blue), do not attempt to relight it. Turn off the boiler immediately and call a Gas Safe engineer.
Frozen condensate pipe
Modern boilers have a condensate pipe (usually plastic) that removes moisture. In extreme cold, this pipe can freeze, causing the boiler to lock out and stop producing heat. If your condensate pipe is accessible and clearly frozen, you may carefully pour warm water over the frozen section. However, if you are uncertain or the pipe is inaccessible, call an engineer. Ensure the pipe is insulated before the next winter to prevent recurrence.