- No heat or hot water – could be broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels.
- Leaking and dripping – a variety of issues could cause your boiler to leak water. It will depend on where the water is leaking from to determine the cause.
- Strange banging, whistling or gurgling noises – air in the system is a common cause, alternatively it could be that the water pressure is too low or it’s kettling. Pump failure, particularly in older systems, could also be responsible for strange banging noises.
- Pilot light goes out – could be a broken thermocouple which is removing the gas supply to the pilot light, a draught blowing the pilot light out or a deposit build up in the pilot light.
- Losing pressure – a water leak in the system is the most common reason for a loss of pressure. But it could also mean that the pressure relief valve needs replacing.
- Frozen condensate pipe – thawing a frozen pipe should ideally be done by a qualified engineer.
- Thermostat issues – if the thermostat is losing accuracy or turning the heating on/off when it’s not supposed to, it might be time to invest in a newer, more energy efficient one.
- Radiators not getting hot – corroded pipework can cause sludge to gather in the system, preventing the free flow of hot water to the radiators. Chemically cleaning or flushing the system will remove these deposits.
- Boiler keeps switching itself off – could be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, air or the pump not circulating the water in the system properly.
- Kettling – hearing a strange rumbling noise? When limescale builds up on your boiler’s heat exchange you get kettling.
Typical Boiler problems
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