Did you know your gas boiler is most likely to have a problem during the Autumn? This is due to your central heating system being inactive during the summer months. Although we know whenever the time of year that a boiler failure occurs, it is never ideal and causes inconveniences.
#1 Fan fault
Do you have an error fault code showing on your boiler? If so, it’s likely that your boiler’s fan has developed a fault. Your boiler’s fan is a critical component, as it pushes harmful gases through your boiler’s flue and out of your home. If your fan can’t do its job, your boiler’s circuit board won’t allow the boiler to turn on. Your fan’s fault has probably been caused by the windings on the motor burning out or the bearings having deteriorated. The cost of a replacement fan will vary, depending on the model of your boiler. But you can expect to pay between £100 and £200 for the fan, plus approximately the same again for a boiler engineer to fit it.
#2 Circulating Pump
Have your radiators suddenly stopped working, has your boiler become noisy or are you experiencing a leak from below your boiler? If so, it’s possible these issues are caused by a problem with your central heating pump. Your heating pump is the heart of your system — taking hot water from your boiler and pumping it around your pipework — so, if it stops, no hot water and no heating. Many things can cause a pump failure, from the propeller on the pump getting blocked with dirt to air getting stuck in the pump causing an air lock. It’s likely to cost around £120 for a replacement pump, plus the cost of a boiler repair engineer to fit it.
#3.Diverter Valve or Motorised Valve
Are your radiators not heating up? Have you found yourself with no hot water? If so, it’s possible your boiler’s motorised valves have failed. Your lack of hot water and heating could of course be caused by other problems with your boiler, including a drop in your boiler’s pressure. So, before you call out an engineer, it’s always a good idea to check your boiler’s pressure is between 1 and 1.5 bars on the pressure gauge. Like any moving part, the motorised valve in your boiler is subject to wear and tear. Replacing the motorised valve is a major job, as your heating system will need to be drained to remove and replace the part within the boiler. Expect to pay approximately £100 for your replacement motorised valve and for the boiler repair engineer to fit it.
#4 Printed Circuit Board
Has your boiler lost power, is it working sporadically or are lights flickering on the display panel? If so, it’s possible the circuit board has developed a fault.
The loss of your boiler’s power could also be caused by a blown fuse in the boiler, so this can be checked first. Although if the fuses are all fine, you’ll probably need a replacement circuit board.
Your circuit board failure could be caused by many things but having a leak in the boiler or the circuit board developing a crack are among the most common. Depending on the type of boiler you have, a replacement circuit board is likely to cost up to £250, plus the cost of a boiler repair engineer to fit it.
Has the pilot light on your boiler gone out? Will your pilot light not stay alight? If so, it’s possible you could be dealing with a broken thermocouple. If there is a problem with your boiler’s thermocouple, your boiler won’t turn on for safety reasons.
Your broken thermocouple is likely to be caused by metal fatigue. This will be largely due to its age and the changes in temperature it’s been exposed to over time. The continuous expansion and contraction of the metal causes the thermocouple to become weak and potentially fail. Although a replacement thermocouple is an inexpensive part, the cost for a boiler engineer to fit it is likely to bring your boiler’s thermocouple replacement to approximately £150.
These are our top 5 although there are many more faults / problems which could be a problem. At Video Plumbers with our experienced boiler engineers we can have a good idea on a video call if one of these 5 faults are the issue although there is a possibility you could need a hands-on plumber to confirm the diagnostic. The good thing is that if diagnosed by Video Plumbers it would be for a fraction of the price or at least you would have a very good idea at what you’d be looking to pay for the necessary works. For further works AS Plumbing and Gas can undertake repairs on all models of gas boilers.