Is your pilot light going out?

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Is your pilot light going out?

Worcester Bosch Boiler Installation in Milton Keynes

A pilot light is a small device that emits a blue flame in which is also part of an old model furnace or water heater. It provides the flame that is needed to start and maintain the fire that is produced in the boiler. The problem is, if the pilot is faulty or goes out from time to time, the boiler won’t ignite and the gas would keep on coming out of the gas tube which poses a danger. It could accumulate and possibly explode inside the house. This is when we realise the situation needs to be addressed with some urgency.

Causes as to Why Your Pilot Light Keeps Going Out and How to Fix it

Cause: The pilot is dirty

The pilot might be already covered in dust and soot. It is an accumulation of carbon deposits that collect inside the tube and the thermocouple which incidentally is a safety device that regulates the supply of gas to the furnace.


1. First, turn off the gas and remove the pilot light tube and thermocouple from the furnace.

2. Set them on a piece of cloth and use a rag or wire brush with soapy water to clean both items. You may also use a needle to poke the “orifice” of the pilot to remove anything that might be blocking it.

3. Reassemble both the pilot and thermocouple back to the furnace.

4. The resulting flame must be blue with a white center on it.

Cause: Gas valve problem

Possibly, the valve may be worn out or water damaged. If it is electronic then the problem could also be an ignition component or some glitch in the safety circuit which is the reason the boiler won’t fire.


1. It would be a good idea to contact a certified contractor who is an expert on the type of boiler that you currently have.

Cause: Expired or a bent thermocouple

An old thermocouple might be malfunctioning for the reason that it may already be worn out. Or, might just be bent away from the flame which results in the boiler not turning on.


1. Wait for the thermocouple to cool down and bend it back to where it can reach the flame. 2. Replace the thermocouple.

Cause: Seals are faulty or not working properly

Seals should be able to form a complete cover to any crack or edge that needs to be addressed. If not, then it could be the problem.


1. Replace the seals.

Cause: Bad gas regulator

A regulator that may have gone bad which is usually located outside of your house could be the culprit. Your furnace might not be getting enough gas which could be the reason for the boiler not working.


1. Contact your local heating repair company to address the problem. Avoid DIY on gas pipe issues.

At Grand Union Plumbing & Heating, we like to keep our clients happy with our great service and skilled workmanship. When it comes to taking care of your boilers, we are first-rate in servicing, installation, and repair of all types of boilers and heating systems. Our heating engineers are more than ready to serve you on a year- round, any day call out, even on a short notice.

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We are available in the Milton Keynes area at a fixed call out fee.

Are you a landlord looking for a plumber?

If you’re a landlord and you need experienced and swift action taken to replace an old cranky boiler, please don’t hesitate to give us a ring on 01908 034194. We’ll work quickly to get the problem resolved and keep your tenants happy.

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Areas we cover

  • Aylesbury
  • Bedford
  • Leighton Buzzard
  • Northampton
  • Olney
  • Towcester
  • Woburn Sands
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What Our Customers Say

I’ve used Grand Union 3 times and every time the service is excellent and the price very reasonable. Engineers are very good at letting you know what they are doing and there are no hidden charges. They even managed to do a job at short notice. They work tidily and even followed up with a message to check my heating was still ok the following day. Highly recommend

Claire Edwards

Excellent service from Mitch!
Responsive, courteous and informative.
Work swiftly done too, with clear explanations throughout.
Thanks again, Mitch.

Used grand Union plumbing to service my boiler and couldn’t of asked for a better service. They were on time and actioned the job in a clean and professional manner. Very nice to see they were operating in a covid secure manner without being promoted too

100% will be used again in the future

Tom Holland
Highly recommend Grand Union Plumbing & Heating. We called Mitch after getting nowhere with the first 2 heating engineers we contacted. In contrast to them, Mitch quickly diagnosed the fault, ordered the part and replaced. Totally professional and good value for money.
Mike Kennedy
I found Grand Union on local heroes. Id given up on British gas and NPower/homeserve.
Mitch was honest from the get go. Came round and gave me quote got the worl done within a couple of days once parts came.
Very highly professional. Very friendly. Perfect on time. Clean. Safe. What else can I say. I will be using only Grand Union here on and cannot recommend enough.
Amazing service Mitch Andy and Cory all amazing guys came out Xmas Eve went above and beyond to get me sorted and were amazing with my children letting them watch and so polite couldn’t recommend highly enough 10/10
Steaves Jen
Highly recommend the team to fix any plumbing or heating issues. They arrived as scheduled and it was great to have such a high standard of service. Will definitely be my contact for anymore plumbing issues and for boiler services.
Owen Thomas
Contacted them after having three boiler services being cancelled by a Big Five company only resulting to a wait till May for the 4th appointment. From the first day I contacted them Andy came around in a week’s time and provided excellent customer service and serviced our boiler very efficiently and quickly. The appointment ran a bit late due to another emergency call but both Mitch and Andy were apologetic and polite. Appreciate there excellent customer service on top of a job done well. Will be calling on them in future again for sure. Thank you.
Kaanita Khan
Would highly recommend Grand Union plumbing, really knowledgeable team. They were able to identify the problem with our heating pressure gauge, and release valve really quickly and stop our leak straight away. Thanks
Emma Thompson
Love these guys, have been using them for years and will keep using them for years in the future. They’re helpful, do amazing work each and every time, and are respectful of your home, both Andy and Cory took their shoes off when they came into the house recently, Cory put down dust sheets when he was fitting my new radiator in the bathroom (tiled floor wipes clean, but still put it down).
100% recommend them for any and all plumbing works and looking forward to having them do more work for me later in the year.
Ian Kockelbergh

It’s not very often that you find a quality tradesperson who is reliable, honest, and competitive on his pricing. Mitch has done a number of jobs in our house, including installing a new boiler, water tank and radiators. All to a brilliant standard. I will happily recommend Mitch and Grand Union Plumbing!


I have called Mitch out twice since moving into our new house a month ago. Both times he has managed to fit in an appointment fairly quickly to resolve our issues. He has been professional and friendly, offering advice on other issues that I have seen. I would definitely recommend his services.

Simon Edwards

We have used Grand Union Plumbing several times as we had a really tricky fault. We found Mitch to be really excellent. Very happy to recommend, 10/10

Annette McDade

Called Mitch out on very short notice, extremely reliable and great rates, would highly recommend Grand Union Plumbing and Heating. Also provided advice with other queries aside from the job at hand- with no reluctance. Great service, thank you for your hard work and honesty Mitch.

Dushan Gnanakumar
Great service, polite, attention to detail. Would highly recommend.
Ajvinder Dhatt
Had a leak that needed fixing asap and Mitch gave me advice over the phone to deal with it until he could get to me, then came out within the hour on a weekend! Would highly recommend
Hannah Manners
Great company would highly recommend for any heating & plumbing issues
Terry Adolpho

Definitely recommend these guys. Had a job done by them and they wasted no time to get it done and made sure I was completely happy before any payments. Nowadays companies just want to rush and take your money. Big thumps up

Tevaugh Grant
We always use Grand Union for serving and any other unforseen problems. The service and professionalism is 1st class. Would definitely recommend!!
Stephanie Horne
A great company to do business with… I used them recently for an emergency with a domestic heating system which was rectified very efficiently. A second problem (some months later) and there was no decision to make, called them and they sorted it in no time with minimum fuss, mess and very reasonably priced.
Trevor Gordon

Have used Grand Union twice now. They are very quick to respond to enquiries, reasonably priced, tidy workers and very friendly. I can’t fault them. Definitely my go to guys now for any plumbing needs.
Highly recommended

Emma Verrall
Great service from Mitch. Have used a few times for boiler service, repairs and outdoor tap installation. Always very prompt service, turns up on time and reasonable prices. Would definitely recommend!
Jon Hood

I found Grand Union Plumbing through the Gas Safe Register. I had a boiler service and gas safety certificate. Mitchell was very professional and the prices were very reasonable. I would definitely recommend and use again.

Rebecca Hughes
Mitch was very helpful when fitting my new boiler – he was very fair about price and I couldn’t recommend Mitch enough. Thanks Mitch!
Reece Hussain


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