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.

Any questions?

If you are looking for a heating engineer within the Milton Keynes area for anything from boiler installations to fixing a tap, or would like some friendly advice please call Mitch directly today on 01908 034194

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Areas we cover

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

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!


Very happy with the service I have received, the service was prompt, efficient and professional. Yes, I would use again.

Clare Price

Amazing work and attention to detail and Mitch is a great person to work with

Made in Sud Pizzeria

Very friendly service. On-time and very professional. Also very careful about safety during the current COVID outbreak.

Andrew Robinson

Mitch is super friendly and professional, happy to give advice and he’s done loads of work for me.

G Man

Highly recommended, would use again

Mandi Willett

Highly recommend Mitch. Polite, professional, on time. Great service.

Susan B

Mitch replaced our boiler and ran new pipework, plus relocated some radiators. He did a brilliant job and I wouldn’t hesitate to recommend him! He was punctual, helpful and polite.

Suzanne Simmons

I had a new bathroom fitted by Mitch. He was absolutely excellent. He was polite, tidy and did an exceptional job. Reasonably priced too. 100% recommend.


Excellent service. I contacted them for a boiler repair. They responded within hours with prices. Once they confirmed part availability, they fitted within days.  Very efficient, great service and I liked their clear pricing.

Definitely recommend & I will be booking my annual service with them in future.

Well done!

Sheena Mac

Grand Union replaced our central heating system and in doing so we requested that it be relocated from the airing cupboard into the Garage.  The work was completed professionally & on time with the relocated pipework like a work of art, very neat and orderly.  I would have no issue with recommending Grand Union, and will certainly be using them for all our gas & plumbing needs.


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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