Common Mistral Boiler Problems & Repair Advice

Common Mistral Boiler Problems & Repair Advice

Common Mistral Boiler Problems & Repair Advice

Boilers are normally extremely dependable appliances that we can rely on even in the darkest depths of winter. We trust them to keep out of the way and get on with their job of providing our homes with heating and hot water.

When they do experience a fault, it’s not long before everyone in the house knows about it and doesn’t know exactly what to do. To prevent panic setting in, we’ve put this guide together of the most common boiler problems, some of which you can take on yourself.

If you do need an engineer or are ever in any doubt at all, you should contact an engineer. With our service, you canrecieve free boiler repair quotes from reliable engineers near you.


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Who are Mistral?

For over 40 years, Mistral have been manufacturing a range of oil fired boilers for domestic and commercial settings right here in the UK. You can learn more about the range of boilers Mistral have available on Boiler Guide.

Top 5 Mistral Boiler Problems

  1. Smelling oil

    You shouldn’t be able to smell oil coming from your oil fired boiler, so you are then it probably means that oil is leaking somewhere. You should contact an OFTEC qualified engineer if this is the case.

  2. Burner not starting

    If your burner isn’t running or starting at all then there’s probably a block somewhere along the supply lines that’s preventing fuel getting into the tank.

  3. Smoke coming from the burner

    Seeing smoke coming from your boiler will be very worrying and could happen for a few reasons such as the air supply being restricted, a build up of dust or the tank is topped up with the wrong fuel.

  4. Radiators not heating up

    You might find that not all of your radiators are getting hot or that only the bottom section is heating up. This can be down to a number of reasons but the two most common are sludge or air build up in the system and unequal distribution of heat.If only the bottom of your radiator is getting hot, you may need to bleed it. This is fairly straightforward and doesn’t require an engineer (unless you don’t feel able to carry out the task yourself).

  5. Boiler losing pressure

    It’s important to keep an eye on your boiler pressure (you can do this by looking at the pressure gauge) because if it’s too low then your central heating won’t function properly. If the boiler pressure is below 1 your boiler probably has an issue, this can be caused by a water leak in the system, issues with the pressure relief valve, or because the radiators were recently bled.

Which Boiler Issues Need an Engineer?

If you’re ever in any doubt about what’s wrong with your Mistral boiler, get in touch with an OFTEC engineer as soon as you can but there are some faults you can resolve yourself. Use the table below to help you identify the possible causes of a problem your boiler is experiencing.


Need a boiler repair?

 

 


Problem Possible Cause Do you need an engineer?
No heat or hot water Broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels Yes
Leaking and dripping Most common cause is a broken internal component but it will depend where the water is leaking from Yes
Banging, whistling or gurgling noises A common cause is air in the system, alternatively it could be that the water pressure is too low or it’s kettling Yes
Pilot light goes out Could be a broken thermocouple which is stopping the gas supply Yes
Losing Pressure Could be a water leak in the system, the pressure relief valve needs replacing or due to recently bleeding radiators No, unless there’s a leak
No flame established (burner fault) Boiler failing to ignite or a nozzle is locked Yes
Thermostat issues Thermostat may be turned off or not set to the correct settings (time etc.) Consider replacing
Kettling Limescale or sludge building up on your boiler’s heat exchanger Yes
Radiators not getting hot Sludge or air build up in the system or an unequal distribution of heat You will need to bleed the radiators which doesn’t require an engineer unless you don’t feel like carrying out the task yourself.
Smell of oil Oil is leaking somewhere from your boiler Yes

Error Codes

Should your Mistral boiler experience a fault, you need to know what it means. Use our handy list of Mistral error codes to find out what’s causing the issue with your boiler.

Should You Replace Your Mistral Boiler Instead?

If you’ve had your Mistral boiler for a number of years, then you might want to think about having a new one installed as you could be saving up to £305* a year in a detached home. The table below shows you how much you could be saving depending on your current boiler rating and property.

House Type G (<70%) F (70-74%) E (74-78%) D (78-82%)
Semi-Detached £200 £140 £120 £120
Detached £305 £210 £180 £180
Detached Bungalow £155 £105 £90 £90
Mid terrace house £175 £120 £105 £105
Mid terrace house £95 £65 £55 £55

Who Should You Choose to Replace a Mistral Boiler?

When deciding who you’d like to install your new Mistral boiler, you will have the choice of a national company or local engineer. Both offer very good, yet very different benefits.

If you prefer service with a personal touch then a local engineer could be for you as you’ll probably be in communication with the same person from start to finish. They’ll also be able to offer pretty competitive rates which is always a bonus.

National companies might cost you a little bit more but you’ll have big brand protection and they can provide extra services like ongoing boiler cover.

To make sure you’re getting the best possible deal, it’s always a good idea to get quotes from 3 engineers rather than just the 1.

Considering boiler insurance after your boiler warranty has expired is well worth doing. Many offer annual services and safety inspections, they’re the ones you want to make a note of. While you could just take out boiler insurance with your energy supplier, there’s no obligation for you to do so.

Boiler Insurance and Ongoing Cover

Considering boiler insurance after your boiler warranty has expired is well worth doing. Many offer annual services and safety inspections, they’re the ones you want to make a note of. While you could just take out boiler insurance with your energy supplier, there’s no obligation for you to do so.

Mistral Boiler Warranty

Mistral’s range of condensing boilers come with 2 years of parts warranty and 5 years on the heat exchanger. Get more familiar with their warranties by reading our complete guide to Mistral warranties.

With our free service you can receive free quotes from trusted engineers near you, so send us an enquiry today.

*According to the latest figures from the Energy Saving Trust


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