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Sime boiler problems


 
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mwillmroe

from United Kingdom

Joined: 13 Mar 2009
Posts: 3
Location: Hampshire,
United Kingdom

PostPosted: Fri Mar 13, 2009 2:29 pm Reply with quote

I am having problems with my sime combi boiler.
When ever I run hot water for more then five minutes, the pressure drops and the pilot light goes out.
However the pilot light does not go out if you have the hot water running and the central heating running at the same time.
I keep having to pump up the pressure on the boiler, but the pressure still drops?
Any ideas what the problem could be?

Many Thanks
M Willmore
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Agile

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Joined: 26 Jun 2004
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PostPosted: Fri Mar 13, 2009 2:34 pm Reply with quote

Everyone has problems with Sime boilers. They are not very friendly.

Its a slightly odd symptom you have and I suspect there are two faults.

However, it would be easier for us to do our guesses if you could tell us the exact model.

Tony
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gas4you

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PostPosted: Fri Mar 13, 2009 3:56 pm Reply with quote

Strange one, but from your post, it must be pointed out that you cannot have DHW and CH running together. A combi is either or.

I would 'guess' that if you think the ch is running as well, then the boiler has switched back from HW but as ch is on it is still heating the water somehow icon_confused.gif
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mwillmroe

from United Kingdom

Joined: 13 Mar 2009
Posts: 3
Location: Hampshire,
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PostPosted: Fri Mar 13, 2009 4:07 pm Reply with quote

The boiler is a sime friendly (i feel they could have chosen a better name).
Sorry if I wasn't very clear in my message, If I have the thermostat up high for the central heating and the hot water running I don't get the problem. But if I have the thermostat right down and the hot water running I do get the problem.

Many Thanks
Mark
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Agile

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PostPosted: Fri Mar 13, 2009 9:52 pm Reply with quote

Its still difficult to understand what you are trying to explain.

Please turn OFF the central heating..

Then see if the boiler fires up and provides hot water.

Then tell us!

I did say they are not very friendly!

Tony
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kev25v6

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PostPosted: Sat Mar 14, 2009 8:36 pm Reply with quote

Ive got the same boiler and had a similar problem with the pilot cutting out. When running the hot water it would run hot for a while then cold then hot again. When the tap was turned off the pilot would then turn off unless the CH was turned to on for when it switched back from HW to CH. Ive had new thermocouples, main board, thermisters fitted and no real difference until i had a new pump fitted and its been excellent ever since. It did help to turn the temp of the water dial down to about half and run the tap slower to keep the water hot enough while the problem was being sorted. There are a lot of things on these boilers that go wrong, ive had mine virtually rebuilt with new parts in the last three years.Mine is generally around 1.5 bar, rising to just under 2 bar when heating is on full.Never drops below what it was set at when cold though.I think a big drop in pressure means a leak somewhere.
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mwillmroe

from United Kingdom

Joined: 13 Mar 2009
Posts: 3
Location: Hampshire,
United Kingdom

PostPosted: Sat Mar 14, 2009 8:55 pm Reply with quote

Kev,
That is exactly the same problem I am having. Do you know how much it cost you to get the pump replaced?

Thanks,
Mark
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Slugbabydotcom

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PostPosted: Sun Mar 15, 2009 12:35 am Reply with quote

Quote:
Everyone has problems with Sime boilers. They are not very friendly.


Its not often we see Tony in 'make a joke' format














icon_redface.gif


Sorry I just couldn't resist icon_redface.gif
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Agile

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PostPosted: Sun Mar 15, 2009 1:07 am Reply with quote

If you look hard enough you can see at least one a day but many are read without being noticed!

I dont think the OP noticed that one.

Its hardly worth me bothering.
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Agile

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PostPosted: Sun Mar 15, 2009 1:09 am Reply with quote

Slugbabydotcom wrote:


Tony wrote:
Everyone has problems with Sime boilers. They are not very friendly.


Its not often we see Tony in 'make a joke' format


mwillmroe wrote:


The boiler is a sime friendly (i feel they could have chosen a better name).

Many Thanks
Mark



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kev25v6

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PostPosted: Sun Mar 15, 2009 4:38 pm Reply with quote

mwillmroe wrote:
Kev,
That is exactly the same problem I am having. Do you know how much it cost you to get the pump replaced?

Thanks,
Mark


New pump fitted was 120 quid all in. The original Sime pump as a whole is no longer made but an Ideal mp63h pump head fits onto the body of the existing pump, grunfos heads don't fit, they are slightly different.Can't say for sure it will fix yours but it was the last thing fitted to mine and the only thing that made it work ok. Its made the shower a lot more powerful too, so the old one must have been playing up for a while before it seized.
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pam123

from United Kingdom

Joined: 05 May 2011
Posts: 1
Location: London,
United Kingdom

PostPosted: Thu May 05, 2011 2:24 pm Reply with quote

mwillmroe wrote:
I am having problems with my sime combi boiler.
When ever I run hot water for more then five minutes, the pressure drops and the pilot light goes out.
However the pilot light does not go out if you have the hot water running and the central heating running at the same time.
I keep having to pump up the pressure on the boiler, but the pressure still drops?
Any ideas what the problem could be?

Many Thanks
M Willmore
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Agile

from United Kingdom

Joined: 26 Jun 2004
Posts: 52863
Location: London,
United Kingdom
Thanked: 3326 times

PostPosted: Thu May 05, 2011 11:01 pm Reply with quote

I dont know why Pam has quoted a posting from two years ago for no obvious reason!
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