nightmare thermecon oil boiler

[ticha]

Hi

I need help I had a 40/60 floor mounted Thermecon oil boiler 2 and half years ago and it has never worked properly from the start.
The plumber recomended it because I have a 5 bed house. The problem is that I cant control the boiler with room stat to get heat on. When it does eventually come on ( sporadically) I only get heat upstairs. If I shut off the rad valves upstairs to get heat downstairs only two of the five get a little heat(total rads in house is 11). My plumber has been over 4 times in the past 10 days and replaced the pump still the problem persists on the last visit he admited he had no clue as to how to solve this(needless to say he is not returning my calls) with three young kids in this weather not ideal. Is there anyone out there who can advise the valleys are only going to get colder!!!!!!!!!!!!!!!!!!!!!!!

 

[Nixt]

Before anything else a 5 bed house would be too large for the 40/60 model unless all the rooms were matchbox size or you have the last word in thermally efficient house construction.

 

[Agile]

If its a cavity wall house with loft insulation it should be pretty adequate. About right if you insulate the cavity.

It sounds to me as if the rads are sludged up. Did the installer power flush the system before fitting the new boiler?

Its quite possible the system just needs some balancing.

Tony

 

[Nixt]

Agile the 40/60 is the smallest in the range. The OP said the installer recommended because of 5 bedroom house. When you consider that you would ideally need return temperatures above 60C to prevent back end corrosion would you choose the smallest output available unless you were completely sure of heatloss calcs ? OP needs to give description of house eg. is it detached, stone walls, single glazed etc or as Agile suggested.

 

[wilhelm]

I agree Nixt, 15 kw is not enough.

the op is jibberish anyway.

 

[ticha]

excuse the jibberish wilheim! My house is a 5bed end terrace, no cavity 50cm stone wall. Will have to check te size of boiler and will get back to you. system was flushed when new boiler was installed only 3 of the rads are over 3 years.

 

[wilhelm]

no probs mate.

Ive been brainwashed by things like this

 

[stardanny]

Agile the 40/60 is the smallest in the range. The OP said the installer recommended because of 5 bedroom house. When you consider that you would ideally need return temperatures above 60C to prevent back end corrosion would you choose the smallest output available unless you were completely sure of heatloss calcs ? OP needs to give description of house eg. is it detached, stone walls, single glazed etc or as Agile suggested.

Hi Nixt.
"When you consider that you would ideally need return temperatures above 60C to prevent back end corrosion "
Can you explain what it mean?

 

[Nixt]

Nothing - I made it up.

 

[ticha]

sorry all , 60/80 is the size of the boiler ! would that shift emphasis from the boiler

 

[Nixt]

Yes - Basically if the boiler fires and runs without going to lockout then your problems are elsewhere.

 

[ticha]

can you elaborate on lockout, because i have no cotrol of when it fires

 

[Nixt]

can you elaborate on lockout

It doesn't do that then.

 

[ticha]

what happens is the boiler fires when it feels like, I have loads of hot tap water shower etc but absolutely jack s heating downstairs

 

[Nixt]

Incorrect system wiring or faulty motorised valve. The boiler never fires when it wants - it can only work when external controls demand.