How to power clean my combi boiler????????

[shocksl]

Thinking of Power flushing to clean the inside of the boiler cus I'm getting intervals of cold water when i open hot water...

How would I do this with vokera unica combi boiler? which is this one. http://cdn0.vokera.co.uk/wp-content/uploads/2009/04/unica-he-installation-and-servicing-manual.pdf

Also what would I need?

 

[petertheplumber12]

It has to be reverse flushed flow is return, return is flow. I did it by disconnecting pipes from boiler with zero pressure, then connect machine and powerflush, then switch on machine with a cleaning chemical in it to reverse flush thro the boiler. if you can't do that then get some to do it for you. Don't switch boiler on because pump in boiler will go the wrong way.

 

[shocksl]

oh ok i didnt realise I need machines etc. I will probs need to get an expert to do it. I was under the illusion of thinking to put a solution in the boiler somehow and letting it run through pipes etc etc... but I have no idea in this subject at all!!!

How much would one of these machines cost? i might be an idea to purchase one if it costs less than someone else to do it for me. And I can try learning how to do it!

 

[Agile]

They mostly cost about £500-£1500 but you also need to learn how to use them.

Much of the skill is using the right chimicals for dealing with the problem.

Also best to properly diagnose the problem first!

Tony

 

[petertheplumber12]

They will charge you about £350, machine cost about £600 for a low grade one that doesn't get a lot of use.

 

[petertheplumber12]

They mostly cost about £500-£1500 but you also need to learn how to use them.

Much of the skill is using the right chimicals for dealing with the problem.

Also best to properly diagnose the problem first!

Tony

Yes and following on from Tony, it is probably cheaper to have a new heat exchanger IF that is the problem, and clean the system which caused the problem.

 

[Agile]

I would be checking the flow switch and sensor before getting involved in any water based work!

Tony

 

[shocksl]

can you tell me how to check the flow switch and sensor please... and thanks for the advice above guys... yur right changing it would be better than fixing it!!

 

[Ihavenojob]

If the heat exchanger is blocked,a new one will block up again unless the system is cleaned.For now I would fit a magnetic filter on the return pipe & you can use it to dose the system with a cleaning solution.