vokera linea 24 cleaning

dope · 8 Nov 2006

what is the best thing that i can use to clean the system of my combi boiler, and how do i go about doing it?

cheers

scatmanjohn · 8 Nov 2006

Just read your other post again.

So when you run a tap the display is reading approx 65 degrees?

Is the water coming from the tap only luke warm?

I'd be looking at the hot water thermistor.

dope · 8 Nov 2006

the water is only luke warm, i have replaced the thermisters already but has not solved any problems.

Strachan · 8 Nov 2006

Turn down the supply from the mains cold water via the stopcock, watch the temperature guage, it should increase as the less flow through the heat exchanger allows the water to absorb more heat from it. If this happens you need to remove the plate heat exchanger and either chemically descale it or replace with a shiny new one! On a 24 the hot water flow rate won`t be much to shout about anyway.

scatmanjohn · 8 Nov 2006

Strachan said:
Turn down the supply from the mains cold water via the stopcock, watch the temperature guage, it should increase as the less flow through the heat exchanger allows the water to absorb more heat from it. If this happens you need to remove the plate heat exchanger and either chemically descale it or replace with a shiny new one! On a 24 the hot water flow rate won`t be much to shout about anyway.

BUT... the boiler thinks the dhw is 65 degrees. (which is too hot anyway)

In hw mode it checks the resistance of the DHW thermistor.

When the water to water heat exchanger is sludged up the primary water gets too hot and the high limit stat kicks in.

Primary water on this one is only getting to 75 deg.

Strachan · 8 Nov 2006

Going on my own linea 24 that did the same thing 3 months ago. Went down the thermistor road to no joy. Replaced the heat exchanger as mine was blocked with hard scale. Cured my problem though. The overheat stat never cut out on mine which as you rightly say should have happened with resticted flow. It was one of those things that happens, fixed it, don`t know exactly how, but it`s fixed.

dope · 8 Nov 2006

so what do you suspect then?

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vokera linea 24 cleaning

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