Scale build up problem in iron

opps sr 5900 2400 watt have mixed consumer confidence
http://www.productreview.com.au/p/sunbeam-ultura-sr5900.html

if the dial or iron wont heat up at all

most sunbeam irons have 12 month warranty
if less than 12 months old and you have the reciept
take it back for refund or exchange

if out of warranty toss in the bin...... buy a new iron

I have provided a link to a manual that seems to belong to your model. But unsure what features your model has. This is not available for some reason at the Rowenta USA website.
Refer page 7 of the manual available at this site
http://laundry.manualsonline.com/manuals/mfg/rowenta/1103898336__4605.html?p=1

Self Clean - prolongs the life of the iron
The Self clean function flushes dirt and scale particles
out of the steam chamber.
To operate:
• Fill the tank with untreated tap water up to the maximum
mark and heat the iron to max. temperature.
• Unplug from the mains.
• Hold iron over a sink horizontally, push the steam control
3 past the position and into the Self Clean position
and hold it there: steam will now begin to build up.
After a few seconds water and steam will emerge from
the soleplate, rinsing dirt and scale particles out of the
steam chamber.

After approx. 1 minute move the steam control slide to
the position.
• Insert mains plug and allow the iron to heat up again.
• Wait until the remaining water has evaporated.
• Unplug from the mains and allow iron to fully cool
down.
• When cool, the soleplate can be wiped with a damp
cloth.
We recommend using the Self Clean function approx.
Every 2 weeks. If the water is very hard, the iron should
be cleaned weekly.
Self Clean Valve
The self clean valve prevents the drip hole into the steam
chamber from furring or blocking up. To ensure the iron
continues to function properly, open and close the valve
by sliding the steam control to max then min a few times
after use.

Hi, Brown water and whitescale are often the result of the water you use in the iron... If you have scale, white vinegar will clean that... For brown water, empty the iron, rinse out the insides with bottled water, and then use the bottled water instead...

Also check out this tip...

Cleaninga Steam Iron White Scale and Brown Water

heatman101

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Periodic Descaling of the iron will help reduce this.
Mineral deposits in the water will remain inside the iron after being converted to steam. This builds up over time as scales unless cleaned.

For descaling instruction, refer to manufacturer.

You can use ordinary white vinegar. Use about 1/4 cup or so mixed with 2 cups water. Fill iron with this solution and operate it at full steam setting(high as possible) Set a folded towel(may want to use an old one)iron on the towel and operate the steam device until all the liquid is gone. This may clear some of the scale build up. There are Generic brands available at the stores made especially for irons, but vinegar is the most enviro friendly and is cheap.

Hi,

Here is a tip that will help you see why you are getting dirty water from your steam iron...

Cleaning a Steam Iron White Scale and Brown Water
http://www.fixya.com/support/r5300985-cleaning_steam_iron_white_scale_brown

heatman101

This will probably just need de-scaling. Buy some descaler and there should be instructions on the packet of how to de-scale an iron. Usually by warming the iron slightly, switching off, emptying out the water and then adding the diluted de-scaler to the iron and leaving it in an almost horizontal but raised position in a bowl or something so that some of the de-scaler will drain through. Then emptying out, re-filling with water and then iron something that you don't mind getting marked while any residue get's flushed out.

You can try this out, fill the Iron with a considerable amount of water, Switch On your Iron, Increase the heat controller Knob to the maximum so that the water boils and Place it Upside Down (As if you want to Iron) but dont let it touch the Pressing Table. Then keep pressing the button that disperses the steam until the whole water inside it finishes, repeat this same process over and over until it comes out clean...
(Alternatively however, you can just pour hot water though the water-inlet hole, and after a while, shake the iron and turn the water out upside down and let it pass out of the water-inlet hole...but please be careful with this second method though...because of the hot water)...hope it helps.

You're seeing hard water deposits and maybe a little rust. Use some CLR and pour in the iron and let it sit with it off. Shake it a bit and let it clean it all out, then rinse with clean water. (Vinegar will work too)

You should always usw distilles water in an iron. This prevents scale and crud from clogging up you water and steam ports. I hope this helps. Don't forget to rate my answer.