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Mend Greenstar Water Low Advise

How can we top up the water pressure on a Greenstar 25Si?

We have a Greenstar 25Si/30Si. The water pressure guage is a little on the low side which means that we need to top up the water pressure. Can you advise us on where the filling link key fits in order to undertake this task. Thank you!

Ron Smith
January 2010
Many thanks, Paul F. Worked perfectly.

Tony H.
October 2012
Also having a Greenstar 25Si/30Si, i had the same dilemma as Ron ! I had been snown how to top up the water pressure by the service engineer a few months ago, but i had forgoten how to do it! The manuel doesn't cover it at all!!! Been surfing the net for an answer for the last 30 mins; Want to thank Paul F for his advice! was spot on!
Ian B

Ian B
January 2010
Remove the bottom plastic slide out cover of the boiler. The fill 'key' should be fitted to a stowage on the cover. On the underside of the boiler there is a squarish white plastic valve, then the fill loop opening immediately to the right (this is where you insert the 'key') and then a black plastic valve. Insert the 'key' into the vertical opening and turn the white plastic valve anti-clockwise until you hear water start to fill the system. Close the valve when you reach around 1 bar on the boiler pressure gauge. Remove the 'key' (there will be a little bit of water when you do this) and put the key and cover back into place.

Paul F
January 2010
Read your manual Ron...

J
January 2010
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Mend repair fix Greenstar home heating systems