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Ideal S28 boiler diagnosis req'd

1norab Posts: 11 Forumite

18 June 2008 at 5:26PM in In my home (includes DIY) MoneySaving

Hi, My boiler is an Ideal S28 system boiler. My problem is the DHW isn't working, CH is ok.
With the help from some good advice from this Forum and detective work I have found the problem but...

With CH on, call for DHW and the boiler shuts down. If I call for DHW alone, the pump/fan and Motorised valve kick in but just as you think the boiler is going to fire up, it doesn't.
I have removed the flow switch and when i manually press the switch the Boiler fires up in all 3 positions (CH/DHW/CH+DHW).
With the switch back in it's place, I watched the pin protrude from the diaphram in all 3 positions... call for CH = protrudes 11mm. Call for DHW = protrudes only 8mm. CH on, then call for DHW the pin retracts back (3mm) to 8mm.
The pin disengages from the switch when DHW is called to join the CH. The pin doesn't reach the switch when only DHW is called.
What is causing this to happen. Any advice or suggestions would be most welcome.

This discussion has been closed.

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