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Heatslave 15/19 Oil Boiler Hot Water on Demand Issue

Discussion in 'Plumbing and Central Heating' started by Extooth, 25 Apr 2018.

  1. Extooth

    Extooth

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    Hey all,

    I've had the plumber in numerous occasions now to fix this boiler.. Several things were wrong, and at this stage, the diverter valve and expansion tank were fully replaced. The boiler has been going well for a few months, but now another problem has emerged. Was wondering perhaps if its DIY-able.?

    Basically, calling for heat and hot water work as they should. But as i understand it, the boiler has always given hot water on demand - washing hands etc, even when there is no call for it. Currently, this rarely happens anymore. I've noticed the hot water on demand to be much better on a day where the boiler has been working at some point during the day, but even then it can be sketchy. Is there anything I can do to fix this myself, or should I give the plumber another buzz?

    Thank you!
     
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  3. oilhead

    oilhead

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    Location:
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    You need to establish whether the controls are working. Firstly, is the programmer feeding the DHW heatstore stat?If so, is the dhw stat working, i.e is the heatstore hot?. If so, when you turn on the tap, does the pump start and the burner fire? If yes, then is the flow pipe from the heatstore to the dhw heat exchanger hot, if yes, is the outlet dhw hot? Is there a significant difference between the flow from the cold water and the hot water? If yes, then DHW heat exchanger could be scaled up.
     
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