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  1. G

    worcester hi flo 400 rsf

    hi changed the diverter valve today and seals noted a black chalky substance in pipes .Have managed to cure the noise but rads still getting hot when useing domestic hot water i guess that the heat exchanger is partialy blocked. can any one advise best way to clean out without totaly stripping...
  2. G

    worcester hi flo 400 rsf

    dear all my6 year old boiler has developed a fault that when the hot water is in use the radiators upstairs also get hot and there is a strange crackling noise from the boiler. I have assumed that the diverter valve may be faulty but would like advice, Thanks :?:
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