Hi guys hope you can help me on this frustrating problem that I came across recently.As I do maintenance and look afterpropertys for various people somebody asked me to have a look at their boiler while they are away cutting off after 10-15min I could not say no so I went there and found boiler lock out,I started a boiler everything worked fine and after 10 min flame went out I assumed it was thermistor so I replaced it but same thing happened again there was rambling noise from boiler so I moved to the pump which worked fine there was no a air lock either.Next day I called Corgi guy I know so after some starting and locking out he said that system is probably blocked therefore needs to be cleaned which he agreed to do it.After he cleaned system(370£)boiler worked for a little longer then same thing .He changed boiler stat ,gas valve ,pump (all paid promptly out of my pocket for now)but all again the same.After that he said change the boiler I was so ****** of that I called second Corgi that I know to get different opinnion so guy came and said exchanger I called owners(still away coming back in 10 days)and told them about this and up to date costs (900£)they where fine about spending 400£ more so I had exchanger cleaned fit it back same thing again I am so emmbarased by all this and just want to sort it out before they came back I think first guy took me for a ride but he will not any more as I know his true face now.Second guy said that the exchanger that I had took for a cleaning was not done properly and he suggest that they sometimes can not be discaled .I wonder is there something else to try before I go for the new one.Please any help more then welcome.
