Secondary heat exchanger cleaning

[markadams]

Has anyone tried to clean a partially blocked secondary heat exchanger using system chemicals instead of removing and acid cleaning or replacing it.

Got a vokera procombi 85 he which goes cold unless the flow is very low.

 

[townfanjon]

Dont think you can pal .
Take them off and clean them , brick acid , spirit of salts etc etc .

 

[Aire]

Depends on whether it's the heating side sludged up or a scaled up hot water side. I've always had good results using fx2