New diverter valve. Boiler over heating

[trevorbayliss]

Can anyone say if the Descalers are ok to use or do I need a specific acid? Spirit of salts is online but I can get the descaler today

 

[kidgreen61]

We use brick acid, easilly available & does the job.
It's normally the primary side of the plate that blocks from the muck in the system.

 

[fixitflav]

I treated it before the diverter was changed on the day with spirit of salts. I guess I didn’t allow enough time to dissolve the line scale.

That's dropped in a bit late in the thread!
Is that what most people nowadays call hydrochloric acid? Are you putting it in the whole system, or somehow treating the plate heat exchanger alone? I'd be nervous about putting HCl into carbon steel rads. More common to use a proprietary descaler.

 

[DP]

Ok. Can you tell me what needs to be done on a service. I have it done every few years. Last done in jan this year. All engineers do is clean out the main burner. I’ve watched before and my burner is quite clean inside. Then it’s a new seal and that seems all they do.

I have a mag pro 2 filter as well so my system is pretty clean.

Pressurise expansion vessel, clear out condensate syphon, flue gas analysis. Tad surprise the burner is removed every year during service