Optimax he25s - Banging

[skaly]

Hi All I called to service ferroli he25s lpg, water pressure fine, i re charged expansion vessel, emptied condensate trap, co2 -10, o2-6%, co- 144ppm . When the boiler has been on for half hour it starts to make a banging sound every 5 or 10 seconds and a whine. ANY IDEAS .

 

[jtsplumbing]

If in hard water area could be scale build-up in EX or dirty system. are they on mains water or private supply ?

 

[skaly]

Its private supply pressure is good, i dont think it is a scale or sludge build up, When it has run for half hour during which i had it at max testing co2 its when it goes to low flame after modulating down BANG 5sec BANG with a whine sometimes

 

[stevetheplumber]

is there a way to set up min gas rate on these thats what it sounds like to little gas getting through causing exsplosive ignition

 

[skaly]

Not on this model on HE Plus 25s you can, I think you are on the mark it sounds like a good reason for fault.

 

[jtsplumbing]

Have you check'd working pressure (37mbar) is he on bottle gas ? could have dirty bottle, is this banging in boiler or is it ignition ? may be fault with gas valve have you spoke to Ferroli ?

 

[skaly]

Working pressure ok , Banging in boiler,

 

[jtsplumbing]

So boiler banging in EX ! could be small blockage causeing boiling or pump sticking not clearing heat away from boiler ,strange one, are you in hard water area ? also private water supply can cause some problems , boiler is set up to run on LPG ??

 

[skaly]

Spoke with ferroli they think the ex seal or pitted burner

 

[jtsplumbing]

Whats cost of replaceing both parts ? (Ferroli Recomend) against boiler replacement, or get Ferroli out on fix'd price repair ! sometimes this is best way to go

 

[skaly]

Its still under waranty so will hand it over to ferroli, Thanks for the help out its very usefull.

 

[jtsplumbing]

After they have been find out what fault was ! always handy for next time.

 

[skaly]

The customer is keeping me informed will let you know.