Baxi Solo 2 30Pf - Constantly Fires Up ! - Help Required

[alsimmo]

Hi Everyone - First posting so here goes - My Baxi Solo 2 30Pf constantly fires up and cuts out again every couple of minutes non stop when in operation ! I am having no problem getting enough hot water for my heating and water needs but the non stop firing up and cutting out gets on my nerves and cant be normal. Has recently had a PCB and ignition fitted (Im surprised the ignition hasnt burned out with amount it fires up ! Hope this makes sense - Any ideas will be gratefully received - Thank you

 

[twgas]

What's the boiler stat set to, could be that its lower than the cyl stat and so the cyl is calling all the time its on at the prog. if this is the case turn boiler stat up and see what happens.

 

[alsimmo]

What's the boiler stat set to, could be that its lower than the cyl stat and so the cyl is calling all the time its on at the prog. if this is the case turn boiler stat up and see what happens.

Just tried what you suggested Mick - turned stat on boiler to #6 (it was only on about 1.5) but to no avail - the burner just keeps cutting out then click.. click..click.. relights immediately then cuts out again then cycle commences again and again and again till it reaches temp - Thanks.

 

[twgas]

do you have a balancing valve on the HW circuit you can open a bit, sounds like you've not got good circulation.
Does it do the same when you are running the CH?

 

[alsimmo]

Hi Mick - Yes it does it on both settings HW & CH. Not sure if I have the balancing valve fitted - cant see anything in the Installation & Fitting Guide. This boiler is about 12-14 years old Mick and has given great service - Maybe its that time !

 

[twgas]

If it does it on both then, apart from it taking too long to heat up, I would say you've got; a) a partial blockage, usually, where the cold feed joins the system. or b) a worn out pump.

 

[baxpoti]

Check electrode lead is on TIGHT

 

[alsimmo]

Check electrode lead is on TIGHT

Hi, Just ensured that electrode lead was very tight - still same problem - main burner going out and relighting constantly - Thanks for your suggestion.

 

[twgas]

Does it cycle from cold or does the first firing last for some time, then start cycling ?

 

[shawd]

sounds daft but just change the pcb theirs nothing else on the boiler

 

[alsimmo]

Does it cycle from cold or does the first firing last for some time, then start cycling ?

Hi Mick,
Yes it does fire up first time from cold (every time) but after 20-30 seconds the main burner goes out then it relights again (first time no problem) then same again goes out and relights goes out and relights and so on ... Thanks

 

[alsimmo]

sounds daft but just change the pcb theirs nothing else on the boiler

PCB changed first off - Still same problem - Wouldnt think that both could have the same fault on them - Thank you

 

[Rob]

Could a faulty NTC cause this?

If not then possibly an air flow fault

 

[palerider45]

i would be checking fan and pressure switch, i had a similar problem with a baxi solo where this fault occurred and it turned out to be the restrictor disk at end of fan needing to be removed, this came from baxi tech help. im not saying do this but it sounds like the pressure switch maybe dropping out causing on/ off cycle. To go this far you will need to remove combustion cover which should be done by RGI, as any tampering could render the boiler dangerous

 

[baxpoti]

If not then possibly an air flow fault

Yes, I have had this before and it was an APS flue or fan related fault