Microgenus 28HE MFFI

[Deelta]

Hi, the problem with the above boiler is the fan keeps running even when the timer off and ho DHW being drawn then it shows code E34, some times it runs alright, but 95% shoeing that fault, over heat stat ok, APS ok, fan and flue ok, what could it be?
many thanks

 

[45yearsagasman]

This fault E34 relates to air pressure switch not operated.

 

[Deelta]

This fault E34 relates to air pressure switch not operated.

hi, it looks you haven't read my message very well, the problem is not APS but the fan keeps running even when there is no call for CH/DHW.

 

[Gasman28]

This fault E34 relates to air pressure switch not operated.

hi, it looks you haven't read my message very well, the problem is not APS but the fan keeps running even when there is no call for CH/DHW.

What have you tested so far?
How did you eliminate the APS?

 

[Deelta]

This fault E34 relates to air pressure switch not operated.

hi, it looks you haven't read my message very well, the problem is not APS but the fan keeps running even when there is no call for CH/DHW.

What have you tested so far?
How did you eliminate the APS?

I replaced it with new one, checked the fan and the flue, even checked the overheat stat, as told by ariston

 

[Gasman28]

Is the boiler fitted outside or in the loft?

 

[Deelta]

Is the boiler fitted outside or in the loft?

in the kitchen, but why you asking does it make a difference?

 

[Gasman28]

Could be external fault

 

[Deelta]

Could be external fault

like what? mind some times it works

 

[numpty1]

Could be external fault

f33/34 is aps or flue fault

DILLIGAF I Want to be a builder

 

[Deelta]

Could be external fault

f33/34 is aps or flue fault

DILLIGAF I Want to be a builder

will all of you forget this E33/E34 codes and if you read what I'm saying you will see the fault is that the boiler runs EVEN WHEN NO CALL FOR DHW OR CH, Ariston told me if all ok then PCB problem so I just wanted to make sure if any of you had done this fault before