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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 1561
Experience:  30 Years on the tools, now retired, Ex CORGI
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Error code A90 on an Ariston 32 HE boiler.... I've just

Customer Question

Error code A90 on an Ariston 32 HE boiler....
JA: How old is the appliance? Have you gotten error messages before?
Customer: I've just replaced the pcb. About 8 years old
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: The diverter valve also been replaced. I wasn't getting hot water. Heating was fine
Submitted: 1 year ago.
Category: UK Plumbing
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service! If you are a JA Member I would like to personally thank you and welcome you back! I am HVAC Guru an extremely experienced tech on the site and I try to get to as many customers as I can. NOTE it takes time for me to type research and add links so please wait for me to respond back I can only do this so fast. Secondly, I do not know your skill level so please try and let me know if I am going beyond your knowledge or comfort zone thanks! I strive for a 5 star rating from everyone especially our JA members.

A90 is not a valid code at all are you sure you have the correct PCB board? Also is the code for sure?

Customer: replied 1 year ago.
I know what I see. A90
Customer: replied 1 year ago.
There was a previous answer on JA referring to page 59
Customer: replied 1 year ago.
It's an Ariston 32 HE MFFI boiler
Customer: replied 1 year ago.
can you please confirm you are still dealing with my question?
Customer: replied 1 year ago.
it was the key
Customer: replied 1 year ago.
anybody there?
Customer: replied 1 year ago.
are we finished?
Customer: replied 1 year ago.
there is no longer an error code
Customer: replied 1 year ago.
I hope I shall not be charged for wasting my time
Expert:  alumalite replied 1 year ago.

Hello, if you are too upset to continue I will take a look at the situation for you.

I am in the business for 56 years so far, a retired mechanical engineer with a boiler license, I employed 27 people at the peak, but unfortunately not nearly as experienced it seems as the previous expert.

If you wish to continue i will pull the manual on the unit if its available and if not I will ask you to send me a photo of the wiring diagram, then I will mark it up with trouble shooting instructions.

Let me know if I should continue or not, of we do continue figure a few hours of trouble shooting on your end with my coaching worst case....I generally stay in tight touch with my clients, but there are delays as I juggle several questions at once.