Plumbing Problems in the UK? Ask a Plumber Now.
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?
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.