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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 2708
Experience:  30 Years on the tools, now retired, Ex CORGI
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Hi, my ferroli optimax HE 18S boiler displays the fault code

Resolved Question:

Hi, my ferroli optimax HE 18S boiler displays the fault code A3. the manual tells me to check the flow sensor but doesn't tell me where this is or what it looks like?

The pressure gage is fine, it is about 1.2 bar.
Submitted: 5 years ago.
Category: UK Plumbing
Expert:  Rick Ridley replied 5 years ago.
Hi I am Rick, UK Plumber, and I specialize on Boiler problems, it is top left of the heat exchanger, is you have the manual it is marked 278 on the drawing, Rick
Customer: replied 5 years ago.
So as this is inside the boiler should I look myself or call an engineer? Do you know if there is a way to fix fault code A3 and get it working again myself?
Expert:  Rick Ridley replied 5 years ago.
No I think you will need an engineer the sensor is probably faulty and will need replacing, Rick
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