The Potterton Profile is a very reliable boiler, but it does have some problems, mainly with the circuit boards and fans.
You may be experiencing the fan cycling on and off and then settling after a while.
This can be either the fan is running slow, not being able to operate the air pressure switch, the air pressure switch may be faulty or sticking, or most commonly a fault with the PCB 407677
If you have any questions regarding these problems or wish to order a part, please either e-mail us on sales@igniteheatingspares.co.uk, order the part from our online shop or give us a call on 01920 871711.