This poor boiler has seen better days. The heat exhanger has started to leak causing the burner to rust. This then caused other problems. It was replaced for a new boiler.
A blocked filter causing poor hot water flow.
A spider had blocked the air venturi within the flue system of the boiler causing the boiler to lockout on a fan fault. The spider was released back into the garden.
A blocked plated heat exchanger from a combi boiler.