Bosch Avantixx Washing Machine Not Draining

Hi,

I recently moved my washing machine out of storage after four years. It was working perfectly fine before it was put in storage.

At first, it ran it on a cycle and it kept coming up with an E08 error. After much troubleshooting and spending a lot of time watching the different cycles like hawk, I have narrowed the problem down to the following:

- the pump does not drain the water when the cycle hits the drain portion (there is no issue with filling the machine or the rinse portion of the cycle),

- when it hits the drain portion, the pump makes a crackly noise. I have checked the impeller when this happens and it is spinning,

- after pausing the cycle and manually draining the water from the front, re-tightening the filter cap and starting the cycle again, the crackly pump noise disappears and it is able to spin and drain the small amount of water during the spin cycle.

- I have manually tried a separate fill/rinse, drain (through the front) and spin cycles and they all work.

It seems to me that when there is a large amount of water during the drain part of a normal cycle, the pump is not draining for some reason and only drains when I have manually drained the water out and there is a small amount of water to drain during the remaining drain and the following spin cycle.

I have also tried spinning the impeller with my finger with the washing machine turned off and it spins with, what I've read, is normal resistance.

Any help would be appreciated. Having to set a timer to drain the water manually and then wait to restart the cycle is starting to do my head in. Thanks in advance.