Bosch washer dryer WVG3046SGB dryer issue

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Bosch WVG3046SGB washer dryer expelling grey/white debris on drying

The problem

On the drying programme, the Bosch WVG3046SGB immediately blew white/dark grey gritty debris into the door gasket. The top cover was removed and white furry powder was seen around the fan housing. The machine had recently been acquired and may not have been used for some time.

Likely cause

The accepted reply said the material most likely was dried lint or accumulated residue within the dryer system. No strip-down diagnosis or confirmed component fault was provided.

What fixed it

Clear away as much of the debris as possible manually, then run several drying cycles to try to purge the remaining residue. Also run a few 60°C wash cycles to help clear the machine. Keep the cold water supply turned on during drying, as noted in the discussion. The exact repair was not confirmed.

Checks to try

• Observed white/dark grey gritty material blown into the door gasket on starting a drying cycle
• Top cover removed and white furry powder noted around the fan housing
• Run several drying cycles to see whether the residue clears
• Run a few 60°C wash cycles
• Check that the cold water supply is left on during drying