Can I clean the old one?

Rinse and refit if the trap body is undamaged, but always fit new seals.

22 mm external pipe rule?

Yes — post-2018 the run outside the wall must be 32 mm insulated per BS 6798.

Only if the Worcester Bosch Greenstar 8000 Life 30 is in warranty — Worcester Bosch require log of any part swap for labour claims.

Renew the internal condensate trap on Worcester Bosch Greenstar 8000 Life 30 when you get D5, F1 or E133 pressure-switch faults after a service.

The trap on Worcester Bosch Greenstar 8000 Life 30 snaps into the case bottom — flood with clean water before refitting to prime the U-bend.

Check the external condensate pipe fall (2.5° minimum) at the same time to avoid a repeat freeze-up.

Refill the Worcester Bosch Greenstar 8000 Life 30 to 1.2 bar cold. Bleed high-point radiators and the internal AAV.

Run a full flue-gas analysis after 15 minutes. Log the reading against the OEM commissioning envelope in the Benchmark book.

Can I clean the old one?: Rinse and refit if the trap body is undamaged, but always fit new seals.
22 mm external pipe rule?: Yes — post-2018 the run outside the wall must be 32 mm insulated per BS 6798.
Do I need to notify the manufacturer?: Only if the Worcester Bosch Greenstar 8000 Life 30 is in warranty — Worcester Bosch require log of any part swap for labour claims.

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