How to Replace a Worcester Bosch Cdi Classic Diverter (UK)
Fit a new diverter on the Worcester Bosch Cdi Classic. UK part number, isolation and torque steps.
Worcester Bosch
Part number
The Worcester Bosch Cdi Classic uses the diverter motor kit 87186643760. Check the GC serial number sticker inside the case — Worcester Bosch revised the diverter at least once during production.
Isolate
Turn off the gas at the isolation cock. Switch off 230 V at the fused spur. Drain to just below the diverter: on the Worcester Bosch Cdi Classic, the drain-off is on the return pipe.
Fit
Unclip the diverter. Transfer the O-rings if OEM includes new ones — always fit the new seals supplied. Torque any brass unions to 25 Nm. Refill to 1.2 bar, bleed and fire for a wet check.
Frequently asked questions
- OEM or compatible?
- For gas-carrying components on the Worcester Bosch Cdi Classic always fit OEM. Non-gas parts (fans, PCBs, pumps) — OEM keeps the warranty valid.
- Do I need to re-commission?
- Yes — record combustion CO/CO₂ ratio after any gas-side work per BS 6798.
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