How to Replace a Vaillant ecoTEC Diverter Valve (UK)
Full diverter assembly swap on Vaillant ecoTEC plus/pro. OEM 0020132682, motor head 178984.
Vaillant
Two parts to fail
Vaillant diverters have two failure modes: the cartridge (mechanical, 0020132682) or the motor head (electrical, 178984). Swap the motor first — often solves stuck DHW.
OEM parts
- Full assembly — 0020132682.
- Motor head only — 178984.
- Cartridge only — 178985.
- O-ring kit — 0020017181.
Fit
Isolate at service valves. 15 mm socket for motor head, T25 Torx for cartridge clip. Refit with grease on all EPDM O-rings.
Frequently asked questions
- Does the diverter code need clearing?
- No — Vaillant ecoTEC auto-clears on 3 successful cycles.
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