How to Replace the Fan on a Ravenheat WH110 (UK)
Step-by-step UK guide to replacing the combustion fan on a Ravenheat WH110. Part numbers, torques, commissioning.
Ravenheat
The part
Swap the combustion fan on Ravenheat WH110 when you get low-speed lockouts (F28/F29 Vaillant, EA Worcester, F1 Ideal) or bearing whine.
Isolate safely
Remove the case, disconnect the fan plug and Venturi. Note the fan's part number stamped on the motor housing.
Fit and commission
On Ravenheat WH110 the fan is torqued to 8–10 Nm — over-tightening cracks the composite plenum.
Recommission checklist
Refill the Ravenheat WH110 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.
Frequently asked questions
- Which speed sensor connector?
- The Hall-effect sensor on Ravenheat WH110 uses a 4-pin JST plug. Do not swap L1/L2.
- Do I need a new gasket?
- Always fit the OEM Viton gasket — the old one hardens and leaks flue gases into the case.
- Do I need to notify the manufacturer?
- Only if the Ravenheat WH110 is in warranty — Ravenheat require log of any part swap for labour claims.
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