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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
These must be swapped into the regulator housing according to the manufacturer’s specifications to ensure correct LP gas valve operation
The McDonnell & Miller 64-B Low Water Cut Off (Part Number 143800) is a heavy-duty mechanical safety control engineered for both hot water and steam boilers
Optimized Compatibility: Engineered for Vitodens WB2-HA/HB models (45/60/80/100 and 160–352 range)
and small commercial additions
Designed mainly for liquid receiver applications above the liquid refrigerant level
Viessmann 7834235 Ionisation Electrode 328140-751 These must be swapped intoMaintaining precise flame rectification is critical for the operational safety of high efficiency condensing boilers. This genuine Viessmann 7834235 Ionisation Electrode is engineered specifically for the Vitodens 200 W WB2B series, ensuring the control board receives a stable microamp signal to confirm combustion. A faulty or oxidized electrode can lead to intermittent "F4" fault codes or hard lockouts, necessitating an immediate swap to restore