BoilerFaultCodesWorcester Bosch Fault 50 140 Fault Code
Also written as FAULT50140 — same fault.
The Worcester Bosch Fault 50 140 fault code means: your solar heating system is unable to move water because the pump is stuck or there is an air pocket trapped in the pipes.. It appears on 1 Worcester Bosch model in our database.
Technical description: Solar pump jammed or air in system / Air in solar thermal system.
What causes the Worcester Bosch Fault 50 140 fault?
This fault occurs when the solar thermal system is unable to circulate its heating fluid effectively. The most common reasons are a buildup of air pockets within the pipework that block flow, or the pump itself becoming physically jammed after periods of inactivity. This prevents the heat collected from your solar panels from reaching your hot water cylinder.
This fault is frequently encountered during the first sunny days of spring or summer when the solar system is called upon to work at full capacity after being less active during the winter.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the Fault 50 140 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Fault 50 140 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026