BoilerFaultCodesWorcester Bosch 55146 Fault Code
The Worcester Bosch 55146 fault code means: your boiler's built-in solar water heating software has been activated, but the solar system hasn't been set up or configured correctly for use.. It appears on 1 Worcester Bosch model in our database.
Technical description: Solar system is not yet in operation. Solar system not yet commissioned
What causes the Worcester Bosch 55146 fault?
This fault occurs because the boiler's internal computer has been told it is connected to a solar thermal system, but it cannot detect the signals it needs to operate it. The most common reason is that the solar function was accidentally switched on during a service or installation without the necessary solar sensors and controls actually being fitted.
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 55146 fault code
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Source
Worcester Bosch 55146 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