Fault 59 201 Low

Worcester Bosch Fault 59 201 Fault Code

Also written as FAULT59201 — same fault.

The Worcester Bosch Fault 59 201 fault code means: your solar heating system is moving fluid too quickly through the roof collectors, which may indicate a settings error or a faulty sensor.. It appears on 2 Worcester Bosch models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Mass flow rate in solar system for collector group 1 is too high.

What causes the Worcester Bosch Fault 59 201 fault?

This fault occurs when the fluid in your solar heating system is circulating at a rate higher than the system's design limits. The most common reasons are incorrect settings on the solar control pump or a malfunctioning sensor that is misreporting the speed of the liquid moving through the roof panels.

This fault is more common during the summer months when high levels of solar radiation cause the system to operate more frequently and at higher intensities.

Typical repair cost £90-210 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the Fault 59 201 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch Fault 59 201 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