What does the Worcester Bosch 1021 B fault code mean?

Your boiler's hot water sensor isn't communicating with the system, which means it cannot safely or accurately heat your water.

How much does it cost to fix Worcester Bosch error code 1021 B?

Typical repair cost for the Worcester Bosch 1021 B fault is £90-160 including labour.

Manufacturer manual

Hot water temperature sensor is defective – the plug to the hot water temperature sensor may not be connected

Shared across the range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like 1021 B: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Affiliate links. We may earn a commission at no extra cost to you.