Medium
8/2/1 on Worcester Bosch GB162

Your boiler is currently struggling to communicate with your wall-mounted heating controller, meaning it hasn't been set up correctly to read your home's temperature.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

RC35-HK1 remote control. No remote control assigned, although room temperature control has been set.

From this model's manual
Verified against the Worcester Bosch Gb162 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check that the thermostat or remote controller is powered on and has fresh batteries if applicable.Ensure the controller is securely clicked into its wall bracket to establish a solid connection.Navigate to the controller settings menu to re-pair or re-assign the unit to the boiler according to the installation manual.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 8/2/1: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

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

Related fault codes

8/2/2View →

Related guides you might find useful

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →