Guides Search

Home › Worcester Bosch › Boilers › CC

Worcester Bosch Boiler CC Error Code

Outside weather sensor not reading on Worcester Bosch boilers.

Worcester BoschAll Worcester Bosch boiler codes

CC
May need a pro

An outside weather sensor is fitted but the boiler reads it as open or shorted. Worcester's booklet mentions sensors wired to the wrong terminals, a reading out of range, a broken cable or the PCB.

Compatible models

In the Worcester engineer's service booklet for Greenstar CDi Classic combi, system and regular boilers fitted with an outside sensor.

Also shown as

No other codes are listed for this fault.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Not sure you are reading the code right? See how to read Worcester Bosch boiler codes.

Safety first: never take the casing off a gas boiler. If you smell gas, open windows, don't use light switches, turn the gas off at the meter if you can and call your gas emergency number from outside. A carbon monoxide alarm going off means the same: switch the boiler off, get fresh air and call.

How to fix Worcester Bosch CC

  1. Look at the outdoor sensor

    From the ground, see whether the small sensor box on the outside wall has been knocked off, damaged or had its cable cut by building or garden work. Don't open it or the boiler.

  2. Restart the boiler

    Switch off at the spur, wait a minute and switch back on.

When to call a technician

Cable repairs and sensor replacement should be done by an engineer, ideally the installer who set up the weather compensation.

Parts linked to CC

These are the parts an engineer usually checks for this code. They sit inside the sealed casing, so leave them to a Gas Safe registered engineer.

Frequently asked questions

Which Worcester Bosch models show the CC code?

In the Worcester engineer's service booklet for Greenstar CDi Classic combi, system and regular boilers fitted with an outside sensor.

Can I fix Worcester Bosch CC myself?

Only the outside checks above. If they don't clear CC, the fix is inside the boiler and needs a Gas Safe registered engineer.

Other Worcester Bosch boiler codes

Last reviewed 2026-10-21. Codes and steps can vary by model; check your owner's manual.

Sources we checked