Medium
380 on Worcester Bosch Greenstar 27i System Compact ErP

Your boiler has detected that the incoming cold water is warmer than the hot water it is producing, which usually points to a sensor or valve issue.

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

Inlet DHW temperature higher than the DHW outlet temperature.

From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Greenstar 12i System 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.

Engineer required

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

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 380: 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

EAView →D1View →

All 65 fault codes on the Greenstar 27i System Compact ErP

Seeing a different code? Every code this model can display, in one place.

& F08C9U200201202203204205207208210211212213217260261262263264265266267268269270271272273274276277278280338A3A7A8b7C4C6C7CCCECFD1D3D4E2E3E4E5E9EAECEDEEEFF0F7FAFbFD

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on a combi.

Read →

Hot water works but heating does not

On a combi it is usually the diverter valve. On a system boiler, the motorised valve.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →