High
24. on Remeha Quinta 30

Your boiler is confused because it detects that the water flowing out is cooler than the water flowing in, which is the opposite of how it should be working.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Temperature sensor fault. a. Flow and return temperature sensors mixed up. b. Flow and return connections mixed up. c. Water flow in D.H.W. mode not correct.

From this model's manual
Verified against the Remeha/Remeha Quinta 30 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 is a high severity fault. Stop using the boiler and call 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 24.: 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

E02View →E03View →

All 70 fault codes on the Quinta 30

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

<000!00.0)0@0*0%0$1 to 91-21!01.1(1*02.2(2*2$033!3@3&3^3$044-54)6-77&8-908.1010-1112.131415161718.19.20-2125.28.29.30.31.32.36.3737.414243.6061.975980A.B@(B@*B@%b@^b#B$#E1E3x[[X00

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →