Emergency
A08 on Ferroli HiTech RRT 34C

Your boiler has temporarily shut down because it has detected that it is getting too hot inside.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

Overtemperature protection intervention

From this model's manual
Verified against the Ferroli/Ferroli Bluehelix Hitech Rrt 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 emergency 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 A08: 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

A01View →A02View →F37View →

All 36 fault codes on the HiTech RRT 34C

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

A06A09A11A14A23-A24-F51A26A44A80A88A98A99F05F09F10F11F12F13F15 - A07F19F21F34F35F37F39F40F47F50F50 - F53F51F53F62F64F96F99Fh

Related guides you might find useful

Banging, kettling or whistling noise

Each noise points to a different fault.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →