767 on an alpha innotec heat pump: STB E-Rod: Safety temperature limiter (STB) of the electric heating element has been activated
Short answer
On an alpha innotec heat pump, 767 means: STB E-Rod: Safety temperature limiter (STB) of the electric heating element has been activated. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: STB E-Rod: Safety temperature limiter (STB) of the electric heating element has been activated.
When it shows: Safety temperature limiter (STB) of the electric heating element has been activated.
Likely causes:
- Heating element overheated.
Is it safe?
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Safety lockout |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: no.
Manual reset: manual reset by installer/authorised service required.
What you can check
- Note the error number and text shown on the Luxtronik display.
- Acknowledge the message by pressing the rotary pushbutton for about 7 seconds (as the Luxtronik manual permits); if the same error reappears, contact your installer or ait customer service with the error number.
- Check the heat pump breakers/isolator at the consumer unit are on (do not open any casing).
What the engineer will check
- Check the heating element and press the STB fuse back in.
Who to ask for: heat pump / heating engineer.
What you might notice
Sources
- Operating manual Luxtronik heating and heat pump control Part 2 (UK) 83055400lUK - 2.1 ↗ · 83055400lUK 2.1 · page 54 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026