714 on an alpha innotec heat pump: Hot gas SW. Reset in hh:mm: Thermal application limit of the heat pump reached during DHW; domestic hot water off for hh:mm. Only triggers while compressor running
Short answer
On an alpha innotec heat pump, 714 means: Hot gas SW. Reset in hh:mm: Thermal application limit of the heat pump reached during DHW; domestic hot water off for hh:mm. Only triggers while compressor running. 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: Hot gas SW. Reset in hh:mm: Thermal application limit of the heat pump reached during DHW; domestic hot water off for hh:mm. Only triggers while compressor running.
When it shows: Thermal application limit of the heat pump reached during DHW; domestic hot water off for hh:mm. Only triggers while compressor running.
Likely causes:
- DHW flow problem.
- DHW heat exchanger.
- DHW temperature too high for application limit.
- Circulation pump.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: automatic.
What you can check
- Note the error number and text shown on the Luxtronik display.
- The controller resets this automatically after the stated time - wait for the automatic restart before calling.
- 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 flow of domestic hot water.
- Check heat exchanger.
- Check DHW temperature and circulation pump.
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 52 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026