high-flow-temperature-e2x-t8 on an IVT Greenline HE: The information is given if the temperature of the heating medium is too high. The information can appear temporarily when high room and hot water temperatures are set
Short answer
On an IVT heat pump, high-flow-temperature-e2x-t8 means: The information is given if the temperature of the heating medium is too high. The information can appear temporarily when high room and hot water temperatures are set. 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: The information is given if the temperature of the heating medium is too high. The information can appear temporarily when high room and hot water temperatures are set.
Part involved: E2x.T8.
When it shows: The information is given if the temperature of the heating medium is too high. The information can appear temporarily when high room and hot water temperatures are set.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
What you can check
- Note the full alarm text including the component designation (e.g. E21.T6) - IVT asks for it when you contact the dealer. Check the heating-system pressure gauge is in the range given in the user guide - do not top up yourself unless you have been shown how; check radiator/underfloor valves and room thermostats are open.
What the engineer will check
- Investigate per the installer guide alarm description and operating data.
Who to ask for: heat pump engineer.
What you might notice
Sources
- User Guide Greenline HE C6-C11 E6-E17 (6 720 643 415 (2010/03)) ↗ · 6 720 643 415 (2010/03) · page 6 720 643 415 p.34 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026