faulty-protective-anode-e41-f31 on an IVT Greenline HE: The alarm is activated when the anode in the hot water heater is broken or does not work. Presupposes that Yes is indicated in Protective anode installed
Short answer
On an IVT heat pump, faulty-protective-anode-e41-f31 means: The alarm is activated when the anode in the hot water heater is broken or does not work. Presupposes that Yes is indicated in Protective anode installed. 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 alarm is activated when the anode in the hot water heater is broken or does not work. Presupposes that Yes is indicated in Protective anode installed.
Part involved: E41.F31.
When it shows: The alarm is activated when the anode in the hot water heater is broken or does not work. Presupposes that Yes is indicated in Protective anode installed.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Manual reset: Acknowledge on control panel.
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. Contact the dealer. Acknowledge once on the control panel; if the alarm returns, contact the installer.
What the engineer will check
- Reset overheat protection / check electric heater and its supply.
Who to ask for: heat pump engineer.
What you might notice
Sources
- Installer Guide Greenline HE C6-C11 E6-E11 1x230V (6 720 802 419 (2012/06) en) ↗ · 6 720 802 419 (2012/06) · page 6 720 802 419 p.68; 6 720 643 409 p.84; 6 720 643 415 p.29 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026