too-high-boot-count-i-o-board-bas-x on an IVT Greenline HE: Compressor stops. Is activated if the controller has executed more than three new starts after the alarm Check CANbus cable connection, (Æ Chapter 17.9.40 )
Short answer
On an IVT heat pump, too-high-boot-count-i-o-board-bas-x means: Compressor stops. Is activated if the controller has executed more than three new starts after the alarm Check CANbus cable connection, (Æ Chapter 17.9.40 ). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Compressor stops. Is activated if the controller has executed more than three new starts after the alarm Check CANbus cable connection, (Æ Chapter 17.9.40 ).
Part involved: BAS x.
When it shows: Compressor stops. Is activated if the controller has executed more than three new starts after the alarm Check CANbus cable connection, (Æ Chapter 17.9.40 ).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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 if the alarm remains after acknowledgement. Acknowledge once on the control panel; if the alarm returns, contact the installer.
What the engineer will check
- Check CAN-bus cable and connections between boards/room sensor; check board power.
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.67 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026