S01 on a Kronoterm KSM system controller / KT-2A / Cloud.Kronoterm alarm list: Initialization error - incorrect initialization of indoor and outdoor unit, incorrect KT-2A operation mode setting or incorrectly connected communication cable
Short answer
On a Kronoterm heat pump, S01 means: Initialization error - incorrect initialization of indoor and outdoor unit, incorrect KT-2A operation mode setting or incorrectly connected communication cable. 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: Initialization error - incorrect initialization of indoor and outdoor unit, incorrect KT-2A operation mode setting or incorrectly connected communication cable.
Part involved: KSM / KT-2A communication.
When it shows: Associated 120 s timeout (per ManualsLib summary).
Likely causes:
- Incorrect initialization of indoor/outdoor unit.
- Incorrect KT-2A operation mode.
- Communication cable incorrectly connected.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Note the code and contact the installer (commissioning issue).
What the engineer will check
- Check KT-2A mode setting and communication cabling; re-run initialization.
Who to ask for: heat pump commissioning engineer.
What you might notice
Sources
- KRONOTERM KSM / KSM+ system regulator commissioning manual V3.14-1 (ManualsLib 4016095) ↗ · V3.14-1 · page 8 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026