Heat pumps · Error codes · Kronoterm
ERROR-ThermostatKronoterm · TERMOTRONIC-controlled heat pumps (legacy WP / WPL / WPLV water-water, brine-water, air-water)
ERROR-Thermostat on a Kronoterm TERMOTRONIC-controlled heat pumps: Room corrector (KT-1/KT-2) 1-4 not connected properly or malfunctioning
Short answer
On a Kronoterm heat pump, ERROR-Thermostat means: Room corrector (KT-1/KT-2) 1-4 not connected properly or malfunctioning. 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: Room corrector (KT-1/KT-2) 1-4 not connected properly or malfunctioning.
Part involved: room corrector / thermostat.
Likely causes:
- Error in data acquisition.
- Thermostat malfunction.
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 exact message shown on the TERMOTRONIC display.
- Check the room thermostat/corrector is working and its settings.
What the engineer will check
- Check corrector wiring/regulator settings.
Who to ask for: heat pump engineer.
What you might notice
Sources
- KRONOTERM Owner's manual for heat pumps water-water, brine-water and air-water (TERMOTRONIC controller), Id 17-16-19-2972-05 ↗ · 17-16-19-2972-05 · page 53, 60 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026