ERROR-NO-WATER on a Kronoterm TERMOTRONIC-controlled heat pumps: Heat source pump switched off or shortage of water for the heat source / insufficient flow of medium between HP and heating system
Short answer
On a Kronoterm heat pump, ERROR-NO-WATER means: Heat source pump switched off or shortage of water for the heat source / insufficient flow of medium between HP and heating system. 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: Heat source pump switched off or shortage of water for the heat source / insufficient flow of medium between HP and heating system.
Part involved: flow / heat-source pump.
Likely causes:
- Insufficient water flow through condenser/evaporator.
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: After fixing the cause restart by holding ENTER for 3 s.
What you can check
- Note the exact message shown on the TERMOTRONIC display.
- Check the heating system pressure gauge reading.
What the engineer will check
- Check circulation pump and valves, clean strainer, refill to 1.5-2 bar and vent (manual lists these as user steps; treated as engineer-only).
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 51, 59 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026