Heat pumps · Error codes · Kronoterm
ERROR-HeatSourceTempKronoterm · TERMOTRONIC-controlled heat pumps (legacy WP / WPL / WPLV water-water, brine-water, air-water)
ERROR-HeatSourceTemp on a Kronoterm TERMOTRONIC-controlled heat pumps: Source temperature outside operating range
Short answer
On a Kronoterm heat pump, ERROR-HeatSourceTemp means: Source temperature outside operating range. 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: Source temperature outside operating range.
Part involved: heat source.
Likely causes:
- Source temperature outside operating range.
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.
What the engineer will check
- Check source circulation pump/valves/strainer; authorised service.
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 52, 60 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026