Heat pumps · Error codes · Kronoterm
HpHeatKronoterm · TERMOTRONIC-controlled heat pumps (legacy WP / WPL / WPLV water-water, brine-water, air-water)
HpHeat on a Kronoterm TERMOTRONIC-controlled heat pumps: Alarm: refrigerant pressure too high during heating
Short answer
On a Kronoterm heat pump, HpHeat means: Alarm: refrigerant pressure too high during heating. 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: Alarm: refrigerant pressure too high during heating.
Part involved: high pressure switch.
Likely causes:
- Insufficient water flow through the condenser.
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/valves, clean strainer, refill/vent.
Who to ask for: heat pump engineer / F-gas.
Certification: F-gas certification for refrigerant work.
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, 57 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026