Heat pumps · Error codes · Kronoterm
OC2-communicationKronoterm · TERMOTRONIC-controlled heat pumps (legacy WP / WPL / WPLV water-water, brine-water, air-water)
OC2-communication on a Kronoterm TERMOTRONIC-controlled heat pumps: No communication with source circulation pump (CP)
Short answer
On a Kronoterm heat pump, OC2-communication means: No communication with source circulation pump (CP). The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: No communication with source circulation pump (CP).
Part involved: source circulation pump communication.
Likely causes:
- Communication fault.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
What you can check
- Note the exact message shown on the TERMOTRONIC display.
What the engineer will check
- Check pump communication/wiring.
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 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026