Heat pumps · Error codes · Kronoterm
MODULE-5-6-ALARMKronoterm · TERMOTRONIC-controlled heat pumps (legacy WP / WPL / WPLV water-water, brine-water, air-water)
MODULE-5-6-ALARM on a Kronoterm TERMOTRONIC-controlled heat pumps: No communication with Carel EEV 1 (module 5) / EEV 2 (module 6)
Short answer
On a Kronoterm heat pump, MODULE-5-6-ALARM means: No communication with Carel EEV 1 (module 5) / EEV 2 (module 6). 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: No communication with Carel EEV 1 (module 5) / EEV 2 (module 6).
Part involved: Carel EEV driver communication.
Likely causes:
- Communication error with EEV driver.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Device restarts automatically after error resolved.
What you can check
- Note the exact message shown on the TERMOTRONIC display.
What the engineer will check
- Authorised service: EEV driver 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 52-53 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026