#12.4 on an Ochsner OTS touch controller alarm platform: Dew point undershot, heating circuit 4 - troubleshooting: Customer settings (cooling curve), humidity sensor,
Short answer
On an Ochsner heat pump, #12.4 means: Dew point undershot, heating circuit 4 - troubleshooting: Customer settings (cooling curve), humidity sensor,. 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: Dew point undershot, heating circuit 4 - troubleshooting: Customer settings (cooling curve), humidity sensor,.
Part involved: Dew point undershot, heating circuit 4.
Likely causes:
- Customer settings (cooling curve).
- humidity sensor.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Manual reset: Faults are acknowledged via the controller Alarms menu (manual section 22.2).
What you can check
- Note the alarm number and text shown under Menu > Alarms and contact your system installer or OCHSNER customer service.
What the engineer will check
- Customer settings (cooling curve), humidity sensor,.
Who to ask for: heating installer (OCHSNER system partner).
What you might notice
Sources
- OCHSNER AIR HAWK 208 Operating manual (valid from app V03.03.xxx), incl. OTS fault messages ↗ · EN13 (BA_982010) · page 46 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026