Heat pumps · Error codes · Danfoss
brine-outDanfoss · DHP-H
brine-out on a Danfoss DHP-H: Brine out is less than the set minimum temperature. Compressor stopped. No hot water production
Short answer
On a Danfoss heat pump, brine-out means: Brine out is less than the set minimum temperature. Compressor stopped. No hot water production. 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: Brine out is less than the set minimum temperature. Compressor stopped. No hot water production.
Part involved: brine out sensor / ALARM BRINE setting.
Likely causes:
- Defective brine-out sensor; brine temperature at or below the ALARM BRINE set value (function inactive from factory).
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: Yes, when the condition clears.
What you can check
- Note the exact alarm text. The manual allows acknowledging by setting the operating mode to OFF and then back to the previous mode - do this once; if the alarm returns, leave it and call an engineer. Look at the brine expansion tank: the fluid level should be visible (user guide check). Do not refill or open the ground-loop circuit yourself - call the installer.
What the engineer will check
- Check sensor reading/resistance against 22 kOhm NTC table; check ALARM BRINE setting in service menu vs antifreeze protection; assess collector sizing.
Who to ask for: heat pump engineer.
What you might notice
Sources
- Service instructions DHP-A, DHP-A Opti, DHP-AL, DHP-AL Opti, DHP-C, DHP-H, DHP-H Opti, DHP-H Opti Pro, DHP-L, DHP-L Opti, DHP-L Opti Pro (VMGFC302) ↗ · VMGFC302 (© 2010; PDF regenerated 2024-07-10 on assets.danfoss.com) · page printed p.35, p.43 (Table 19); PDF pp.37, 45 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026