Heat pumps · Error codes · Danfoss
13Danfoss · DHP-AT
13 on a Danfoss DHP-AT: Supply water temperature too low (cooling mode only)
Short answer
On a Danfoss heat pump, 13 means: Supply water temperature too low (cooling mode only). 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: Supply water temperature too low (cooling mode only).
Part involved: Supply water temperature too low (cooling mode only).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Note the 2-digit code. If the code persists, call an engineer.
What the engineer will check
- Measure sensor/cable resistance or check the indicated circuit; consult VMGFI302 section 4.4 check and safety functions.
Who to ask for: heat pump engineer.
What you might notice
Sources
- Installation Guide DHP-AT - Installation and service manual (VMGFI302 / AN089486453198) ↗ · VMGFI302 · page p.32 (section 10.1.1); safety functions pp.16-17 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026