Heat pumps · Error codes · Danfoss
low-pressure-transducerDanfoss · DHP-AQ
low-pressure-transducer on a Danfoss DHP-AQ: Fault in low pressure transmitter alternatively cable fault
Short answer
On a Danfoss heat pump, low-pressure-transducer means: Fault in low pressure transmitter alternatively cable fault. 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: Fault in low pressure transmitter alternatively cable fault.
Part involved: low pressure transmitter.
Likely causes:
- Transmitter or cable fault.
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 (inferred).
What you can check
- Note the exact alarm text. The manual allows acknowledging by setting operating mode OFF then back once; if the alarm returns, call an engineer.
What the engineer will check
- Check transmitter wiring and signal; replace transmitter.
Who to ask for: heat pump engineer.
Certification: F-Gas category I certificate (refrigerant circuit work).
What you might notice
Sources
- Service Instructions DHP-AQ (VMGFJ202) ↗ · VMGFJ202 · page p.10 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026