Heat pumps · Error codes · Riello
16Riello · NXHP (R290 monobloc)
16 on a Riello NXHP: TE and TS sensors wrongly connected or PMV failure
Short answer
On a Riello heat pump, 16 means: TE and TS sensors wrongly connected or PMV failure. 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: TE and TS sensors wrongly connected or PMV failure.
Likely causes:
- Manual: investigations and corrective actions to be performed by a fully qualified technician (see Table 6 probable causes).
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
- Read and note the exact code shown on the controller display.
- Check the heat pump's breaker/isolator at the consumer unit is on.
- Restart once via the controller (OFF then ON) as the manual allows; if the code returns, call an engineer.
What the engineer will check
- Manual: investigations and corrective actions to be performed by a fully qualified technician (see Table 6 probable causes).
Sources
- Riello NXHP Series Installation, Operation and Maintenance Instructions (ManualsLib copy) ↗ · not stated · page 66 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026