Heat pumps · Error codes · York
PdYork · YKF Mono (CNC/CRC, 5-16 kW, R32)
Pd on a York YKF Mono: High temperature protection of air side heat exchanger temperature (T3)
Short answer
On a York heat pump, Pd means: High temperature protection of air side heat exchanger temperature (T3). 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: High temperature protection of air side heat exchanger temperature (T3).
Likely causes:
- Cause/corrective action column not provided in this YORK manual table; see Midea M-Thermal service documentation for the equivalent code (not copied here).
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
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.
- Check the outdoor unit is not blocked by leaves, debris or snow and has clear space around it.
- Restart once via the controller (OFF then ON) as the manual allows; if the code returns, call an engineer.
What the engineer will check
- Cause/corrective action column not provided in this YORK manual table; see Midea M-Thermal service documentation for the equivalent code (not copied here).
Sources
- YKF Air Source Heat Pump System - Monoblock Single and Triphase, 5 kW to 16 kW - Installation, Commissioning, Operation and Maintenance, Form 201.55-ICOM1.EN.CE (622) ↗ · 201.55-ICOM1.EN.CE (622) · page PDF 61 (printed 58) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026