Heat pumps · Error codes · York
H1York · YKF Mono (CNC/CRC, 5-16 kW, R32)
H1 on a York YKF Mono: Communication malfunction between main control board and inverter board
Short answer
On a York heat pump, H1 means: Communication malfunction between main control board and inverter board. 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: Communication malfunction between main control board and inverter board.
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?
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Not stated |
|---|---|
| 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.
- If the breaker has tripped or trips again, leave the unit off and call an engineer; do not keep resetting it.
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 60 (printed 57) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026