Heat pumps · Error codes · Midea
C2Midea · M-Thermal Arctic HT R290 monobloc (MHC ...WD2N7)
C2 on a Midea M-Thermal Arctic HT R290 monobloc: Relay adhesion on IBH PCB (units with internal backup heater)
Short answer
On a Midea heat pump, C2 means: Relay adhesion on IBH PCB (units with internal backup heater). 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: Relay adhesion on IBH PCB (units with internal backup heater).
Likely causes:
- See R290 service manual troubleshooting (section 6) for this code.
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
- See R290 service manual troubleshooting (section 6) for this code.
Sources
- R290 M thermal Arctic HT Series Service Manual ↗ · 2025-10-15 v5 (from file name) · page 93 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026