EE on a Midea heat pump: Hydronic system EEPROM error
Short answer
On a Midea heat pump, EE means: Hydronic system EEPROM error. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 3 sources
What it means
On the M-Thermal Mono R32 (MHC ...W/D2N8-B / -B2 'Arctic')
The manual says: Hydronic system EEPROM error.
Likely causes:
- Hydronic system main PCB EEPROM is not connected properly.
- Hydronic system main PCB damaged.
On the M-Thermal Mono R32 compact (MHC ...WD2N8-C, 5/7/9/12/14/16 kW)
The manual says: The main control board of hydraulic module EEprom failure.
Likely causes:
- EEPROM parameter error.
- EEPROM chip broken.
- hydraulic module main PCB broken.
On the M-Thermal Split R32 (MHA outdoor + HB hydronic box)
The manual says: Hydronic box EEPROM error.
Likely causes:
- Hydronic box main PCB EEPROM is not connected properly.
- Hydronic box main PCB damaged.
Is it safe?
On the M-Thermal Mono R32 (MHC ...W/D2N8-B / -B2 'Arctic')
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
On the M-Thermal Mono R32 compact (MHC ...WD2N8-C, 5/7/9/12/14/16 kW)
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.
On the M-Thermal Split R32 (MHA outdoor + HB hydronic box)
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
On the M-Thermal Mono R32 (MHC ...W/D2N8-B / -B2 'Arctic')
- 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.
On the M-Thermal Mono R32 compact (MHC ...WD2N8-C, 5/7/9/12/14/16 kW)
- 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.
On the M-Thermal Split R32 (MHA outdoor + HB hydronic box)
- 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
On the M-Thermal Mono R32 (MHC ...W/D2N8-B / -B2 'Arctic')
- Hydronic system main PCB EEPROM is not connected properly.
- Hydronic system main PCB damaged.
On the M-Thermal Mono R32 compact (MHC ...WD2N8-C, 5/7/9/12/14/16 kW)
- EEPROM parameter error.
- EEPROM chip broken.
- hydraulic module main PCB broken.
On the M-Thermal Split R32 (MHA outdoor + HB hydronic box)
- Hydronic box main PCB EEPROM is not connected properly.
- Hydronic box main PCB damaged.
Sources
- Midea M thermal Arctic Mono (4~16kW) Service Manual ↗ · not stated (MBT Confidential) · page 64 (table); 77 (troubleshooting) · Reviewed 23 September 2026
- M-thermal Mono ATW Heat Pump Installation and Owner's Manual (5/7/9/12/14/16 kW) ↗ · 16125300001699 V4.0 · page PDF 75 (printed 72) · Reviewed 23 September 2026
- M-Thermal A Series Split R32 Service Manual (Midea CAC, 202004) ↗ · 202004 (file v31) · page 50 (table); 63 (troubleshooting) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026