If there are minor malfunctions in the operation of this unit, you may not rush to contact the service center and try to solve the problem yourself. Let’s take a look at the most common failures, which can be repaired at home, and consider ways how to eliminate them.
1. Normal Air Conditioner Phenomenon
1.1 When outdoor unit appears white vapor or water, the reasons is as follows:
1) The fan of outdoor unit stops to begin defrosting0.
2) The electromagnet valve sends out the noise when the defrosting begins and ends.
3) There is sound like water flowing when running or off; and the noise enlarges after running for 3 minutes. This is the sound of refrigerant flowing or discharging water gathered by dehumidifying.
1.2 Outdoor units send out the noise of “pupu”, for temperature changes to heat exchanger heat expanded or cool compact.
1.3 Indoor units send out odor smell, because it absorbs the smell of house, furniture or smoking.
1.4 The running light of indoor unit flickers, the reasons are generally as follows:
1) Power supply ever failed during running period.
2) For 1-to-several, the following induces the director lighting and the operation stopping
① Other indoor units running at heating mode induce to this indoor unit cannot run at cooling mode
② Setting mode conflicts with the fixed mode.
③ Stop fan to prevent discharging cool air.
1.5 The “no priority” or “waiting” director light of operation board lights.
1.6 Auto running or stopping for the timer wrong operation.
1.7 Cannot run, the reasons are as follows:
① Power is off.
② Manual switch is pulled to off side.
③ Fuse is cut.
④ Protect device starts, at the same time running director lights.
⑤ Timer’s setting time is over, at the time running director lights.
1.8 Heating or cooling is inefficient.
① Filter is block by duct or rubbish.
② The place of air deflector is unfit.
③ Fan mode is “slight” or running mode is “fan”.
④ Setting temperature is unfit.
⑤ Simultaneously choose the heating and cooling mode, at the time the “no priority” or “waiting” director light of panel lights.
2. Air Conditioner Protection in Common
2.1 Compressor protection.
When power is on, or machine stops then restarts right away, outdoor unit will run in 3 minutes to protect
the compressor from too frequent starts and stops.
2.2 When the protection device functions, running stops. Refer to the following:
① forced to start but not possess the start article, and display light lights.
② When cooling running, inlet and outlet of outdoor unit are blocked, outside strong air blows into outdoor unit’s outlet.
③ When heating running, dust adheres to air filter to block inlet or outlet of outdoor unit.
Note: when protecting, please cut manual power switch. After checking the reason and solving it, restart.
2.3 Power fails.
① If power supply fails while machine is running normally, system will record this.
② When the machine is powered on again, the running light of wire controller would flash to inform user about this.
③ Press the on/off key of wire controller to confirm this before restart the system.
Note: When running, if system takes place mistaken operation or lighter, please pull down the power Troubleshooting MCAC-VTSM-2011-09
162 Troubleshooting supply switch to cut it off. Before restarting machines, please press the on/off key again as above.
3. Malfunction Code and Troubleshooting Midea air conditioner V4+i
If there is phenomenon as follows, please stop air conditioner running and cut power supply and refer to the following. However, if the problem insists, please contact the customer service center of Midea commercial air conditioner company, and offer machine’s model and detailed malfunction.
Midea 8-16HP air conditioner troubleshooting
|Code||Malfunction or protection|
|E1||Phase sequence malfunction|
|E2||Communication between prime outdoor unit and indoor units|
|E4||Ambient temp. sensor malfunction|
|H0||Communication malfunction between IR341 and 780034|
|H1||Communication malfunction between 0537 and 780034|
|H4||There are 3 times P6 protection In 30 minutes.|
|H5||There are 3 times P2 protection In 30 minutes.|
|H6||There are 3 times P4 protection In 100 minutes.|
|H9||There are 3 times P9 protection In 30 minutes|
|H7||Indoor unit quantities decreasing malfunction over 3 minutes|
|P0||The sensor protection on the top of inv. compressor.|
|P1||High pressure protection|
|P2||Low pressure protection|
|P3||Inv. compressor over current protection|
|P4||Discharge temp. sensor protection|
|P5||Pipe temp. sensor protection|
|P7||Fixed 1 current protection|
|P8||Fixed 2 current protection|
|P9||Fan module protection|
|L1||DC generatrix low voltage protection|
|L2||DC generatrix high voltage protection|
|L4||MCE malfunction/simultaneously/cycle loop|
|L5||Zero speed protection|
|L7||Wrong phase protection|
|L8||Speed difference >15Hz protection between the front and the back clock|
|L9||Speed difference >15Hz protection between the real and the setting speed|
Midea 30HP, 18-20HP air conditioner V4+i troubleshooting
|Code||Malfunction or protection||remark|
|E0||Outdoor unit communication error||Display in |
auxiliary unit only
|E1||Phase squence error|
|E2||Communication error between indoor unit and main unit|
|E4||Outdoor temp sensor error|
|E8||Outdoor unit address error|
|H0||Communication error between DSP and 780034|
|H1||Communication error between 0537 and 780034|
|H2||Outdoor unit qty. decrease error||Display in main |
|H3||Outdoor unit qty. increase error||Display in main |
|H4||Three times of P6 protect in 30 minutes|
|H5||Three times of P2 protect in 30 minutes||Must be re-powered |
on for the recovery
|H6||Three times of P4 protect in 100 minutes||Must be re-powered |
on for the recovery
|H7||Qty of indoor unit decreases|
|P0||Inverter top temp. protection|
|P3||Compressor overcurrent protection|
|P4||Compressor discharge temp. protection|
|P5||Outdoor condenser high temp. protection|
|P6||Inverter module protection|
|P7||Current protection, No.1 fixed compressor|
|P8||Current protection, No.2 fixed compressor|
|P9||Current protection, No.3 fixed compressor|
|L0||Module error||Display during |
|L1||DC busbar low voltage protection|
|L2||DC busbar high voltage protection|
|L4||MCE error/ synchronize/ closed loop|
|L5||Zero velocity protection|
|L6||Reserve||Display during |
|L7||Phase squence error protection|
|L8||The speed difference between the previous time and the |
following time > 15Hz protection
|L9||The speed difference between the setting speed |
and actual speed>15Hz protection
|F1||Current protection, No.1 fixed compressor|
|F2||Current protection, No.2 fixed compressor|
|F3||Current protection, No.3 fixed compressor|
|F4||Current protection, No.4 fixed compressor|
|F5||Current protection, No.5 fixed compressor|