MCAC-VTSM-2016-04 R410A DC Inverter VRF V4 Plus W Series 50Hz
Troubleshooting 199
1. Normal air conditioner phenomenon
1.1 When main unit appears white vapor or water, the reasons is as follows:
1) The fan of main unit stops to begin defrosting.
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 Main 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, main 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 main unit are blocked, outside strong air blows into main unit’
s outlet.
③ When heating running, dust adheres to air filter to block inlet or outlet of main 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.
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