Troubleshooting; Display Board - Midea MSH-21HRN1-QB8 Service Manual

10.

Troubleshooting

10.1 Display board

Operation
The indicator flashes once every second after power is on and illuminates when the air conditioner is in
operation.
Timer indicator:
The indicator illuminates then TIMER is set ON.
PRE-DEF. indicator (For cooling & heating mode only)
The air conditioner starts defrosting automatically if outdoor unit frosts in heating operating.
At this time, PRE-DEF. indicator illuminates.
Auto indicator:
This indicator flashes when the air conditioner is in AUTO operation.
ECON indicator
This indicator illuminates while the air conditioner is in economic operation.
10.2 Troubleshooting
For models adopting electrical function:
Failure phenomenon
Over current protection of the compressor occurs 4
times
Indoor room temp. sensor is open circuit or short circuit
Temp. sensor on indoor evaporator is open circuit or
short circuit
Temp. sensor on outdoor condenser is open circuit or
short circuit (without cooling only models)
Outdoor unit protects(outdoor compressor current,
phase order etc)
EEROM error
Indoor unit communication error
r Extinguish
NOTE: For cool only model, the defrosting lamp is replaced with fan lamp, but malfunction display remains.
26
☆ Flash at 5Hz
Service manual
Operation
lamp
☆
X
☆
X
X
X
X
Timer Defrosting
lamp lamp
☆ ☆
☆
X
X X
☆
X
☆
X
☆
X
X X
Auto
lamp
☆
X
X
X
☆
☆
☆