Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

67 PB
TROUBLESHOOTING
Malfunction Analysis
Malfunction Possible Reasons How to solve
Start Failure
power line broken, units without power
supply
"Check the indicator LED on the LCID
power head, and it should be lit up ;If
not, push the RESET button, if no volt-
age stll, but power grid has
output, you need to change the power
cord." See gure 701
Power cord protection trip "Check the power cord .If damaged,
replaced. If no damage noted, push
the RESET button. If still not solved,
replace the power cord."
Power cord not plugged in correctly Seat plug correcly..
PCB fuse broken "Check if any load (in fan, out fan, re-
versing valve, power transformer) has a
short circuit. Eliminate the
error and replace the fuse with the
same type."
Bad connection between main board
and control panel
Check connecting wires, making sure
all areconnected well.
Compressor delay start If it's normal, compressor will start
after 3 minutes.
Power fail protection "When power on, because of auto-
restart, unit will delay starting in
120~240s"
Unit in protection mode Please check the ERROR CODE.
Main board or Control panel broken Replace main board or control panel.
Control panel do not work When switching to 24V remote thermo-
stat, the control panel will not function.
"If you need to use control panel to take
control, you need to switch the control
mode. See Switch Over Between 24V
Remote Thermostat and Control Panel
in the advanced settings section."See
Figure 702
Indoor fan/outdoor fan does not func-
tion or run slowly
Fan is locked by something or the
power wires are not correctly connect-
ed; fan capacitor terminals loose; fan
capacitor is out of service life
Disconnect the power cord, check
whether the fan can run smoothly by
hand or other tools or whether motor
wire is xed well. If fan runs slow,
replace capacitor..