Table of Contents
Advertisement
Unit cannot start up
A/C can run but it
cannot cooling (or
heating)
TROUBLESHOOTING
No power supply
Fuse burn-out
Power voltage is too low
Switch failure
Failure of crystal oscillator or reset circuit
Wiring is loose or incorrect
Transformer is broken
Controller is broken
The thermostat is adjusted improperly.
Too much dust on the filter
Heat exchanger is blocked
Fan speed is set too slow
Fan does not run or the fan speed is too slow
Switch is at the OFF position; or socket and plug is
loosened; or the power cord has malfunction; or power
failed.
Replace the fuse
Inspect the power voltage. If it is lower 10% of the rated
voltage, please look for the reason, improve the power
supply condition and add the regulated power supply.
Check if optional switch (ON,OFF) is disconnected with the
wire or it's with mechanical failure; use the universal meter
to check if contacts of the switch are conducting; if not,
replace it with a new one with the same model and
specification
Replace those parts which has malfunction
Check the circuit and connect the wire according to the
wiring diagram attached on the unit
Replace the transformer
Replace the controller
Lower the temperature of the thermostat
(or increase the temperature when heating)
Clean the filter
Clean the dust on the surface of the heat exchanger
Set the fan speed at High or Auto fan speed
1. Wrong wire connection. 2. Check the capacitor
damaged or not; 3. The motor failed;
Connect the wire correctly or replace those parts which
has malfunction.
~23~
Hide quick links:
Advertisement
Table of Contents
