Troubleshooting - Sea Breeze PTAC49CH3ZX Service Manual

Unit cannot start up
A/C can run but it
cannot cooling (or
heating)

TROUBLESHOOTING

No power supply
Fuse is burned out
Supply voltage is too low
Switch is broken down
Failure of crystal oscillator or reset circuit
The wire is loosened
Transformer is broken
Controller is broken
Receiver head is loosened
Receiver head is broken or it isn't plugged well
Remote controller has malfunction
The thermostat hasn't been adjusted well
Too much dust accumulated on the filter
Heat exchanger is blocked
Fan speed is set too slow
The fan can't 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
First press the "AUTO" button of the manual
switch. If the button is normal, recheck if the
installation and connection of head and lines are
correct. If correct, replace receiving head or remote
controller.
Lower the temperature of the thermostat
(or increase the temperature when heating)
Clean the filter
Clean the dust accumulated on the surface of the heat
exchanger
Set the fan speed at high or medium 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.
~19~