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FRIEDRICH AIR CONDITIONING CO. 5-5
Troubleshooting
5-2-4 When the compressor is not operated
1) Check points
(1) Is the voltage of the power source normal ? (the rating voltage ±10% range. )
(2) Is the desired temperature lower than the indoor temperature in the “COOL” mode?
(Compressor stopped)
(3) Is the starting condenser in good contact?
(4) Is the electric wire in good contact ? (CN71, RY71)
(5) Is the output voltage of the IC01(KA7812) and IC02(KA7805) normal ?
Turn off the power, and then turn it on again five
seconds later.
Replace the compressor.
Dose the Buzzer sound, when the power on?
Check whether the "COOLING ICON" LED lamp is on
and the operation starts when pressing the on/off
button of the remocon.
Is the IC03 output normal?
- When the compressor is on, IC03
No. 13 pin
→ Low.
Does the relay(RY71) operate normally?
- When the compressor is ON, the RY71 should operate.
Is the compressor normal?
Go to the clause "No power".
• Go to the clause "when he remocon
does not operate".
• Check the IC03 for short and cold
soldering.
• Replace the IC03.
• Check the relay coil resistance.
(resistance : About 150Ω±20Ω)
• Replace the relay.
• Check the operation of the O.L.P,
and replace it if necessary.
• Check the compressor
resistance.(0Ω : short, ∞Ω : open)
N
Y
Y
Y
Y
Y
N
Normal operation.
N
Y
N
N
N
Check whether the compressor is activated in three
minutes after turning on the power with the "CoolING
ICON" LED lamp being switched on when selecting the
cool mode of the remocon.
DB98_04511A(2)-2 2/18/03 4:12 PM Page 5-5