CHUNLAN FRD50-B - (II) Electrics and control troubleshooting

Troubleshooting
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Phenomena Possible causes Correction method
Compressor failure Replace compressor
Reversing valve failure Replace reversing valve
Leaking refrigerant or shutoff valve not
open, clogging system
Detect and repair leakage or open
shutoff valve
Insufficient or excessive refrigerant Add (discharge) refrigerant
Poor thermal insulation of indoor unit
connecting pipe
Separate thermal insulation for big
and small pipes
Defrosting controller failed Replace defrosting controller
Poor air delivery duct design, installation
or user operation causing reduced indoor
air delivery
Re-design or re-install air delivery
duct, proper use of unit by user
(7) Water leakage on indoor unit
Phenomena Possible causes Correction method
Dewing of drain pipe Replace with insulated pipe or
wrap drain pipe with insulation
Clogged or broken drain pipe Clean or replace drain pipe
Wrapping of pipe connector not tight,
dewing
Wrap tight
Water leakage in indoor condensate tray Replace condensate tray
Indoor unit
water
leakage
Serious inclination of indoor unit Re-install indoor unit
(II) Electrics and control troubleshooting
1. Maintenance prompts
In case of abnormity of air conditioner, do not remove circuit board; check the following:
a. Failure in power supply line: power input must be safe and reliable;
b. Correct operation of air conditioner and operating conditions of each operating mode (refer
to operation manual for method of operation);
c. Good contact of cards and reliable installation of indoor/outdoor connecting cable;
d. Normal status of compressor, fans and sensors (refer to instruction manual for electric
wiring);
e. Functional protection caused by external environment is normal protection and no servicing