17
Trouble Shooting Guide Continued
Abnormal noise. 1 Loose compressor mounting nuts. 1 Tighten.
2 Defective, improper or worn rubber
grommets on the compressor mounting
bolts.
2 Replace grommets.
3 Copper tube vibrating. 3 Adjust by bending slightly to firm position. Separate tubes
touching cabinet or each other.
4 Loose cabinet or internal component. 4 Check and tighten loose screws.
5 Loose blower wheel. 5 Tighten screws on blower wheel to shaft.
6 Blower wheel hitting shroud. 6 Adjust wheel position on motor shaft.
7 Blower motor bearing defective. 7 Replace blower motor.
8 Unit overcharged 8 Recover entire refrigerant charge and weigh in proper charge.
9 Compressor motor defective. 9 Replace compressor.
Evaporator fan runs but
compressor doesn’t start
1 Low voltage to unit. 1
Check power supply for proper voltage at unit plus or minus 10%
of rated nameplate voltage.
2 Keypad control. 2 Check the temperature control for loose wires. Tighten any loose
connections. Replace if defective.
3 Loose or defective wires. 3 Tug on wires to see if they will separate from connections.
4 Compressor shorted, open or burned. 4 Check for shorts, opens and grounds. Remove and replace
compressor.
5 Shorted or open run capacitor. 5 Check capacitance and replace if necessary.
6 Unit in fan only mode. 6 Change mode.
7 Defective compressor relay. 7 Check and replace.
8 Freeze control open on heat pump model. 8 I
nlet water temperature cannot be less than 50°F. Replace control
if defective.
Evaporator blower motor not
running.
1 Defective fan motor. 1 Check and replace.
2 Defective fan capacitor. 2 Check capacitance and replace if necessary.
3 Defective wiring or connection. 3 Tug on wires to see if they will separate from connections.
4 Defective fan speed contactor. 4 Check and replace.
5 Keypad control. 5 Check the temperature control for loose wires. Tighten any loose
connections. Replace if defective.
Evaporator blower not running
up to full speed.
1 Low voltage to unit. 1
Check power supply for proper voltage at unit plus or minus 10%
of rated nameplate voltage.
2 Defective motor capacitor. 2 Check capacitance and replace if necessary.
3 Blower wheel rubbing against housing. 3 Inspect wheel alignment and correct.
Water leaking from unit. 1 Leaking evaporator condensate pan. 1 Locate leak and repair pan.
2 Condensate pump related. 2 Check to see if the elevation is over 11 ft. Pump will operate
properly against 11 ft. of water total head pressure on pump.
Otherwise, replace pump if defective. Make sure pump is sitting
level and is clean.
3 Defective drain hose (clogged or loose
connection).
3 Inspect hose for loose connections, clogs or kinks. Repair or
replace.
Unit tripping when plugged in
(cord connected units only)
1 Undesirable "Arc" from power receptacle. 1 Disconnect power completely from receptacle and reset the plug
by pressing the "reset" button. Reconnect the plug to the
receptacle. If tripping again, it means there is an "Arc" detected.
Check for shorts in unit wiring. Check for correct polarity at
receptacle. Replace the electrical receptacle outlet if defective.
2 Building does not have a dedicated
grounding system.
2 The units must be connected to a grounding system.
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