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PROBLEM PROBABLE CAUSE CORRECTION
Product zone
temperature too high.
1.CONTROL SETTING TOO HIGH.
2.INADEQUATE AIR CIRCULATION.
3.DIRTY CONDENSER
1.ADJUST T-STAT
2.REARRANGE PRODUCT LOAD TO
IMPROVE AIR CIRCULATION.
3.CLEAN CONDENSER COIL
Suction line frosted or
sweating.
1.OVERCHARGE OF REFRIGERANT.
2.EVAPORATOR FAN NOT RUNNING.
3.EXPANSION VALVE STUCK OPEN.
4.EXPANSION VALVE SUPERHEAT TOO LOW.
1.EVACUATE AND RE-CHARGE.
2.DETERMINE REASON AND CORRECT.
3.CLEAN VALVE,EVACUATE AND RE-
CHARGE.
4.ADJUST SUPERHEAT TO REQUIRED
SETTING
Liquid line frosted,
cold, or sweating.
1.RESTRICTION IN DRIER STRAINER.
2.LIQUID LINE SERVICE VALVE PARTIALLY
CLOSED.
1.REPLACE DRIER,EVACUATE AND RE-
CHARGE
2.OPEN VALVE FULLY OR REPLACE IF
NECESSARY.
Noisy condensing unit.
1.LOOSE PARTS OR MOUNTINGS.
2.TUBING RATTLE OR VIBRATION.
3.BENT FAN BLADE CAUSING EXCESSIVE
VIBRATION.
4.FAN MOTOR BEARINGS WORN.
1.TIGHTEN ALL MOUNTING PARTS AND
SHROUD COVER.
2.REFORM TUBING TO BE FREE OF
CONTACT.
3.REPLACE FAN BLADE.
4.REPLACE FAN MOTOR.
THERMOMETER READS
DIFFERENT THAN ACTUAL
TEMPERATURE
1.CALIBRATION
2.DEFECTIVE
1.CONSULT OPERATIONS MANUAL AND
CALIBRATE
2.REPLACE
WATER LEAK INSIDE UNIT
1.CONDENSATE DRAIN PAN NOT INSTALLED
PROPERLY
2.UNIT NOT LEVEL
3.DRAIN PAN MISALIGNED
4.DFECTIVE DRAIN PAN
1.CONSULT OPERATION MANUAL FOR
INSTALL INSTRUCTION
2.MAKE SURE UNIT IS LEVEL OR PITCHED
BACK SLIGHTLY
3.MAKE SURE DRAIN PAN IS ALIGNED
PROPERLY
4.REPLACE
DOORS MISALIGNED
1.SHIFTED DURING SHIPPING 1.REFER TO OPERATION MANUAL FOR
HINGE ADJUSTMENT