SYMPTON PROBABLE CAUSE (S) POSSIBLE SOLUTION
Icing condition in drain
pan under evaporator
1. Low voltage 1. Check voltage at
compressor
2. Cabinet not level 2. Check front to rear
leveling
3. Defective defrost
heater
3. Replace
4. Drain trap does not
have water in it
4. Pour water down
drain
Low suction pressure
Low head pressure
1. CPR not set properly 1. Reset to 10 psi
2. Defective CPR 2. Replace
3. Cap tube blocked due
to moisture or dirt
3. Change drier,
evacuate, and recharge
4. Short of refrigerant 4. Leak check, change
drier, evacuate, and
recharge
Pressures normal -
cabinet warm
1. Top coil blocked with
frost
1. Check defrost system
2. Evaporator oil logged 2. Blow oil out of
evaporator
LIGHT PROBLEMS / SOLUTIONS
Lights won’t work 1. Check light switch
2. Check continuity to ballast
3. Check to see if bulbs inserted
properly in sockets
4. Check voltage
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