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PROBLEM: COMPRESSOR STARTS & RUNS, BUT EVAPORATOR FAN DOES NOT RUN.
1. CAUSE: Loose wires on fan speed switch or fan cycle switch. REMEDY: Check for loose wires,
repair/replace as required.
2. CAUSE: Defective fan speed switch. REMEDY: Remove/replace fan switch.
3. CAUSE: Defective fan cycle/constant switch in cord storage compartment. REMEDY: Remove & repair
switch.
4. CAUSE: Shorted or open fan motor capacitor. REMEDY: Remove/replace capacitor.
5. CAUSE: Open fan motor coil (winding). REMEDY: Remove/replace evaporator blower.
6. CAUSE: Defective fan relay, burned contact or defective pull-in coil. REMEDY: Remove/replace relay.
PROBLEM: INSUFFICIENT COOLING
1. CAUSE: Insufficient air flow through evaporator coil due to:
A. Dirty air filter B. Dirty evaporator coil
C. Obstructed evaporator inlet air
REMEDY: A. Remove filter grille assembly, wash filter or clean with vacuum.
B. Remove obstruction.
2. CAUSE: IMPROPER SIZING OF UNIT. REMEDY: Make sure unit is properly sized for load (application).
Add supplemental unit(s) as required.
PROBLEM: NOISY OPERATION
1.CAUSE: Copper tubing vibrating. REMEDY: Adjust by bending copper tubing slightly to a new, firm
position. Segregate tubes touching cabinet or each other.
2. CAUSE: Loose cabinet or internal component. REMEDY: Check, tighten loose screws.
3. CAUSE: Unit vibrating out of level. REMEDY: Re-position so it is level with the floor.
4. CAUSE: Object dropped into evaporator or condenser blower. REMEDY: Turn unit off, inspect blower
housings for foreign objects; remove and restart unit.
5. CAUSE: Loose blower mounting bolts. REMEDY: Tighten bolts, restart blower.
6. CAUSE: Defective external rotor motor. REMEDY: Remove/replace blower assembly.
7. CAUSE: Loose or misaligned blower/motor pulley/belts on belt drive units.
8. CAUSE: Loose set screws on blower pulley or blower motor pulley. REMEDY: Inspect,
repair/tighten/replace set screws to eliminate noise.
9. CAUSE: Defective/worn motor mount rings. REMEDY: Repair/replace motor mount rings.
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