Compressor attempts to start but doesn’t:
1. Check capacitor.
2. Check for defective compressor by making
resistance check on winding.
3. Check run capacitor.
Compressor runs in short cycle:
1. Check thermostat mounting and location.
2. Check all relays, relaying and contacts.
3. Check run capacitor.
4. Check high pressure switch.
5. Check low temperature switch.
6. See if reversing valve has not fully shifted to either side.
Insufcient cooling or heating:
1. Check thermostat for improper location.
2. Airow may be insufcient. Check and clean the
lter, or placement of furniture or other articles that
may cause restrictions such as drapes, etc.
3. The reversing valve may be defective, creating a
bypass of refrigerant. If the unit will not heat, check
the reversing valve coil.
4. Check capillary tubes for possible restriction of
refrigerant ow.
5. Check for restriction in water ow.
Insufcient water ow through
condenser:
1. Check to see that valves are open all the way.
2. Check for air in lines.
3. Check circulating pump.
Water drips from conditioner:
1. Check for plugged condensate drain.
2. Check for dirty lter.
3. Check to see if condensate drain runs uphill.
4. See if blower motor is up to speed.
5. Check for loose or mispositioned blower.
6. Are drains properly trapped?
Noisy unit operation:
1. Check for fan wheel hitting the housing. Adjust for
clearance.
2. Check for bent fan wheel. Replace if damaged.
3. Check for loose fan wheel on shaft. Tighten.
4. Make sure compressor is oating free on its isolator
mounts.
5. Check for tubing touching compressor or other
surface. Readjust tubing by bending slightly.
6. Check screws on all panels. Tighten.
7. Check for chattering or humming in the contactor
relays due to low voltage or a defective holding coil.
Replace component.
8. Check water balance to unit for proper water ow rate.
IM 447-11 24 www.DaikinApplied.com
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