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All installations and services must be performed by qualified service personnel.
Notes for Air Conditioning Troubleshooting Guide
1.101.0 Check to see if the contactor has not pulled in. If the coil has not pulled in the
contactor, check for 24 VAC to the coil on the contactor.
1.101.1 Check to make sure the control transformer is powering the 115 VAC circuit.
1.101.2 Check for 115 VAC to the control transformer. Check control fuse for 115 VAC
supply.
1.101.3 Check to see if the thermostat is closing to complete the 24 VAC circuit.
Remove thermostat and jump terminals R-Y and R-G. If jumping the sub-base
works, replace thermostat.
1.101.4 If the contactor is reading 24 VAC on the coil, but is not pulling in the contactor,
replace the contactor.
1.101.5 Check the entire 24 VAC circuit between the thermostat, fan control, and
contactor for loose connections and wires pulled away from terminations or
terminals. These conditions can cause an open circuit.
1.101.6 Check for 24 VAC across the refrigerant high-pressure switch. If 24 VAC is
present, check for high liquid pressure or broken wires.
1.201.0 If the contactor is closed and line voltage is measured across lines L1 and L2
but the unit does not run, proceed with the following checks.
1.201.1 Check 240-volt wire leads to the capacitors and the compressor. Make sure
the terminals on the compressor and capacitors are not touching or loose.
1.201.2 Check for continuity across the three terminals of the compressor. (If
continuity is not measured, the compressor windings are opened.)
1.201.3 Check for grounded compressor windings by checking continuity to ground.
1.201.4 The compressor may be tapped with a rubber mallet, or piece of wood, to jar
the compressor loose.
1.201.5 Allow the compressor to cool below 130
°F. Check for continuity between
terminals S and C on the compressor. If you do not have continuity, the thermal
protector may require more time to cool down.
1.201.6 Check capacitance of the run capacitor.
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