Tecumseh AH5540E - Page 55

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Step 1: Before Continuing Troubleshooting…
WARNING! Allelectricpowershouldbedisconnectedandyoushouldhavealreadymade
surethatthecompressordoesnothaveagroundfault(see“CheckingforaGroundFault”
onpages40-41).You should have also checked the windings for continuity and proper
resistance (see “Checking for Continuity and Proper Resistance” on page 42), made sure
the system is getting proper voltage, and that the control, thermostat, and contactor are
working properly.
Step 2: Disconnect Fan Motor or Any Other Devices
If there is a fan motor or any other auxiliary device, open the circuit for the fan motor or any
other device.
Step 3: Check Wired-in PTC Relay
Check the relay by measuring continuity between the pin holes where the R and S pins on
the compressor are inserted. If there is no continuity, the relay may be open. Wait 3 min-
utes, then check continuity again. If there is still no continuity, replace the relay.
Step 4: Check External Thermal Protector
Check for continuity across the thermal protector (line 1 and compressor terminal con-
nection). If there is no continuity then the thermal protector may be tripped. Wait for the
protector to cool off and close. This may take more than an hour. Check continuity gain.
If there is no continuity, replace the protector.
Step 5: Continue Troubleshooting
If all above tests prove satisfactory and unit still fails to operate properly check for adequate
compressor pumping as outlined in the procedure on page 70.