Tecumseh AH5540E Service Handbook page 57

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Step 1: Before Continuing with 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 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.
For GE modules, replace the entire starting and protector package.
For TI (Sensata) modules, replace the thermal protector.
Step 4: Check Module PTC Relay
Check the relay be measuring continuity between the starting and protector package 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 minutes, then check continuity again. If there is still no continu-
ity, replace the protector package.
Step 5: Continue Troubleshooting
If all above tests prove satisfactory and unit still fails to operate properly, check for ad-
equate compressor pumping as outlined in the procedure on page 70.