Tecumseh AH5540E Service Handbook page 53

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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 with 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.
Step 4: Check Current Relay
Keep the relay upright. Check the relay by measuring continuity between:
Relay terminals 1 (or L) and S. If there is continuity, then the contacts are closed when they
should be open. Replace the current relay.
Relay terminals 1 (or L) and M. If there is no continuity, replace the current relay.
Step 5: Replace Current Relay
If all above tests prove satisfactory, there is no capillary restriction, and the unit still fails to
operate properly, replace the relay. The new relay will eliminate any electrical problems
which cannot be determine with the above tests.
Step 6: Continue Troubleshooting
If the new relay does not correct the problem, check for adequate compressor pumping as
outlined in the procedure on page 70.