GE GEH Series Service Manual page 111

The control monitors the following activities for faults:
- T4 rises at least 20°F during first 30 minutes of compressor run
- T4 is greater than 120°F after first 30 minutes of compressor run
- T3a is greater than 20°F after first 30 minutes of compressor run
- Difference between T3a and T3b is greater than 5°F after 30 minutes
- T4 temperature never exceeds 240°F while compressor is operating
- Both fans operate correctly
- Compressor draws more than 1.5 amps
- Upper element draws more than 10 amps
- Lower element draws more than 10 amps
- Filter is clean
- T3a, T3b, T4 and T5 sensors are within limits
- Keypad doesn't have any stuck keys
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