HEAT PUMP TROUBLESHOOTING
Problem | Possible Cause | Possible Solution | |
| Incorrect wiring | Refer to applicable wiring diagram | |
| Defective solenoid coil | Check for continuity of coil | |
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| Block condenser coil & switch unit to cooling. | |
Unit cools when | Reversing valve fails to shift | Allow pressure to build up in system, then | |
switch to heating. If valve fails to shift, replace | |||
heat is called for |
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| valve. | ||
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| Defective electronic control board | Replace electronic control board | |
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Problem | Possible Cause | Possible Solution | |
| Heating capillary tube partially | Check for partially starved outer coil. Replace | |
| restricted | heating capillary tube | |
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| Switch unit several times from heating to | |
Heating | Check valve leaking internally | cooling. Check temperature rise across | |
insufficient | coil. Refer to specifi cation sheet for correct | ||
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| temperature rise | |
| Reversing valve failing to shift | Deenergize solenoid coil, raise head pressure, | |
| energize solenoid to break loose. If valve fails | ||
| completely; bypassing hot gas | ||
| to make complete shift, replace valve. | ||
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