Problem | Possible Cause | Action | |
| Incorrect wiring | Refer to applicable wiring diagram | |
| Defective solenoid coil | Check for continuity of coil | |
Unit cools when |
| Block condenser coil & switch unit to cooling. | |
| Allow pressure to build up in system, then | ||
heat is called for | Reversing valve fails to shift | ||
switch to heating. If valve fails to shift, replace | |||
|
| ||
|
| valve. | |
| Inoperative system switch | Check for continuity of system switch |
Problem | Possible Cause | Action | |
| Heating capillary tube partially | Check for partially starved outer coil. Replace | |
| restricted | heating capillary tube | |
|
| Switch unit several times from heating to | |
Cooling adequate, | Check valve leaking internally | cooling. Check temperature rise across | |
but heating | coil. Refer to specification sheet for correct | ||
| |||
insufficient |
| 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. | ||
|
|
20
