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18

Unit cools when heat 

is called for

Incorrect wiring

Refer to applicable wiring diagram

Defective solenoid coil

Check for continuity of coil

Reversing valve fails to shift

Block condenser coil & switch unit to cooling. Allow 
pressure to build up in system, then switch to 
heating. If valve fails to shift, replace valve.

Inoperative system switch

Check for continuity of system switch

Cooling adequate, 

but heating 

insuffi cient

Heating capillary tube partially restricted

Check for partially starved outer coil. Replace 
heating capillary tube

Check valve leaking internally

Switch unit several times from heating to cooling. 
Check temperature rise across coil. Refer to 
specifi cation sheet for correct temperature rise

Reversing valve failing to shift completely; 
bypassing hot gas

De-energize solenoid coil, raise head pressure, 
energize solenoid to break loose. If valve fails to 
make complete shift, replace valve.

Heat / Cool Room Air Conditioners: Troubleshooting Tips