Emerson 2 User Manual

Unit will not start

No power to unit

Check voltage to input circuit breaker.

Control voltage circuit 

breaker open

Locate short and reset breaker.

Shut off by external 

thermostat or stat is 

defective

Check operation of thermostat.

No cooling

Low refrigerant 

charge

Check with gauges.

Compressor contactor 

not pulling in

Check voltage at contactor. If not present refer to print and determine 

voltage loss. Check enthalpy sensor for full CCW or D setting.

No output from 

thermostat

Check operation of stat. Should have voltage output to Y terminal during 

cooling.

Unit cycles on

high pressure switch

Loss or restriction of 

air flow

Check condenser blower assembly for proper operation. Check for dirty 

coil or inlet grille restriction.

Defective fan cycling 

control

Switch should make @ 240 PSIG 

±10 (1655 kPa ±68.9). (Check settings 

on adjustable switch when supplied.)

Heat does not operate

No voltage output 

from thermostat

Check stat for proper output to W terminal.

Fuseable link blown

Check for open and replace.

Bad contactor

Check for open and replace.